Output Transformer A-8094??

mauiboy81 · Post by **mauiboy81** » Thu Jun 18, 2009 10:55 pm

Hi guys,

I have an output transformer from an old 60's executone pb-325 amplifier that I don't know much about. I think it was connected to a socket plug connector and said 70v, 20v, 3.5v

It is a black standup kind like the dyna clones and has A-8094 punched into the case.

Anyone know who made this or have any info on this transformer and whether it is suitable for guitar amp use?

thanks,

Nick

Structo · Post by **Structo** » Thu Jun 18, 2009 11:17 pm

Sounds like an old Public Address style OT.
They used to run a 70 volt output on those to power a bunch of speakers.

mauiboy81 · Post by **mauiboy81** » Thu Jun 18, 2009 11:44 pm

That's what I was thinking.

So basically it's unusable?

Would there need to be a step down transformer at the speaker?

FYL · Post by **FYL** » Fri Jun 19, 2009 7:35 am

It is a black standup kind like the dyna clones and has A-8094 punched into the case.

Could be a Stancor A-8094.

mauiboy81 · Post by **mauiboy81** » Fri Jun 19, 2009 8:09 am

Hey Thanks,

I checked the transformer and it is bigger than the one in the Stancor pdf.
Also, I have the PT which is labeled A-8096 and it is totally different than the A-8096 in the Stancor files. Both PT and OT have 682 242 stamped under the A-#.

I see someone is selling the exact amp on the bay check it out:

http://tinyurl.com/luba4u

Thanks,

Nick

FYL · Post by **FYL** » Fri Jun 19, 2009 9:53 am

Both PT and OT have 682 242 stamped under the A-#.

682 is the EIA code for Electrical Windings, Inc. of Chicago, Ill. Stancor uses (used) 138.

mauiboy81 · Post by **mauiboy81** » Fri Jun 19, 2009 10:49 am

You wouldn't happen to have any info files on them would you?

FYL · Post by **FYL** » Fri Jun 19, 2009 2:47 pm

You wouldn't happen to have any info files on them would you?

No general info, only on some specific models such as the ones used by Ampeg.

The company still exists and maybe has an archive department.

Electrical Windings
2015 N. Kolmar Ave.
Chicago, IL 60639-3417

(773) 235-3360

Baxtercat · Post by **Baxtercat** » Fri Jun 19, 2009 7:36 pm

My question w/b, if making a little Boogie amp using a PA head like this w/ the 70V lead, is just removing those speaker sockets and shrink-wrapping or taping up the lead good enough? Or is there more that should be done?
[I'll have to shoot some inside pics to show....]

mauiboy81 · Post by **mauiboy81** » Fri Jun 19, 2009 8:18 pm

Thanks FYL for the help.

I tried calling them but couldn't get through. I'll try again some time.

So is the OT I have useable in a guitar amp with the secondary windings as they are? Or should I just forget about it. I feel like I read somewhere that you need a step down transformer at the speaker with this type of OT, is that correct? Or do the lower voltage 3.5v or maybe the 20v taps translate to 8ohm and 16ohm or something?

Please forgive my ignorance on this subject.

Thanks

Nick

FYL · Post by **FYL** » Sun Jun 21, 2009 9:15 am

So is the OT I have useable in a guitar amp with the secondary windings as they are?

Dunno. You should get full specs or measure them...

M Fowler · Post by **M Fowler** » Mon Jun 22, 2009 2:52 pm

Check here for similiar question.

http://www.diytube.com/phpBB2/viewtopic ... 42efe4749f

Baxtercat · Post by **Baxtercat** » Mon Jun 22, 2009 9:56 pm

Useful descriptions in that old link: Thxxx!

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Output Transformer A-8094??

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