6BG6G mono amp sounds great but

Posted by PeterI (A) on June 13, 2017 at 16:14:31

I recently built a 6BG6G audio amplifier, first of a stereo pair, loosely based on a 1950s Grommes 216BA amp. Sounds fantastic, no distortion. My question is, the cathode voltage doesn't really measure.
I have 395V on plates, 340V on screen (pentode mode), -49V on grid, but I measure .222VDC on the cathode. There is a 50ohm balancing pot between the cathodes, and I just adjust to make them the same for now. Bias is adjustable. It's odd. No red-plating; I'm inclined to leave it alone but wondering if anyone willing to comment on the cathode voltage.

Thanks

Pete

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Topic - 6BG6G mono amp sounds great but - PeterI 16:14:31 06/13/17 (21)

This is what they look like... (pic) - PeterI 14:33:52 06/14/17 (4)

RE: This is what they look like... (pic) - Triode_Kingdom 23:19:29 06/14/17 (0)

RE:Nice work! (nt) - vinnie2 18:47:19 06/14/17 (0)

They look great! (nt) - Tre' 18:03:52 06/14/17 (1)

Thanks (pic) - PeterI 18:41:01 06/14/17 (0)

Schematic shows - FenderLover 06:20:36 06/14/17 (12)

RE: Schematic shows - PeterI 07:28:48 06/14/17 (11)

RE: Schematic shows - Audio Pete 14:47:27 06/15/17 (0)

That's not correct - Triode_Kingdom 10:16:19 06/14/17 (4)

RE: That's not correct - Audio Pete 14:44:08 06/15/17 (2)

RE: That's not correct - Tre' 20:32:20 06/15/17 (0)

RE: That's not correct - Triode_Kingdom 19:47:42 06/15/17 (0)

Thanks for info NT - PeterI 16:10:34 06/14/17 (0)

RE: Schematic shows - FenderLover 07:37:25 06/14/17 (4)

RE: Schematic shows - PeterI 07:54:45 06/14/17 (3)

RE: Schematic shows - FenderLover 09:24:00 06/14/17 (2)

RE: Schematic shows 5U4 5V4 - PeterI 10:24:22 06/14/17 (1)

RE: Schematic shows 5U4 5V4 - FenderLover 16:50:10 06/14/17 (0)

RE: 6BG6G mono amp sounds great but - Triode_Kingdom 19:24:13 06/13/17 (0)

RE: 6BG6G mono amp sounds great but - Blackdog 18:54:07 06/13/17 (1)

RE: 6BG6G mono amp sounds great but - PeterI 20:47:08 06/13/17 (0)

6BG6G mono amp sounds great but

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