Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: tubeswell on July 13, 2014, 01:04:02 am

Title: Is there a Hoffman filter cap board for AB763 DR?
Post by: tubeswell on July 13, 2014, 01:04:02 am

i.e.: for the caps that sit in the doghouse?


(Couldn't see it for looking in the on-line store)



TIA

Title: Re: Is there a Hoffman filter cap board for AB763 DR?
Post by: EL34 on July 19, 2014, 05:59:58 pm

Hi, I don't have a drilled board for filter caps.
You could make your own very easy
It's less than 15 lugs or eyelets

I mount mine along the front panel under the pots and eliminate all that monkey business

Here's my Hoffman AB763 amp

(http://el34world.com/Hoffman/images/IMG_0633.jpg)

Title: Re: Is there a Hoffman filter cap board for AB763 DR?
Post by: EL34 on July 29, 2014, 06:28:08 am

Another easy method is to just set up terminal strips and string your caps between them
Super easy if you have some room inside the amp

Title: Re: Is there a Hoffman filter cap board for AB763 DR?
Post by: EL34 on July 29, 2014, 07:02:54 pm

Also, one more suggestion

Ever see the really old cap cans that had the caps glued inside with sticky rubber
And they had a wire bundle coming out a grommet hole?

No Board needed for that sort of arrangement

I always opt for not using a cap can, cap board and all that extra unneeded stuff

I really like having the filter caps inside the chassis and along the front edge under the pots

Title: Re: Is there a Hoffman filter cap board for AB763 DR?
Post by: EL34 on July 30, 2014, 05:40:18 pm

Thanks,
That was a bombed out Deluxe Reverb chassis that was part of a pile of amp junk I bought
The power transformer hole had been hacked

I installed one of my AB763 1 channel boards
I installed a 022798 power tranny which is the super reverb PT
I made a 2 x 10 baffle board for it

So it's a Super Deluxe Vibrolux reverb bastard  :icon_biggrin:

I still have this amp
It's my go-to amp for clean surf stuff

Title: Re: Is there a Hoffman filter cap board for AB763 DR?
Post by: Willabe on July 30, 2014, 06:00:58 pm

Yes it is beautiful work!

Well if that's a SR PT in there now, then they must have hacked it for a Twin Reverb PT?


               Brad    :icon_biggrin:

Title: Re: Is there a Hoffman filter cap board for AB763 DR?
Post by: EL34 on July 30, 2014, 06:06:05 pm

Thanks and if I remember correctly, it had a twin PT sized hole and it might have had some bastard power tranny in it when I got it
This was in the late 90's and I have CRS disease

As you can see I had to use fender washers to get a grip on the chassis for the SR power tranny

Not to hijack this thread any more than I have but this is this amp
http://el34world.com/Misc/Music/files/1983Merman.mp3 (http://el34world.com/Misc/Music/files/1983Merman.mp3)

Title: Re: Is there a Hoffman filter cap board for AB763 DR?
Post by: billcreller on August 02, 2014, 09:51:53 pm

I think I have CRS disease too, but I can't remember...

Title: Re: Is there a Hoffman filter cap board for AB763 DR?
Post by: EL34 on August 03, 2014, 06:04:47 am

 :icon_biggrin:

Title: Re: Is there a Hoffman filter cap board for AB763 DR?
Post by: EL34 on August 10, 2014, 09:51:56 am

Here's a couple pages in the library on Filter cap layouts


http://el34world.com/charts/filtercaps.htm (http://el34world.com/charts/filtercaps.htm)

http://el34world.com/charts/fenderservice7.htm (http://el34world.com/charts/fenderservice7.htm)

Title: Re: Is there a Hoffman filter cap board for AB763 DR?
Post by: jojokeo on August 11, 2014, 02:23:55 am

Hi Doug,
Do you have a photo of the caps under the pots that shows the view looking from the rear of the chassis? I'd like to see how you've mounted & ran the resistors. Also, is the white wires going to/from the pots all shielded? Hard to tell...

thanks-

Title: Re: Is there a Hoffman filter cap board for AB763 DR?
Post by: EL34 on August 11, 2014, 07:16:42 am

I have a bunch of pics of the guts on this page


http://el34world.com/Hoffman/AB763Project.htm (http://el34world.com/Hoffman/AB763Project.htm)


(http://el34world.com/Hoffman/images/Dscn0294_small.jpg)