Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Oddvar on July 04, 2016, 05:56:26 am

Title: Blues junior Questins
Post by: Oddvar on July 04, 2016, 05:56:26 am

Hi.

I am trying to figure out how to hookup a the mains to a Blues Junior Hoffman build.  I have the original Fender transformer, but I am a bit confused on how to hook it up.  The original hookup had a 4 pin powerswitch.  The common and the hot from 240 v wall is on two lower pins, the PT has one white with black stripe and a loose black cord is coming out from the other on the two upper.  Which is the fuse connection and on the power transformer, which is which?

On the Hoffman build on the transformer page ther is two 47uf's that is drawn going to ground, but says it is on the board, a bit concusing?

And the last is the output red lead is said to be going to the B+ on the board, is that where the 450 volt cap comes in?

Thanks.

Title: Re: Blues junior Questins
Post by: tubenit on July 04, 2016, 06:01:59 am

Have you looked at the Fender schematic?

http://el34world.com/charts/Schematics/files/fender/Fender_Schematics.htm (http://el34world.com/charts/Schematics/files/fender/Fender_Schematics.htm)

With respect, Tubenit

Title: Re: Blues junior Questins
Post by: Oddvar on July 04, 2016, 06:26:44 am

Hi.  I triued to, but i didn't get an wiser...