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Thread: Handmade Passive Preamplifier
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November 11, 2020, 10:15 PM #1
Handmade Passive Preamplifier
My very first handmade passive preamp!
Lots of fun to make it successfully amplifying and tuning sound quality in thick bass or accurate positioning Hope to share with all of you.
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November 11, 2020, 10:19 PM #2
Re: Handmade Passive Preamplifier
Welcome and really nice work.
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Brian
Main System - Rotel RCD-1572 / Rega P3 > Luxman 505UX Mark II > Fyne Audio F502SPs > Synergistic Cables
Secondary - OPPO 93 > VAC CLA 1 MKII Pre > Odyssey Stratos > Dynaudio Audience 82s > Tara Labs Cables
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November 11, 2020, 10:43 PM #3
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Re: Handmade Passive Preamplifier
Looks great, well done.
How does it sound?My System
Acoustic Revive RTP-4
Innuos Pulsar
Lampizator BALTIC4
Cary SLP-05
Pass XA30.5 or
Line Magnetic 845ia
Reference 3A Reflector's
Pr SVS SB3000 Subs
Cables & Tubes "subject to change without notification".
Complete system on battery power/solar
Core Audio Design Rack
DIY bass traps and custom curved diffusors.
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November 12, 2020, 05:48 AM #4
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November 12, 2020, 05:48 AM #5
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November 12, 2020, 05:53 AM #6
Re: Handmade Passive Preamplifier
In fact, hope to know whether there are anymore similar types of passive preamp. Wanna try and improve my work.
Does anyone know?
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November 12, 2020, 08:17 AM #7
Re: Handmade Passive Preamplifier
Well done and thank you for joining!
Fleetwood Deville by Oswald Mills Audio, Vienna Acoustics Haydn Jubilee, Wharfedale Linton w/ stands, Klipsch RB-75, Klipsch RP-160M.
Job INTegrated. Luxman L-595aSE
NAD C 658 streamer.
First Watt SIT-3, Job 250 Monos, NuForce STA200, AkitikA GT-102 amp, ASL Wave monos, Dennis Had 45 monos. Absolute Audio Labs PCF 25 amp (improved First Watt F7 super clone)
Topping D90, RME Audio ADI-2 DAC FS, ModWright Ultimate Sony XA-5400ES.
Burmester 948, McIntosh MCLK12, Kimber Kable, Siltech, Cardas, Avanti Audio cables.
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November 12, 2020, 09:15 AM #8
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Re: Handmade Passive Preamplifier
I don't even begin to understand the schematic.
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November 12, 2020, 11:35 AM #9
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Re: Handmade Passive Preamplifier
In fact, hope to know whether there are anymore similar types of passive preamp. Wanna try and improve my work. Does anyone know?
Very clear, airy sound, but I get more dynamic impact with the regular active pre.
Beautifully done, by the way!Music library: c. 4.5T digital, c.3.5k LPs & CDs
Digital source: Optimised Mini X -- Musichi player external linear PS; DAC: (MSB Select II), Ideon Audio Ayazi II, 2x Ideon 3R Master Time signal reclocking external linear PS; Analogue source: TT: (S-Yorke S7/ S-Yorke S4 - Pluto 6) / Pro ject Xtension 12'΄; Active pre: Borbely Reference; Passive pre: Stevens & Billington; Amp: Symphonic Line Kraft; Speaker sstm: Devore / ProAc / SUBs: SVS Cabling: Bearlabs, Nordost Valhalla, bespoke; Isolation: bespoke rack with hanging shelves, Neuance shelves, Nordost pulsar points, various cones (metal, ceramic, etc);
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November 12, 2020, 09:15 PM #10
Re: Handmade Passive Preamplifier
Awesome job...
Arek Kallas offers an attenuator that is rated as one of the best and I know they are highly rated in the DIY community. Khozma Acoustic is his company where these are sold.
High Quality Audio & Industrial Attenuators and Passive Preamplifiers
I do not believe he offers full kits however.
