The problem is the mu

Tubes Asylum

Questions about tubes and gear that glows. FAQ

Posted by Ralph (M) on September 15, 2020 at 12:35:39

In Reply to: 6922 to 6SL7 posted by Rikkitik on September 14, 2020 at 08:42:28:

the 6DJ8 is about 33 or so. The 6SL7 is a lot higher, and the 6SN7 is lower.

If you have a 47K plate load the 6SL7 is out of the question.

So only the 6SN7 would work and to do that, you'd have to changed out the cathode resistor that is likely setting the operating points of the two tubes in the circuit.

A schematic would be helpful.

You also cannot expect the gain on account of the lower mu. You'll need a sine wave generator and an oscilloscope at the least in order to make this change- plus a good soldering skill. I would be hesitant to attempt this without a schematic.

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Follow Ups Full Thread

Topic - 6922 to 6SL7 - Rikkitik 08:42:28 09/14/20 (16)

RE: 6922 to 6SL7 - immatthewj 21:43:16 09/17/20 (5)

RE: 6922 to 6SL7 - Rikkitik 15:07:28 09/18/20 (4)

RE: 6922 to 6SL7 - Sondek 21:31:44 09/18/20 (2)

RE: 6922 to 6SL7 - Rikkitik 12:19:36 09/26/20 (1)

RE: 6922 to 6SL7 - Sondek 18:08:24 09/26/20 (0)

RE: 6922 to 6SL7 - immatthewj 21:03:55 09/18/20 (0)

RE: 6922 to 6SL7 - Sondek 14:12:51 09/17/20 (0)

The problem is the mu - Ralph 12:35:39 09/15/20 (1)

RE: The problem is the mu - mraudio 20:34:15 09/15/20 (0)

Tube adapters are no substitute for design. - andy evans 15:20:29 09/14/20 (3)

RE: Tube adapters are no substitute for design. - Rikkitik 10:47:12 09/15/20 (2)

I was being positive!!! - andy evans 01:34:40 09/16/20 (1)

RE: I was being positive!!! - Rikkitik 09:01:31 09/16/20 (0)

RE: 6922 to 6SL7 - Eli Duttman 12:26:10 09/14/20 (2)

RE: 6922 to 6SL7 - Rikkitik 10:16:46 09/26/20 (0)

You are too correct - Victor Khomenko 15:31:19 09/21/20 (0)

Follow Ups

The problem is the mu - Ralph 12:35:39 09/15/20 (1)

RE: The problem is the mu - mraudio 20:34:15 09/15/20 (0)

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