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Thread: Preamp build
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November 30, 2015, 07:35 PM #1
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Preamp build
I am in the process of obtaining the parts to build a Pass Labs B1 preamp/buffer for my son to pair with his Parasound A21 amp.
I am using Mundorf Mcap Supremes and Clarity ESA's for caps (It was between the ESA's or Obbligoato Golds which have more air, transparency and detail but less bass). My budget for caps was $100. For resistors I am using Audio Note Tantalums, Riken Carbon (in the out put stage) and Takman Rey's along with Tx 2575's ( input stage). I am putting in a 100k Ohm Remote controlled Alps volume pot (I prefer a 50k Ohm but I cant find the Alps in a motorized version in that value). For a power supply I am going to start with a 24v wal-wart. My son wants a warmer, slightly colored darker sound.
I will try and post pic's as it progresses. It should be fun. If all goes well, I will tackle the the Pass Pearl B2 phono preamp.My Gear- Mains System-Pass X250 amp, BAT VK-51se preamp, Luxman DA-06 DAC, Magnepan 1.6's, Thorens TD-145 TT, Dual Martin Logan Subs, Vintage Luxman T-110 Tuner, Cables-WW Platinum 7 USB, Cardas Parsec XLR, AQ Columbia DBS 72v XLR, Belden 8402 XLR.
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November 30, 2015, 11:55 PM #2
Re: Preamp build
Will you post pictures as you go along?
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December 1, 2015, 12:49 AM #3
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Re: Preamp build
I sure will. I will start the build in about 2 weeks as I have to go to Indianapolis for a conference and I have to order a few more parts along with the Metal case, remote control volume pot and board which will come from from Hong Kong-
http://diyclub.biz/catalog/product_i...roducts_id=591
I am going with silver to match the A21 amp.My Gear- Mains System-Pass X250 amp, BAT VK-51se preamp, Luxman DA-06 DAC, Magnepan 1.6's, Thorens TD-145 TT, Dual Martin Logan Subs, Vintage Luxman T-110 Tuner, Cables-WW Platinum 7 USB, Cardas Parsec XLR, AQ Columbia DBS 72v XLR, Belden 8402 XLR.
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January 14, 2016, 01:14 AM #4
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Re: Preamp build
Here are pic's of my build. The preamp sounds great. Have had it done for about 2 weeks-
My Gear- Mains System-Pass X250 amp, BAT VK-51se preamp, Luxman DA-06 DAC, Magnepan 1.6's, Thorens TD-145 TT, Dual Martin Logan Subs, Vintage Luxman T-110 Tuner, Cables-WW Platinum 7 USB, Cardas Parsec XLR, AQ Columbia DBS 72v XLR, Belden 8402 XLR.
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January 14, 2016, 08:31 AM #5
Re: Preamp build
Nice job, Larry. Would love to hear it. Keep us updated on it's sound.
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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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January 14, 2016, 02:01 PM #6
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Re: Preamp build
Thanks, The wiring looks a little haphazard because the chassis that I bought was pre-drilled and it does not jive with the layout of the board.
Next up is to add a torroidal power transformer and swap out the volume pot for a remote controlled pot.
It sounds better than the Pass X1 preamp that I had which sold for $6K. It is much more musical with deeper bass and a more textured midrange. The mid range is where the money is on the B1. It is full, lush, smooth yet transparent and detailed at the same time. It has excellent air with a very wide and deep sound stage. Bass is powerful and there is a little bit of bloom. It leans just a hint on the warmer side of neutral which was by design with the caps and resistors used. I have about $300 invested in the B1.My Gear- Mains System-Pass X250 amp, BAT VK-51se preamp, Luxman DA-06 DAC, Magnepan 1.6's, Thorens TD-145 TT, Dual Martin Logan Subs, Vintage Luxman T-110 Tuner, Cables-WW Platinum 7 USB, Cardas Parsec XLR, AQ Columbia DBS 72v XLR, Belden 8402 XLR.
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February 2, 2016, 12:18 AM #7
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Re: Preamp build
The sound is really coming along as the hours pile up and the Mundorf and Clarity caps break in. I found an 18vdc external linear power supply for $100 here in the USA. I choose it over going with a torroidal because of the potential for RF or EMI with it. The Linear PS will be external. Next up is to add a 50kohm TKD volume pot with remote control pcb to replace the Alps Blue Velvet pot and to rewire things with twisted wire and clean things up a bit since I have to move the board around. I didn't want to start out with the linear PS and remote TKD pot without knowing how it would sound. The remote pot and board is about $150. It is a much better pot and it should improve the clarity. Same for the PS. I am going to add a 3rd input as well.
My Gear- Mains System-Pass X250 amp, BAT VK-51se preamp, Luxman DA-06 DAC, Magnepan 1.6's, Thorens TD-145 TT, Dual Martin Logan Subs, Vintage Luxman T-110 Tuner, Cables-WW Platinum 7 USB, Cardas Parsec XLR, AQ Columbia DBS 72v XLR, Belden 8402 XLR.
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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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