Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: BrainDeadAmps on December 09, 2022, 12:03:37 am

Title: Power tube tremolo pot failure precaution
Post by: BrainDeadAmps on December 09, 2022, 12:03:37 am

When using a Princeton style output tube bias tremolo, I was considering wiring a large resistor from the wiper to the ground lug on the intensity pot.

My thinking is that is would act as a backup ground reference for the output tubes in-case the pot fails, the same way a resistor is added to post phase inverter master volume pots.

cheap protective measure or any reason not to?

Title: Re: Power tube tremolo pot failure precaution
Post by: pdf64 on December 09, 2022, 03:24:29 am

Good idea, I don’t see a downside  :thumbsup:

Title: Re: Power tube tremolo pot failure precaution
Post by: sluckey on December 09, 2022, 05:29:28 am

Do you have a cathode biased PR? All I've ever seen were fixed bias. Either way, still a good idea.

Title: Re: Power tube tremolo pot failure precaution
Post by: BrainDeadAmps on December 09, 2022, 07:41:06 am

Thanks for the responses guys!

Sluckey, the amp I’m currently building is cathode biased.