His higher level company is Hattor Audio. In my personal view they offer one of the finest passive pre-amplifiers on the market.
Hattor Audio
I really like my Hattor pre-amp and I have the addon Tube Active Stage on order, which will make my Hattor a true three box pre-amp!McIntosh C49, MC152, MR85, R778 | T+A DAC 8 DSD | KEF LS50 Meta w/S2, KC62 (x2) | Rega RP8, Ania Pro, NEO PSU | Technics SL-1500C | Audio Technica VM750ML | Hexmat Eclipse, Yellow Bird, Molekula, Molekula Mini | Pro-Ject VC-E | Falcon NW PC Server (Roon Core & HQPlayer) | Microsoft Surface Pro 6 (Roon Controller) | Wyred 4 Sound ISO Recovery, DC Recovery | Abyss Diana Phi | Schiit Jotunheim 2 | Astell&Kern SE200 | Oppo BDP105
“One of the great challenges in life is knowing enough to think you're right but not enough to know you're wrong”
"You can't use reason to convince anyone out of an argument that they didn't use reason to get into"
― Neil deGrasse Tyson
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November 13, 2020, 11:42 PM #11
Re: Handmade Passive Preamplifier
I could tell you more if you want to
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November 14, 2020, 01:08 AM #12
Re: Handmade Passive Preamplifier
Since you guys are talking about the attenuators, I might share more about the attenuator and transformer I used in this DIY passive preamp.
The attenuator and transformer are handcrafted and bought from "design by mr.k", a local brand from my hometown Hong Kong.
I've tried other attenuators and transformers from other brand before, sadly they didn't work/sound good. But for "design by mr.k", I could find 59 steps mechanical volume control and even 59 steps autotransformer - I think it might be probably the largest number of steps I've ever seen before. This transformer controls the volume step-up amplifying, that's why this passive preamp doesn't require any power sources.
This brand also offers the whole set of passive preamp product on eBay. Not sure whether you guys would be interested, but just hope to share my experience and some reviews
Very sorry that up to this moment I could not post up any links yet(since I'm new and don't have enough post counts). Once I could, I will post up the company and eBay link to you all.
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November 14, 2020, 02:06 AM #13
Re: Handmade Passive Preamplifier
McIntosh C49, MC152, MR85, R778 | T+A DAC 8 DSD | KEF LS50 Meta w/S2, KC62 (x2) | Rega RP8, Ania Pro, NEO PSU | Technics SL-1500C | Audio Technica VM750ML | Hexmat Eclipse, Yellow Bird, Molekula, Molekula Mini | Pro-Ject VC-E | Falcon NW PC Server (Roon Core & HQPlayer) | Microsoft Surface Pro 6 (Roon Controller) | Wyred 4 Sound ISO Recovery, DC Recovery | Abyss Diana Phi | Schiit Jotunheim 2 | Astell&Kern SE200 | Oppo BDP105
“One of the great challenges in life is knowing enough to think you're right but not enough to know you're wrong”
"You can't use reason to convince anyone out of an argument that they didn't use reason to get into"
― Neil deGrasse Tyson
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November 16, 2020, 12:20 AM #14
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November 16, 2020, 12:45 AM #15
Re: Handmade Passive Preamplifier
That is cool. Of course you should use whichever is best for your purposes.
Arek's attenuators are highly regarded as about the purest sounding available. I can tell you from comparing several preamplifiers, the Hattor is the best sounding I have ever heard, and is ranked with the best of the best passive preamplifiers anywhere in the world.
