Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: knebiter on September 28, 2022, 12:00:02 pm

Title: G3 to ground
Post by: knebiter on September 28, 2022, 12:00:02 pm

Merlin sez "connecting the suppressor to ground will dramatically increase the harmonic distortion" on a pentode.
Ref. https://www.pearl-hifi.com/06_Lit_Archive/02_PEARL_Arch/Vol_16/Sec_53/Electronics/Electronics_1953/Electronics_10_Oct_1953.pdf Pg.200.
I was thinking of building a TOD and trying to incorporate or test this out in the preamp section. Perhaps via momentary footswitch and relay to grab some Zack Wylde type screechers?
Has anyone here ever experimented with it? It would be nice to have some idea before punching holes in a chassis.

Title: Re: G3 to ground
Post by: PRR on September 28, 2022, 01:04:38 pm

6AS6 is an unusual "pentode".

Where does Merlin discuss this?

Title: Re: G3 to ground
Post by: knebiter on September 28, 2022, 01:23:18 pm

"Designing Tube Preamps..." 2nd Ed. pg. 42
6AS6 is pretty cheap...

Title: Re: G3 to ground
Post by: PRR on September 28, 2022, 11:52:45 pm

> 6AS6 is pretty cheap...

Too cheap not to try. (But what values??)