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September 12, 2014, 05:51 PM #1Super Moderator
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Is it possible to wire Conrad Johnson amps in Triode mode? ....
I seem to remember some amps were available wired for Triode operation. Does anyone know if it's still possible? I sent a note to CJ and I'm still waiting for their response.
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September 12, 2014, 06:23 PM #2Senior Member
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
Two questions here:
1) is it possible to wire CJ amps in triode? The answer is yes.
2) Will CJ perform this for you? The answer is I have no idea.
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September 12, 2014, 06:26 PM #3Super Moderator
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
Thanks Mark. I am waiting for an official answer but may have to call next week.
Originally Posted by mep
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September 12, 2014, 07:43 PM #4Senior Member
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
If you were handy with a soldering iron, you could do it yourself. You basically are just electrically connecting the grid to the plate so they are at the same electrical potential which turns a pentode into a triode (pin 4 to pin 3). There is usually a 100 ohm resistor that goes from the grid to ground as well.
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September 12, 2014, 08:24 PM #5Member
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
Sorry mep, not quite right. It is pins 3 and 4, but it is called the screen grid. Just "grid" usually means control grid which is the tubes input (pin 5). I mention this, because incorrect wiring will result in fireworks.
The 100 ohm resistor you mention goes between the plate and screen, not to ground. It's there to limit current to the screen which is far more delicate than the plate.
Pin numbers are for kt88, el34 etc.Dan Santoni
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September 12, 2014, 08:27 PM #6Senior Member
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
I've yet to hear a pentode based amplifier sound better run in triode. Last cj amplifier I remember that was convertible was the Prem. 8. Think that says a lot. If it was better, cj would offer it.
You just sacrifice way too running in triode.
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September 12, 2014, 08:36 PM #7Senior Member
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
Yes, it's called the screen grid which is pin 4 as I said. If you tied the control grid (pin 5) that would be a problem. As for the 100 ohm resistor, I just remember that it's usually necessary and I may have been mistaken for where it's tied to. It's been a long time since that was on my tube radar. Originally Posted by blackdog
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September 12, 2014, 08:40 PM #8Senior Member
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
You give up power and some control/punch in the bass typically. You normally lose about 1/2 of your pentode output power. Some people love the sweetness of the triode sound and are willing to sacrifice the bass punch and extra power to gain that sweetness. Not so good for rock, but some jazz people and chamber music people think it's the bomb. Some amps give you a switch so you can listen in either mode vice having it hardwired in. Originally Posted by Myles B. Astor
I've yet to hear a pentode based amplifier sound better run in triode. Last cj amplifier I remember that was convertible was the Prem. 8. Think that says a lot. If it was better, cj would offer it. You just sacrifice way too running in triode.
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September 12, 2014, 08:44 PM #9Senior Member
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
Agreed but it's sweet because the upper octaves are rolled off. Plus it's kinda boring. Now not saying triode amps are bad but there's something about 6550s run in triode. You want a triode? Give me a 211 based amplifier. Originally Posted by mep
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September 12, 2014, 08:47 PM #10Senior Member
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
I'm not a big fan of 6550s in the first place and that goes for the vaunted Tung-Sol 6550 as well. Don't get me wrong, I would take Tung-Sol 6550s over GE 6550s all day long. Originally Posted by Myles B. Astor
Agreed but it's sweet because the upper octaves are rolled off. Plus it's kinda boring. Now not saying triode amps are bad but there's something about 6550s run in triode. You want a triode? Give me a 211 based amplifier.
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September 12, 2014, 11:36 PM #11Super Moderator
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
I appreciate everyone's thoughts. I would not do it on my ART monos but would consider ordering an amp wired that way if CJ gives the thumbs up or says they like what they hear. I do agree Myles, that the fact it's not offered currently kind of says something.
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September 13, 2014, 01:38 AM #12Super Moderator
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
Hi Myles Originally Posted by Myles B. Astor
Agreed but it's sweet because the upper octaves are rolled off. Plus it's kinda boring. Now not saying triode amps are bad but there's something about 6550s run in triode. You want a triode? Give me a 211 based amplifier.
Any recommendations for a 211 amp? Thanks.Fleetwood Deville by Oswald Mills Audio, Vienna Acoustics Haydn Jubilee, Wharfedale Linton w/ stands, Klipsch RB-75, Klipsch RP-160M.
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September 13, 2014, 09:52 AM #13Senior Member
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
Haven't listened to any lately seriously since they all tend to be lower powered. (Isn't the Cary Mike was talking about recently 211 based?). Two that I would check out are the Tube Guru and Tron. I think AirTight did at one time make a 211 based amp too.
Best I ever heard was a 100 watt 211 based amp from Sonic Frontiers. You've never heard things sound more real or images feel more palpable.Myles B. Astor, Senior Editor, PF, www.positive-feedback.com
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September 13, 2014, 12:22 PM #14Member
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
Cary makes one that you can switch between 211 and 845 tubes. The CAD805SE.Isn't the Cary Mike was talking about recently 211 based?)
You could also try the Coincident 211 Dragon. Two 211's in push pull.Dan Santoni
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September 13, 2014, 12:28 PM #15Senior Member
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
BTW, assume the reason more designers don't use 211s is the 1400 V. Originally Posted by joeinid
Myles B. Astor, Senior Editor, PF, www.positive-feedback.com
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September 13, 2014, 01:35 PM #16Member
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
I agree with Myles, no pentode amp I've heard sounds better in triode mode. Originally Posted by Myles B. Astor
I've yet to hear a pentode based amplifier sound better run in triode. Last cj amplifier I remember that was convertible was the Prem. 8. Think that says a lot. If it was better, cj would offer it. You just sacrifice way too running in triode.Founder: AVShowrooms featuring video reports of audio shows, company tours and reviews. Resume' includes; the absolute sound, Stereophile, Listener Magazine, founder Philadelphia Audio Society. Top articles: Lamm ML3- TAS, YG Anat III Signatures- TAS, Ayon- TAS, Coincident Speaker Technology- TAS, Single Ended Survey- TAS, Fisher 500c- Stereophile, Bozak CGs- Stereophile, Box Sets- Listener, Dynaco ST70-Listener. Best catch phase: Bugatti of Audio.
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September 14, 2014, 12:45 AM #17Super Moderator
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
Originally Posted by Myles B. Astor
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September 15, 2014, 05:21 PM #18Super Moderator
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
Update:
Conrad Johnson will wire an ARTsa in triode mode and substitute the KT120 for Mullard EL34's.
That could be fun!Fleetwood Deville by Oswald Mills Audio, Vienna Acoustics Haydn Jubilee, Wharfedale Linton w/ stands, Klipsch RB-75, Klipsch RP-160M.
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September 15, 2014, 05:39 PM #19Audioshark
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
Cool! Originally Posted by joeinid
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October 28, 2014, 03:59 PM #20Member
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Re: Is it possible to wire Conrad Johnson amps in Triode mode? ....
Same could be said of both of my Bob Latino amps. Easily switchable to triode mode with toggles on the top deck. I could experiment endlessly. Eventually just left them in ultralinear. Far more lively with more the "bite" of the real thing. If I did such a mod, I would certainly make it switchable.
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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.
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