One huge difference however is that Arek offers an optional top quality Active Gain Stage. Mine should be arriving some time this week. It can be used as pure passive or with a selectable level of gain, and some added tube goodness! The full three box preamplifier supposable can hold its own against many of the very highest preamps!McIntosh C49, MC152, MR85, R778 | T+A DAC 8 DSD | KEF LS50 Meta w/S2, KC62 (x2) | Rega RP8, Ania Pro, NEO PSU | Technics SL-1500C | Audio Technica VM750ML | Hexmat Eclipse, Yellow Bird, Molekula, Molekula Mini | Pro-Ject VC-E | Falcon NW PC Server (Roon Core & HQPlayer) | Microsoft Surface Pro 6 (Roon Controller) | Wyred 4 Sound ISO Recovery, DC Recovery | Abyss Diana Phi | Schiit Jotunheim 2 | Astell&Kern SE200 | Oppo BDP105
“One of the great challenges in life is knowing enough to think you're right but not enough to know you're wrong”
"You can't use reason to convince anyone out of an argument that they didn't use reason to get into"
― Neil deGrasse Tyson
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November 16, 2020, 06:13 AM #16
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November 16, 2020, 06:22 AM #17
Re: Handmade Passive Preamplifier
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November 16, 2020, 08:57 AM #18
Re: Handmade Passive Preamplifier
The base unit is a pure passive preamplifier. He offers a few different levels of resistors to choose from (with added cost of course). I originally purchased the base vishay version and it was very good. I then stepped up to the AMRG Trans version, his finest. It was considerably more open, more lush sounding. More air around the instruments, simply inviting and musical sounding.
The Tube Active Stage unit has not arrived yet. Therefore I can not answer that yet. I know the unit has a switch between pure passive mode which should be nice for lower listening, late night sessions, etc. When switching in the active mode there is another switch for how much gain. Arek states that with the active stage the sound is more relaxed, more dynamic with deeper bass. Because I am using harder to drive speakers, 4 ohm and 86 dB efficiency, and I am also preferring my amplifier that is very sweet sounding and musical but lower power, this extra dynamics should be useful.McIntosh C49, MC152, MR85, R778 | T+A DAC 8 DSD | KEF LS50 Meta w/S2, KC62 (x2) | Rega RP8, Ania Pro, NEO PSU | Technics SL-1500C | Audio Technica VM750ML | Hexmat Eclipse, Yellow Bird, Molekula, Molekula Mini | Pro-Ject VC-E | Falcon NW PC Server (Roon Core & HQPlayer) | Microsoft Surface Pro 6 (Roon Controller) | Wyred 4 Sound ISO Recovery, DC Recovery | Abyss Diana Phi | Schiit Jotunheim 2 | Astell&Kern SE200 | Oppo BDP105
“One of the great challenges in life is knowing enough to think you're right but not enough to know you're wrong”
"You can't use reason to convince anyone out of an argument that they didn't use reason to get into"
― Neil deGrasse Tyson
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November 16, 2020, 01:36 PM #19
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- Mar 2018
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- 435
Re: Handmade Passive Preamplifier
Very nice work! I bought a 64 step volume control years ago with the intent of building something similar. I got lazy and never attempted it. My first passive pre was a Mod Squad Line Drive, it replaced a Carver preamp that had a power supply about the size of your thumb. That Line Drive blew me away and played many years of pretty music for me. Congrats.
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November 16, 2020, 11:33 PM #20
Re: Handmade Passive Preamplifier
Thank you so much! I think the 64 steps one you bought should be electronic switches with relays, but here we use mechanical switch for concrete volume control experience which is great for HiFi lovers. In fact, you may start trying to build your second passive preamp without any power supply. The attenuator and transformer I bought is from DesignbyMr.K, which also offers the whole kit of passive premaplifier from eBay, has no any power sources applied in the design. As there is no any active components, power lines or supply nor wall plugs needed, no noise and distortion added to the device even up to 10X gain option. If you're looking for a no power passive preamp option, I would recommend DesignbyMr.K to you.
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November 18, 2020, 02:08 AM #21
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Re: Handmade Passive Preamplifier
Looks great. Without a remote, it becomes difficult for practical purpose, especially for folks who are streaming digital from the comfort of their listening chair
I am big fan of Chapman's autofomer. It really brings out the weakness/greatness of your frontend.
