Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Misc Schematics and Layouts => Topic started by: jd6string on March 13, 2014, 09:27:20 am

Title: questions on a Brownface Deluxe
Post by: jd6string on March 13, 2014, 09:27:20 am

I'm looking to build a copy of an old Deluxe Fender amp. I have the schematic and layout for a Fender Brownface Deluxe, but it doesn't show the polarity of the caps. I'm wondering if anyone knows of an updated copy of the schematic that shows polarity and possibly better graphics. Or if there is a way to determine polarities from the original schem.

Title: Re: questions on a Brownface Deluxe
Post by: sluckey on March 13, 2014, 10:20:33 am

You can look at the schematic to determine polarity. There is a voltage given at every point where a polarized cap is shown. For the 6G3 amp every polarized cap has the negative terminal connected to ground, EXCEPT the bias cap, which has the positive terminal connected to ground. The bias cap also has polarity indicated on the schematic as well as the layout.

This is the cleanest schematic/layout I've seen...

     http://www.el34world.com/charts/Schematics/files/fender/Fender_DELUXE_6G3.pdf (http://www.el34world.com/charts/Schematics/files/fender/Fender_DELUXE_6G3.pdf)

Title: Re: questions on a Brownface Deluxe
Post by: jd6string on March 13, 2014, 11:21:13 am

Quote from: sluckey on March 13, 2014, 10:20:33 am

You can look at the schematic to determine polarity. There is a voltage given at every point where a polarized cap is shown. For the 6G3 amp every polarized cap has the negative terminal connected to ground, EXCEPT the bias cap, which has the positive terminal connected to ground. The bias cap also has polarity indicated on the schematic as well as the layout.

Thanks for the tip. I figured they were neg side to grd, but failed to notice the voltage readings. Thanks again!