Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: bullkelp on May 18, 2018, 02:44:38 pm

Title: single channel ab763 deluxe reverb - 6v6?
Post by: bullkelp on May 18, 2018, 02:44:38 pm

Hi all
Long time lurker, first time poster :)
I'd like to build a single channel ab763 with reverb and trem
I note Dougs single channel project calls for 6l6 output tubes and larger transformers(like a super reverb), where as the two channel (traditional DR) uses 6v6 tubes and smaller iron.

I all ready have two 6l6 amps and id really like a conventional 6v6 DR sound but just without the clutter of the 'normal' channel that I never use.

My question is can I just follow the same hoffman single channel ab763 schematic/layout/bill of materials except for the power tubes and transformers (which I would substitute deluxe reverb rather than super reverb type iron and tubes) ?

Thanks, and sorry if this seems like a silly question. Im a bit of a newb but I have done some builds in the past, but not for a few years.

Title: Re: single channel ab763 deluxe reverb - 6v6?
Post by: shooter on May 18, 2018, 03:39:05 pm

I'd say a qualified yes;
here's the 6V6 I looked at;

http://el34world.com/charts/Schematics/files/Fender/Fender_deluxe_reverb_aa763_schem.pdf

your B+ tap for the PA tubes, and bias range on Doug's version need to be checked against the 6V6 version, but it's running 415vdc at plate so, guessing that is comparable to Doug's  :dontknow:

Title: Re: single channel ab763 deluxe reverb - 6v6?
Post by: sluckey on May 18, 2018, 04:38:02 pm

Quote from: bullkelp on May 18, 2018, 02:44:38 pm

I'd like to build a single channel ab763 with reverb and trem
My question is can I just follow the same hoffman single channel ab763 schematic/layout/bill of materials except for the power tubes and transformers (which I would substitute deluxe reverb rather than super reverb type iron and tubes) ?

The AB763 is a family of amps, not a single amp. The whole family uses the same schematic but a few parts are different. Look at this BOM  and schematic for the 2 channel AB763. They list all the different parts for the different models within the AB763 family. Basically, the transformers and power tubes are the only things that are different. However, there are some differences in small components too.

http://el34world.com/Hoffman/files/Hoffman_AB763_2_BOM.pdf
http://el34world.com/Hoffman/files/Hoffman_AB763_2.pdf

Study these and then apply to the single channel amp.

Title: Re: single channel ab763 deluxe reverb - 6v6?
Post by: bullkelp on May 18, 2018, 07:13:32 pm

Thanks guys
Yeh that answers my question
Minor changes in small parts but mainly transformers and power tubes
Appreciate the input