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November 18, 2020, 09:56 AM #22
Re: Handmade Passive Preamplifier
Source Analog: Kuzma Stabi R w/4point 11 arm | Kuzma 50 Cartridge
Source Digital: Aurender N10 | Brinkmann Nyquist MK II
Amplification: Dan D’Agostino Momentum HD and M400’s | Boulder 508
Speakers: Wilson Alexias
Cabling: Nordost Leif, Norse, V2 and Odin
Power and Isolation: Audio-Ultra Home & Room Power Foundation Performance Package with StromTank S1000 | HRS
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November 18, 2020, 10:05 AM #23
Re: Handmade Passive Preamplifier
Another question I have. How do you select between the different inputs or do you manual switch the cables? I could be missing it but I only see a volume control on the unit. Am I missing something?
McIntosh C49, MC152, MR85, R778 | T+A DAC 8 DSD | KEF LS50 Meta w/S2, KC62 (x2) | Rega RP8, Ania Pro, NEO PSU | Technics SL-1500C | Audio Technica VM750ML | Hexmat Eclipse, Yellow Bird, Molekula, Molekula Mini | Pro-Ject VC-E | Falcon NW PC Server (Roon Core & HQPlayer) | Microsoft Surface Pro 6 (Roon Controller) | Wyred 4 Sound ISO Recovery, DC Recovery | Abyss Diana Phi | Schiit Jotunheim 2 | Astell&Kern SE200 | Oppo BDP105
“One of the great challenges in life is knowing enough to think you're right but not enough to know you're wrong”
"You can't use reason to convince anyone out of an argument that they didn't use reason to get into"
― Neil deGrasse Tyson
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November 19, 2020, 10:51 PM #24
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November 19, 2020, 11:30 PM #25
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November 19, 2020, 11:33 PM #26
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November 21, 2020, 12:29 PM #27
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Re: Handmade Passive Preamplifier
I only used one input on my Line Drive ( cd player ) so I bypassed the selector switch. My passive would have been the same as your "X1" setting. We controlled the sound by using putty to dampen the inside of the chassis. Again, very nice work.
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November 21, 2020, 12:40 PM #28
Re: Handmade Passive Preamplifier
So in essence it is simply a volume control. That is cool. Gives you what you need.
I have four sources hooked to my Hattor. Three use XLR and one RCA. Two of these I use on a daily basis so having input switching is fairly important to me on my passive pre.McIntosh C49, MC152, MR85, R778 | T+A DAC 8 DSD | KEF LS50 Meta w/S2, KC62 (x2) | Rega RP8, Ania Pro, NEO PSU | Technics SL-1500C | Audio Technica VM750ML | Hexmat Eclipse, Yellow Bird, Molekula, Molekula Mini | Pro-Ject VC-E | Falcon NW PC Server (Roon Core & HQPlayer) | Microsoft Surface Pro 6 (Roon Controller) | Wyred 4 Sound ISO Recovery, DC Recovery | Abyss Diana Phi | Schiit Jotunheim 2 | Astell&Kern SE200 | Oppo BDP105
“One of the great challenges in life is knowing enough to think you're right but not enough to know you're wrong”
"You can't use reason to convince anyone out of an argument that they didn't use reason to get into"
― Neil deGrasse Tyson
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November 21, 2020, 01:36 PM #29
Re: Handmade Passive Preamplifier
Peter Daniel of Audiosector used to produce the AudioZone Pre-T1 which featured Stevens & Billington xfmers, arguably the best of their kind. Peter has an eye for form as well as function and his products all sound wonderful. There is no free lunch with these types of devices as impedance changes with each volume step and can wreak havoc with capacitive cables and accompanying gear with high output/low input impedances.
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November 21, 2020, 08:50 PM #30
Re: Handmade Passive Preamplifier
Looks interesting.
