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In Reply to: RE: Questions about 6BG6G amp build (schematic) Grommes 216BA posted by PeterI on May 22, 2017 at 21:02:33
I'd put more filtering on the bias supply. And an adjustable pot. Maybe, change R27 to 22K-ohm and add a 10k linear pot? But, the values may change when you tap the bias supply off a new transformer. Looks like you'd need around -45VDC.
I'd sub a 100mfd/100VDC cap (C3) on the bias supply.
Edits: 05/22/17Follow Ups:
Yes, that's good advice. I will make a small perfboard circuit w/ small Tamura trans and diode bride (not half-wave as original). I don't have a lot of real estate for another pot. 1/2W pot would be ok? Thanks
1/2-watt pot will be fine. I'd put that pot into the bias supply. You are prolly going to using old-stock tubes. These tend to range all over the place, when it comes to idle bias dissipation settings.
Good luck on the project! I love old-school stuff. Tell us how you like those 6BG6B tubes.
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