Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Esquirefreak on June 01, 2023, 12:49:19 pm

Title: Parallel triode Rg values
Post by: Esquirefreak on June 01, 2023, 12:49:19 pm

Hi, all.

Haven't built anything in quite a while. Struggling with life in general made spring time rough. You know how the song goes.

Anyhow:
I gutted one of my amps, cause I thought I'd build something. A single channel 5F6A, but with the first two triodes in parallel, one VOL pot and a single pair of HI/LO inputs.

My question is - do I simply cut the grid stopper values (coming from the input) in half? That is 2*33k resistors instead of the usual 2*68k resistors. I haven't messed around with parallel triode stages before.

Best regards from Sweden,
Max

Title: Re: Parallel triode Rg values
Post by: mresistor on June 01, 2023, 12:50:35 pm

Yes

Title: Re: Parallel triode Rg values
Post by: mresistor on June 01, 2023, 01:12:43 pm

Here's an example using Hoffmans single channel DR 


 https://el34world.com/Hoffman/files/Hoffman_AB763_1.pdf


scroll down to the schematic and look at the input

Title: Re: Parallel triode Rg values
Post by: Esquirefreak on June 01, 2023, 01:42:27 pm

Thumbs up for the help. Thanks!

/Max