McIntosh C49, MC152, MR85, R778 | T+A DAC 8 DSD | KEF LS50 Meta w/S2, KC62 (x2) | Rega RP8, Ania Pro, NEO PSU | Technics SL-1500C | Audio Technica VM750ML | Hexmat Eclipse, Yellow Bird, Molekula, Molekula Mini | Pro-Ject VC-E | Falcon NW PC Server (Roon Core & HQPlayer) | Microsoft Surface Pro 6 (Roon Controller) | Wyred 4 Sound ISO Recovery, DC Recovery | Abyss Diana Phi | Schiit Jotunheim 2 | Astell&Kern SE200 | Oppo BDP105
“One of the great challenges in life is knowing enough to think you're right but not enough to know you're wrong”
"You can't use reason to convince anyone out of an argument that they didn't use reason to get into"
― Neil deGrasse Tyson
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November 22, 2020, 10:32 PM #31
Re: Handmade Passive Preamplifier
Thanks for your appreciation! I got four gain options here, from 1X up to 10X(+20dB) for sound quality controlling. Here you see only RCA switching is available for gain selections, however I could actually make a selector switch. It definitely could be a way more than that! But the sound, still, available from accurate positioning to sweet to super thick by selecting 1X, 3X, 5X and 10X gain.
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November 22, 2020, 10:38 PM #32
Re: Handmade Passive Preamplifier
This is a passive preamplifier but not a volume control.....
A 59 steps autotransformer is used for voltage amplifying. Magnetic force is induced throughout this C Core transformer, with 1X, 3X, 5X and 10X gain options, sound qualities could vary from sweet to thick bass to super thick...You could see the gain options plugs on the back panel from the image. There is no need to use any power sources, meaning no active components or power line/supplies or wall plug are used, so no noise and distortion will be added to the passive preamp. Plus, a 59 steps mechanical volume switch is used(really not an electronic one!) which makes me feel concrete and great during tuning!
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November 22, 2020, 10:41 PM #33
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November 22, 2020, 10:43 PM #34
Re: Handmade Passive Preamplifier
Since you guys may not have a fully understanding about this passive preamp work, just feel free to discuss with me about it, especially for its core part (the attenuator and transformer) used here
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November 22, 2020, 10:55 PM #35
Re: Handmade Passive Preamplifier
I know exactly what it is, I was a Sonic Euphoria PLC beta tester for Jeff Hagler of Sound Values back in the mid 90s before he ever brought it to market. I will say it again, PLCs are not a free lunch they will impact frequency response based on the 'gain' setting which is a misnomer since they are really nothing more than an attenuator. Here's a pic of the old girl, look familiar? (balanced vers)
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November 23, 2020, 05:45 AM #36
Re: Handmade Passive Preamplifier
Yes and that's a very similar design to mine! Yours also got the gain and volume selections right? But I think it should be only up to 24 steps for both mechanical volume control and transformer right?The only brand I know that could reach to more steps is this 59 steps one from designbymrk. I don't mean that 64 steps one as it is designed as an electronic switch but not a mechanical one.
Has anybody checked out this Hong Kong brand website? I really recommend its design and that's why I used it in my work.
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November 23, 2020, 09:05 AM #37
Re: Handmade Passive Preamplifier
I of course understand what a passive pre-amp is, I currently use one and have had others. However, when you state that it adds gain, guess what, it is no longer a passive pre-amp. Any kind of gain stage makes it into a standard active pre-amp and no longer a passive. If you are using it without gain you are using it passive.
To quote Arek Kallas, one of the true expert designers in the field, offering some of the best passive pre-amps and attenuators in the world, when you add a gain stage, "In fact it will be an active preamp".
Further more, to add gain does require some type of power. It can't add gain (amplification) without it. So in passive mode it is basically an attenuator and to add gain requires some kind of power (it cannot get louder without a power source). Therefore what is being referred to as gain is in fact more attenuation. With a pure passive, at no attenuation the full input signal is being passed to the amplifier, attenuation actually cuts this signal back to control the volume you hear. Usually with some type of resistors put in line. Less volume equates to larger attenuation resistors. The volume control actually moves different resistors in and out of line with the source signal.
