Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Effects => Topic started by: 12bz7 on March 05, 2010, 10:01:49 am

Title: Hoffman tube pedal Layout
Post by: 12bz7 on March 05, 2010, 10:01:49 am

I just noticed that on V2 that pin1 is connected to pin7. Is it o.k to have dc on the grid of that tube?

Title: Re: Hoffman tube pedal Layout
Post by: Geezer on March 07, 2010, 04:54:38 am

Quote from: 12bz7 on March 05, 2010, 10:01:49 am

I just noticed that on V2 that pin1 is connected to pin7. Is it o.k to have dc on the grid of that tube?

DC coupled cathode follower....... http://www.freewebs.com/valvewizard1/dccf.htm

Check out V2 on the 5F6A Bassman (linked below).
The Hoffman tube pedal circuit is basically a Bassman/Plexi preamp in a separate liitle box.

http://www.el34world.com/charts/Schematics/fender/BASSMAN_5F6A.pdf

Title: Re: Hoffman tube pedal Layout
Post by: 12bz7 on March 07, 2010, 11:20:53 pm

Thanks Geezer, I've got so much to learn.

Title: Re: Hoffman tube pedal Layout
Post by: Geezer on March 08, 2010, 05:37:44 am

I remember the 1st time I saw that CF......I said "What the?" :laugh: