Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: johngovan on November 17, 2022, 05:59:29 pm

Title: 5e8 preamp question.
Post by: johngovan on November 17, 2022, 05:59:29 pm

I want to omit the extra tubes or input channels and make it just one input channel instead of four. My question is, is the 270k resistor that is highlighted in red needs to go to ground or should I also omit that one?

Title: Re: 5e8 preamp question.
Post by: sluckey on November 17, 2022, 06:39:33 pm

Omit.

Title: Re: 5e8 preamp question.
Post by: johngovan on November 17, 2022, 06:46:08 pm

Thank you so much Sluckey. I need to finalize the layout. It helps a lot.

Title: Re: 5e8 preamp question.
Post by: sluckey on November 17, 2022, 06:55:18 pm

I would also consider removing the other 270K mixing resistor and that extra 100K mixing resistor.

Title: Re: 5e8 preamp question.
Post by: johngovan on November 17, 2022, 09:31:55 pm

Quote from: sluckey on November 17, 2022, 06:55:18 pm

I would also consider removing the other 270K mixing resistor and that extra 100K mixing resistor.

These resistors? I'm i correct?

Title: Re: 5e8 preamp question.
Post by: sluckey on November 17, 2022, 09:42:42 pm

Yes. Pot wiper connects directly to next tube grid.

Title: Re: 5e8 preamp question.
Post by: johngovan on November 17, 2022, 09:46:30 pm

Quote from: sluckey on November 17, 2022, 09:42:42 pm

Yes. Pot wiper connects directly to next tube grid.

Thank you so much. I'm really excited to make a low wattage 5e8.