To summarize, you cannot add gain (amplification) without power and adding true gain in fact changes the pre-amp to an active pre-amp, no longer a passive. This has been fully described to me by two of the foremost experts in the field; Arek Kallas, owner of Hattor Audio and Khozma Acoustic and my personal friend EJ Sarmento, owner of Wyred 4 Sound (designer and builder of the world renowned STP-SE Stage 2), SST, Carver and others.McIntosh C49, MC152, MR85, R778 | T+A DAC 8 DSD | KEF LS50 Meta w/S2, KC62 (x2) | Rega RP8, Ania Pro, NEO PSU | Technics SL-1500C | Audio Technica VM750ML | Hexmat Eclipse, Yellow Bird, Molekula, Molekula Mini | Pro-Ject VC-E | Falcon NW PC Server (Roon Core & HQPlayer) | Microsoft Surface Pro 6 (Roon Controller) | Wyred 4 Sound ISO Recovery, DC Recovery | Abyss Diana Phi | Schiit Jotunheim 2 | Astell&Kern SE200 | Oppo BDP105
“One of the great challenges in life is knowing enough to think you're right but not enough to know you're wrong”
"You can't use reason to convince anyone out of an argument that they didn't use reason to get into"
― Neil deGrasse Tyson
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November 23, 2020, 09:08 AM #38
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Re: Handmade Passive Preamplifier
I thought that the schematic in post #1 looked strange.
It seems that the unit is not a passive pre-amp, that is an input selector and volume control. But rather it's a euphoric effects generator.
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November 23, 2020, 04:03 PM #39
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Re: Handmade Passive Preamplifier
Now I don't have any problems with the unit, it looks great!
The problem I have is calling it a pre-amp.
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November 23, 2020, 04:12 PM #40
Re: Handmade Passive Preamplifier
Again, I agree. It looks like a nice unit but it certainly is not a passive pre-amp.
"successfully amplifying and tuning sound quality", and "with 1X, 3X, 5X and 10X gain options", I also have an issue with this, it cannot amplify the sound without a power source. Passive pre-amps attenuate the sound by putting various resistors in the signal path. Adding "gain" amplifies the signal and this requires a power source, and also would make it not be a passive pre-amp. Maybe he is confusing a lesser amount of attenuation as being gain?
"This is a passive preamplifier but not a volume control", excuse me.... to be a passive pre-amp it has to be a volume control... that is exactly what attenuation does.
"Plus, a 59 steps mechanical volume switch is used", ok, so now I am very confused, not a volume control and a couple sentences later 59 step mechanical volume switch is used??? Huh?
"Since you guys may not have a fully understanding about this passive preamp work, just feel free to discuss with me about it", ahhh yea, I think we do.McIntosh C49, MC152, MR85, R778 | T+A DAC 8 DSD | KEF LS50 Meta w/S2, KC62 (x2) | Rega RP8, Ania Pro, NEO PSU | Technics SL-1500C | Audio Technica VM750ML | Hexmat Eclipse, Yellow Bird, Molekula, Molekula Mini | Pro-Ject VC-E | Falcon NW PC Server (Roon Core & HQPlayer) | Microsoft Surface Pro 6 (Roon Controller) | Wyred 4 Sound ISO Recovery, DC Recovery | Abyss Diana Phi | Schiit Jotunheim 2 | Astell&Kern SE200 | Oppo BDP105
“One of the great challenges in life is knowing enough to think you're right but not enough to know you're wrong”
"You can't use reason to convince anyone out of an argument that they didn't use reason to get into"
― Neil deGrasse Tyson
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November 24, 2020, 02:52 AM #41
Re: Handmade Passive Preamplifier
First of all, if we talk about the gain, I would like to stress that the gain mentioned in my work is VOLTAGE gain but not power gain. We have definitions to define whether this is active or passive. To quote, "A passive component, depending on field, may be either a component that consumes but does not produce energy (thermodynamic passivity) or a component that is incapable of power gain (incremental passivity).", see on wikipedia. No active component involved. This is definitely a passive preamplifier.
Adding power gain does require power, while adding voltage or current gain might not. We could do energy transfer to add voltage or current gain without power, one of the examples is phono MC transformer preamplifier. It added voltage gain by using a MC transformer to do energy transfer, which does not require power. This is exactly what the case in my work.
