Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Papa Jim on February 27, 2019, 06:04:38 am

Title: Adjustable Amp Voltage
Post by: Papa Jim on February 27, 2019, 06:04:38 am

I want to build a chassis to experiment with modifying and building different amps onto. Extra switch selectable wired up paralleled sockets for quick preamp tube comparisons, adjustable NFB, adjustable B+ voltage, etc. etc. Is there any downside other than space required to use pots for B+ voltage changing, and NFB  values?

Title: Re: Adjustable Amp Voltage
Post by: Ritchie200 on February 27, 2019, 08:11:15 am

Papa Jim

Sounds like you are ready to get serious.  Check here for some ideas.

Jim

https://el34world.com/Forum/index.php?topic=15445.0

Title: Re: Adjustable Amp Voltage
Post by: jjasilli on February 27, 2019, 10:41:42 am

Maybe a breadboard instead of a chassis.


Weber sells a PT with a variety of secondary voltages.  You could also use a variable bench power supply.  The downside is that exact tranny selection will affect amp performance & tone.