converting Hammond ao63 into guitar amp

General discussion area for tube amps.

Moderators: pompeiisneaks, Colossal

Post Reply
vengeantcuff
Posts: 3
Joined: Mon May 12, 2014 12:05 am

converting Hammond ao63 into guitar amp

Post by vengeantcuff »

I recently acquired a Hammond ao-63 amplifier. Has any one tried to convert this to a guitar amp. Is there anything worth salvaging in it or should I just sell it. I have all the tubes and this amp did work before I got it. This is my first post and would also be my first attempt at converting a amp. I've have done repairs but I really don't know where to start.
User avatar
lord preset
Posts: 447
Joined: Tue Aug 27, 2013 3:06 am
Location: San Diego

Re: converting Hammond ao63 into guitar amp

Post by lord preset »

A quick Google reveals no obvious source for schematics or conversion documentation. This chassis appears to be relatively uncommon and uses less common tubes (7591 power tubes, etc). If it were me this would not be where I would start - it appears doable but you would be more or less on your own. There is a lot more info available on converting AO-35, AO-29, AO-39 and perhaps others. I just did a conversion of an AO-39 and it was more or less paint by the numbers due to excellent documentation being available. http://home.comcast.net/~seluckey/amps/ ... ammond.htm
billc
Posts: 53
Joined: Wed Apr 02, 2014 4:33 pm
Location: Sonoma, Calif.

Re: converting Hammond ao63 into guitar amp

Post by billc »

You could probably build a most excellent amp from it but it might be best to try a less challenging build first. I have an AO-68 myself in the pipeline and am probably going to go with an Ampeg build as the tube lineup is similar. What tubes does your amp have?? FWIW there is a sticky thread here on Hammond conversions at https://tubeamparchive.com/viewtopic.php?t=24331
vengeantcuff
Posts: 3
Joined: Mon May 12, 2014 12:05 am

Re: converting Hammond ao63 into guitar amp

Post by vengeantcuff »

I searched around and couldn't find anything for this amp. It does use the same tubes as some ampeg models and some other amps from same era.
This is the info i found about the tubes
HAMMOND E-100 Family (E-100 Preamp + AO-63 Reverb/Power Amp)
E-100 Preamp

Preamp Tubes :
12AU7/ECC82 (1), 12AX7/ECC83 (3), 6267/EF86/6J32P (2)

AO-63 Power Amp

Rectifier Tubes:
5AR4/GZ34 (1), 6CA4/EZ81 (1)

Preamp Tubes:
12AU7/ECC82 (1), 7247/12DW7/ECC832 (3)

Power Amp/Driver Tubes:
6GW8/ECL86 (2)
7591 (2)
Regan
Posts: 76
Joined: Sat May 03, 2008 10:54 pm

Re: converting Hammond ao63 into guitar amp

Post by Regan »

I haven't seen one, but going by the tube lineups I think you should buy a couple chassis and you have the makings of two amps( might have to source a power trasformer for one)
An ef86, 12ax7 and the 6gw8's for a watkins westminsterish vox build, and the other stuff for an ampeg style.
Maybe tough if its your first go at it, but its doable. I would definitely start with the first one listed, cheapest to build with the parts on hand.
Regan
vengeantcuff
Posts: 3
Joined: Mon May 12, 2014 12:05 am

Re: converting Hammond ao63 into guitar amp

Post by vengeantcuff »

Thanks so much for the help. I am glad I found this forum. There is a lot of good info on here and some great help and minds. I might see what else my father has lying around from His old organ days.
Post Reply