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November 24, 2020, 02:58 AM #42
Re: Handmade Passive Preamplifier
To be more accurate, I would say that this is a passive preamplifier with input selector and volume control. For the reasons, see my previous comments:
"We have definitions to define whether this is active or passive. To quote, "A passive component, depending on field, may be either a component that consumes but does not produce energy (thermodynamic passivity) or a component that is incapable of power gain (incremental passivity).", see on wikipedia. No active component involved. This is definitely a passive preamplifier."
Have you ever seen a euphoric effects generator could obtain voltage gain selections from 1X, 3X, 5X to 10X?
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November 24, 2020, 03:08 AM #43
Re: Handmade Passive Preamplifier
I think I've explained this part. We can amplify without a power source, if we talk about VOLTAGE amplifying.
This is a passive preamplifier with 59 steps mechanical volume control, but not either one, to be a more accurate speaking.
With 1V input, we have 10V output. With 0.1V input, we have 1V output. This is the fact. How could you say that this is not the case, huh?
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November 24, 2020, 09:02 AM #44
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Re: Handmade Passive Preamplifier
Yes a transformer can increase output voltage, but at the cost of lowering it's input impedance. There are no free lunches with transformers.
Not sure that lower impedance's are a good idea with passive components.
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November 24, 2020, 09:23 AM #45
Re: Handmade Passive Preamplifier
Also, we are talking about the accepted terms in the audio world. A preamplifier controls volume output to an amplifier and selects inputs from music sources. A passive preamplifier does not add any gain but instead passes the signal through and controls volume more often then not by utilizing some sort of inline resistors to attenuate the signal.
When I added the tube stage to my preamplifier yesterday it was no longer a passive preamp but instead became an active pre. I can actually selected which manner I would like to run it, either passive or active from a switch on the front panel. To add gain/amplification to the signal does indeed require a power source.
The device you built, which looks interesting and appears that you did a good job on it, does not seem to be a passive preamplifier as the terms are used in the audio world. There is not input selection, but instead you can switch connected sources to change the voltages (as you described it) which of course does change the impedance.
Cool looking device but certainly not what I would refer to as a passive preamplifier.McIntosh C49, MC152, MR85, R778 | T+A DAC 8 DSD | KEF LS50 Meta w/S2, KC62 (x2) | Rega RP8, Ania Pro, NEO PSU | Technics SL-1500C | Audio Technica VM750ML | Hexmat Eclipse, Yellow Bird, Molekula, Molekula Mini | Pro-Ject VC-E | Falcon NW PC Server (Roon Core & HQPlayer) | Microsoft Surface Pro 6 (Roon Controller) | Wyred 4 Sound ISO Recovery, DC Recovery | Abyss Diana Phi | Schiit Jotunheim 2 | Astell&Kern SE200 | Oppo BDP105
“One of the great challenges in life is knowing enough to think you're right but not enough to know you're wrong”
"You can't use reason to convince anyone out of an argument that they didn't use reason to get into"
― Neil deGrasse Tyson
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November 24, 2020, 11:18 PM #46
Re: Handmade Passive Preamplifier
First of all, those accepted terms you stated are lack of concrete evidence, at least I don't agree. For mine is supported by the Wikipedia, which is accepted by the worldwide.
Secondly, when we input 0.2V would output 2V(10 times gain, +20dB). That's why I called it an amplifier.
Thirdly, our preamp does not require any power sources and uses all passive components. That's why I called it a passive preamp.
Fourthly, all preamp are with volume. So according to your theory, all preamp should be called as volume right?
Finally, what you previously argued so far is meaningless.
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November 24, 2020, 11:20 PM #47
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November 24, 2020, 11:28 PM #48
Re: Handmade Passive Preamplifier
Hmmmm.....
Wikipedia is not an authoritative source and you do know you are posting on an Audio Forum where we discuss things in audio terms, right?
An amplifier amplifies the audio signal and does not simply play with voltage.
You can't really call it a preamp if if does not have an input source selector and a volume control can you?
