Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Misc Schematics and Layouts => Topic started by: fedcarmo on June 07, 2012, 10:03:18 pm

Title: 1937 amp head PA
Post by: fedcarmo on June 07, 2012, 10:03:18 pm

i recently bought on ebay a 30 watts tube amp PA...and i am searching for any information about it. No tubes...no schematic...but a i thing it's a challenging restoration project...hhhheeeellllllpppppp fellows!!!

Title: Re: 1937 amp head PA
Post by: LooseChange on June 08, 2012, 05:20:15 am

If you can't find any information on this unit, you have two choices... reverse engineer or build whatever you want in the amp. You have some clues and could get tubes that would be used in this amp even if you design your own. Looks like fun!

Title: Re: 1937 amp head PA
Post by: fedcarmo on June 08, 2012, 10:03:00 am

thanks a lot! yesterday a user from other forum sent me the schematic!!! so...i gonna search for the tubes...check voltages and see how it works...and if the sound is not really good...rebuilding rebuildin rebuilding...maybe a tweed or champion or any other version in that category...i just need a clean head for rehersals.

bye

Title: Re: 1937 amp head PA
Post by: fedcarmo on June 08, 2012, 10:45:25 pm

sure!!!

here is the link cause the file is too big to upload here..

http://www.theused.com/manuals/magnavox/magnavox_a-3023_ap-3023a_b_c.pdf (http://www.theused.com/manuals/magnavox/magnavox_a-3023_ap-3023a_b_c.pdf)


saludos!

Title: Re: 1937 amp head PA
Post by: super&plexi on January 09, 2014, 06:48:34 pm

I know it's old topic, but does anyone know of 'modern amp company'-THD, Demeter, whatever, that put out an amp that looks very similar to this, (from my memory), circa 10yrs ago-give or take.

I played with knobs, while someone was playing through a used one at GC. It had amazing ability to sustain at almost zero level-(u could barely hear it's volume, but could clearly hear endless sustain,-and not necessarily distortion, just sustain of note. Couldn't crank it, had to take care of other things,...it remains as a 'one that got away'-mystery sort of.            would love to actually put one through paces.

I ask every now and then, of players, and no one so far has any idea what it was. I seem to think it was pricey...maybe 1000.00, maybe it was 15 yrs ago, maybe single ended, multiple ohm taps, cage on top,(for sure), black w/gold lettering, even those knobs remind me of it.  small, maybe 12-14''X 9-10'' X 3''(without cage)-maybe 10''high w/cage....