Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Oddvar on April 29, 2016, 11:56:56 am

Title: 18 watt Hoffman Stout into 30 watt?
Post by: Oddvar on April 29, 2016, 11:56:56 am

HI.

Is there a possibility of making the Hoffman Stout 18 watter into 25-30 watt?

Title: Re: 18 watt Hoffman Stout into 30 watt?
Post by: sluckey on April 29, 2016, 12:29:04 pm

Yes. Just add two more EL84s, and get a PT and OT that are designed for an AC-30. Use different cathode resistors for the EL84s. Basically just copy the AC-30 output stage.

Title: Re: 18 watt Hoffman Stout into 30 watt?
Post by: Oddvar on April 30, 2016, 03:28:03 am

Thanks again, is there a layout for that somewhere?

Title: Re: 18 watt Hoffman Stout into 30 watt?
Post by: basschops1528 on April 30, 2016, 06:15:25 am

This is the AC30 layout here. Check out the power amp section on the right as Sluckey mentioned.

Title: Re: 18 watt Hoffman Stout into 30 watt?
Post by: sluckey on April 30, 2016, 08:49:31 am

Quote from: Oddvar on April 30, 2016, 03:28:03 am

Thanks again, is there a layout for that somewhere?

Just put the layouts for the Stout and AC-30 side by side. The changes you need to make should be obvious.

Title: Re: 18 watt Hoffman Stout into 30 watt?
Post by: basschops1528 on April 30, 2016, 09:02:32 pm

Oddvar, I attached the PDF for the Stout to my last post