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Unknown Heathkit Transistor Stereo Amp

krowmagnum

krowmagnum

Compulsive speaker freak
I posted about this a while back and got a few suggestions as to what the model number might be but didn't have photos of it posted. I looked up the suggested models and found nothing matching this one. Some looked really close with the exception of the power button on the lower right (Heathkit logo).

I finally got it back home and took photos for everyone to ponder. There is no model number on the outside I haven't had a chance to open it up but will post nudies later.

Heathkit4.jpg


Heathkit2.jpg


Heathkit1.jpg


There is a cover on the lower half with lots of buttons and knobs but my camera battery was dying so I'll post another frontal shot later.

Anyone seen one of these or have one ?
 
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Sorry, Too bad since I won't use Uups anymore I guess I'll have to keep it myself :D You wouldn't believe what I went through to get this thing. I found it in the deep recesses of an electronics warehouse where old electronics go to die. The place is huge and is partitioned off in at least 20 different rooms with crap piled everywhere. Most of it is old satellite tv stuff from the owners old mail order business but there's tons and tons of weird electronic stuff from who knows what or where. Very little audio stuff and this was the only thing worth grabbing that I could find but I'm sure I missed a room or ten. The only way I can describe the place is it would be a person with OCD's worst nightmare.

It's amazing how dirt and grime can preserve something. I cleaned it up a little and here's the new and improved AA 21:

Heathkit8.jpg


Heathkit6.jpg


Heathkit7.jpg


I need to replace the power cord before I can do anything else but it's looking more and more like a keeper.

I found 2 different wpc ratings for the AA 21. One site listed 35wpc and another listed 50wpc but either way that should be plenty for my office set-up after I drop it off at my tech buddy's house.
 
It is likely going to be full of germanium transistors. This isn't bad but they're hard to find these days if you need one.

Otherwise, that's classic Heath mid-60s styling.

Cheers,

David
 
Oh man, that's a beautiful amp!

LOVE the input level controls...they are one of the reasons that I use a mixer as a preamp, I can really get the levels balanced out where they should be.
 
dshoaf said:
It is likely going to be full of germanium transistors. This isn't bad but they're hard to find these days if you need one.

Otherwise, that's classic Heath mid-60s styling.

Cheers,

David
Click to expand...

NTE still has germaniums. They're expensive, but available.
 
Old_Tech said:
Man I have not heard of germanium transistors in so long. wooo!

.3v forward bias voltage drop vs .7v in silicon

Thanks for that DS and Sam :thmbsp:
Click to expand...

I have an Altec mixing amp with germanium outputs - I stumbled across the NTE parts when I was trying to find some useful information on those old-school transistors.
 
Doug G. said:
Hey, I said it was probably an AA-21 in his original thread without the aid of pictures! So there.

:D

Doug
Click to expand...

Yes you did. :thmbsp: I searched all over the internet for AA-21 photos and couldn't find any except for one photo of the un-built kit in a box.
 
krowmagnum said:
I found 2 different wpc ratings for the AA 21. One site listed 35wpc and another listed 50wpc but either way that should be plenty for my office set-up after I drop it off at my tech buddy's house.
Click to expand...

When these transistor amplifiers came out, the marketing departments of most electronics HiFi companies wanted to have there model described as the "Bestest" and the "More Powerful" amps. Therefore, they came up with IHF power, Peak Power and of course, the only true measurement is RMS. I would bet it is 35 Watts RMS and 50 Watts IHF. Heathkit and Allied Radio's Knight-Kit used the IHF rating as well as HH Scott. Finally, they settled down when the powerhouse stuff came out. (Remember the Sansui 9090DB, 125 Watts RMS per channel? ;))

That may be the difference. This amp was the follow on (read replacement) to the AA-100 7591 output version. They look very similar.
 
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