Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Oddvar on December 25, 2016, 07:06:27 am

Title: Diode rectifier for Tube...
Post by: Oddvar on December 25, 2016, 07:06:27 am

Hi.  Any suggestions on how to build a diode rectifier instead of  tube in Hoffman 18w Marshall?

Title: Re: Diode rectifier for Tube...
Post by: sluckey on December 25, 2016, 07:57:05 am

Just put a couple diodes on the tube socket. One connects between pins 4 and 8. The other connects between pins 6 and 8. Cathodes will be on pin 8.

Title: Re: Diode rectifier for Tube...
Post by: dunner84 on December 25, 2016, 11:37:11 am

Sluckey is right, it's pretty easy. Rob Robinette posts on another forum, but he has a great webpage dedicated to tube amp mods.
This link has a good layout for this, just disregard the switch if you only want SS rectification.
https://robrobinette.com/5e3_Modifications.htm#Rectifier_Switch

Title: Re: Diode rectifier for Tube...
Post by: Oddvar on December 25, 2016, 02:26:13 pm

Hi and thanks.  Do I need jumpers between anything if I'm not usinge a tube?

Title: Re: Diode rectifier for Tube...
Post by: sluckey on December 25, 2016, 02:31:07 pm

Quote from: Oddvar on December 25, 2016, 02:26:13 pm

Hi and thanks.  Do I need jumpers between anything if I'm not usinge a tube?

Quote from: sluckey

Just put a couple diodes on the tube socket. One connects between pins 4 and 8. The other connects between pins 6 and 8. Cathodes will be on pin 8.