That is just plain putting words in my mouth. No one said a preamp should be called volume, however a volume control is a major function of any preamplifier. Besides being wrong it is also extremely rude. I know you are not used to a forum like Audio Shark where people are friendly and treat others respectfully, but that is how we operate here.
And again another rude statement.
And there you have it. A shill for a company trying to drum up business.
Just give it up please...Your arguments makes no sense and it just goes round and round. With each post you are sounding less and less credible so please just stop.
Definitely have had enough of this thread.McIntosh C49, MC152, MR85, R778 | T+A DAC 8 DSD | KEF LS50 Meta w/S2, KC62 (x2) | Rega RP8, Ania Pro, NEO PSU | Technics SL-1500C | Audio Technica VM750ML | Hexmat Eclipse, Yellow Bird, Molekula, Molekula Mini | Pro-Ject VC-E | Falcon NW PC Server (Roon Core & HQPlayer) | Microsoft Surface Pro 6 (Roon Controller) | Wyred 4 Sound ISO Recovery, DC Recovery | Abyss Diana Phi | Schiit Jotunheim 2 | Astell&Kern SE200 | Oppo BDP105
“One of the great challenges in life is knowing enough to think you're right but not enough to know you're wrong”
"You can't use reason to convince anyone out of an argument that they didn't use reason to get into"
― Neil deGrasse Tyson
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November 25, 2020, 09:02 AM #49
- Join Date
- May 2017
- Location
- Cleveland, Ohio, USA
- Posts
- 531
Re: Handmade Passive Preamplifier
Your unit has qualities that are almost opposite of the qualities desired by audiophiles that chose passive pre-amps.
Those audiophiles chose passive pre-amps because they feel that an active stage might change the signal in some small way.
Your unit intentionally changes the signal.
Why not call it "Not a Passive Pre-amp" ?
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November 25, 2020, 10:53 PM #50
Re: Handmade Passive Preamplifier
Wikipedia is monitored by many professional and discerning people, which is trustful. Otherwise what other platforms could you provide?
I'm talking about 20Hz - 20kHz audio signal from 0.2V to 2V. If I'm not talking about audio signal, what else could I refer to?
You're wrong again. So you're talking about those so-called "definitions" again right? We do have a volume control with 59 steps mechanical control. I intentionally not to put on the input selector as there is only need to use one sourcing which I aimed to ensure a more pure sound quality.
I couldn't feel how nice or friendly you've been so far. From time to time you keep on arguing what a preamplifier is, what means by active or passive...What I've received are those rude saying either, that's why I talk to you in this way. I agree that this forum is a place with many good people, but you might not be one of them.
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AudioShark forum is a leading forum site for High End Audio Discussion, Stereo System Discussion, Home Theater System Discussion, Best Home Stereo System Discussion, Home Theater Installation Discussion etc.
The AudioShark forum was created for sharing the passion of high-end Audio. We have Audiophiles from all over the world participating and sharing their knowledge. From novice to experts, you will find a friendly environment for discussing about High End Audio, Stereo System, Home Theater System, Home Stereo System, Home Theater Installation, Amplifiers, Speakers, Subwoofers, Integrated System, Acoustic treatments & Digital Room Corrections and many more.
At AudioShark, we also have incorporated an exciting Marketplace where members can peruse terrific buys on used gear, as well as meet dealers and discuss the purchase of new gear.
We are as crazy about this hobby as you are! So come on in and join us! Audioshark.org the Friendliest Audio Forum!
Industry Participation Disclosure : The owner and administrator of Audioshark is the owner of Suncoast Audio LLC in Sarasota Florida. Suncoast Audio has a full brick and mortar presence in Sarasota with several great show rooms with many world class brands. More information can be found at http://www.suncoastaudio.com
Audioshark is a community of like minded individuals. Audioshark welcomes participation from all manufacturers and owners of all brands and products. It is our belief that online forums provide a community of like minded audiophiles and music lovers to encourage the growth of this wonderful hobby.
Sincerely,
The Audioshark.org Team
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