Re: circuit changes to accomodate 6SL7 as CCS

Posted by Ralph (M) on April 26, 2002 at 09:38:55

In Reply to: 6SL7 tube CCS in V3 socket posted by Paul Speltz on April 16, 2002 at 10:34:23:

Here are some tweaks if you want to use the 6SL7 as the V3 CCS tube:

Change the cathode resistor on V3 pin 3 to 32K.

Add a second 47 volt zener diode in series with the first on the grid of V2, raising the grid voltage up to roughly 90 volts. The 499K resistor could be changed too (but its not too critical) to 332K or thereabouts.

Distortion is further reduced and dynamic range is slightly improved.

Finding decent 6SL7s is a problem- most of the current production tend to be microphonic. This is a problem in the circuit as microphonics in the CCS tube are definately audible.

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Follow Ups Full Thread

Topic - 6SL7 tube CCS in V3 socket - Paul Speltz 10:34:23 04/16/02 (17)

Re: circuit changes to accomodate 6SL7 as CCS - Ralph 09:38:55 04/26/02 (0)

Re: 6SL7 tube CCS in V3 socket - Roy 15:41:03 04/17/02 (6)

Zeners - Paul Speltz 08:18:56 04/18/02 (5)

Re: Zeners - Roy 11:47:55 04/18/02 (4)

Re: Zeners - Paul Speltz 19:46:01 04/18/02 (3)

No zeners - Lew 07:12:19 04/19/02 (0)

Re: Zeners - Roy 02:50:29 04/19/02 (0)

Re: Zeners - Al Sekela 20:30:09 04/18/02 (0)

Re: 6SL7 tube CCS in V3 socket - Al Sekela 15:26:20 04/16/02 (1)

Re: 6SL7 tube CCS in V3 socket - Shred 16:28:42 04/16/02 (0)

Re: 6SL7 tube CCS in V3 socket - Wayne 13:45:08 04/16/02 (0)

Paul,... - Michael 13:36:53 04/16/02 (2)

Re: Paul,... - Paul Speltz 15:19:55 04/17/02 (1)

Thanks fo the offer... - Michael 19:55:56 04/17/02 (0)

Re: 6SL7 tube CCS in V3 socket - Lew 13:36:19 04/16/02 (2)

Re: 6SL7 tube CCS in V3 socket - Paul Speltz 15:03:56 04/17/02 (1)

Re: 6SL7 tube CCS in V3 socket - Lew 07:21:21 04/18/02 (0)

Follow Ups

Re: circuit changes to accomodate 6SL7 as CCS - Ralph 09:38:55 04/26/02 (0)

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