Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => PC Express and JSchem - Schematics and Layout diagrams => Topic started by: EL34 on October 03, 2008, 09:21:36 am

Title: Hoffman/Randall amps
Post by: EL34 on October 03, 2008, 09:21:36 am

Revision D of a Hoffman/Randall

This is a 50watt version.
Just add two more power tubes and the parts that go with a power tube.
Like 1K screen grid resistor, 5.6k input grid resistor and 1 ohm cathode resistor.
Change the feedback resistor to a 100k for a 100 watt version.

Title: Re: Hoffman/Randall amps
Post by: EL34 on October 06, 2008, 06:36:35 am

This post has revision D .sch file

I split this topic off the hoffman randall topic in the big board
http://www.el34world.com/Forum/index.php?topic=4098.new#new

I still haven't gone over the schematic with a fine tooth comb to check for errors

My original layout diagrams for these amps are on the library page
They are split into pre amp and power amp
(http://www.el34world.com/Hoffman/images/Ranpre.gif)

(http://www.el34world.com/Hoffman/images/Ranpwr.gif)