Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Jonas on February 10, 2025, 08:31:57 pm

Title: spliting plate load resistors
Post by: Jonas on February 10, 2025, 08:31:57 pm

Could someone help me understand why the plate load resistors are split as shown in the reverb circuit?

reference SLUCKEYS revide (full PDF attached)

Title: Re: spliting plate load resistors
Post by: trobbins on February 10, 2025, 08:50:58 pm

Perhaps to adjust the nominal gain from the stage if a different valve model is used that has higher gain.  Perhaps to bring down the signal gain to better suit following stages.

Title: Re: spliting plate load resistors
Post by: stratomaster on February 10, 2025, 09:02:26 pm

B+ = Ground from an AC perspective, so it's just a convenient way to build a resistive voltage divider into the plate resistance.  It allows you to cut the signal level while keeping the gain of the triode intact.