Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: upnorth2 on November 27, 2013, 10:18:44 am

Title: Single channel AB763 build
Post by: upnorth2 on November 27, 2013, 10:18:44 am

Hello,

New to the forum and started building/fixing tube amps about a year ago at age 53. (No, that's not too old) Just need to ask something as I learn to navigate this forum. I'd like to build a single channel AB763, Deluxe or Vibroverb, eliminating channel 1. I should be able to mod a Princeton Reverb chassis I think. It seems pretty straight forward, removing channel 1 from the schem. and layout, including the 220K (X), V6 - pin 2. My question is about the 820 ohm resistor, V2 - pin 8. Need to change this? Any others?  Sorry if my circuit savvy is limited.

Thanks for any input.

Title: Re: Single channel AB763 build
Post by: sluckey on November 27, 2013, 10:57:09 am

Quote

My question is about the 820 ohm resistor, V2 - pin 8. Need to change this?

Yes. Change to 1500Ω.

Title: Re: Single channel AB763 build
Post by: silverfox on November 27, 2013, 11:04:03 am

Welcome,

There is a goldmine of information here as well as a great parts source.

You may already have found this but if not the Tube Amp Schematic Library is a great resource:
 
http://www.el34world.com/charts/Schematics1.php (http://www.el34world.com/charts/Schematics1.php)

Silverfox.