View Full Version : Heathkit 7591 ?


jaymanaa
08-13-2010, 09:23 AM
I didn't know Heathkit ever built a 7591 integrated. Anyone know anything about this dude (excsept that the recifier is gassed out)?:D

mhardy6647
08-13-2010, 09:25 AM
The AA-151 was 7591pp, wasn't it?
EDIT: No, but the AA-100 was...
http://www.heathkit-museum.com/hifi/hvmaa-100.shtml

jaymanaa
08-13-2010, 09:40 AM
I bet that's it. Pretty impressive specs, and an interesting tube choice (7199 and EF86).:scratch2: This one was about 30 minutes from the house and only twice it's original kit price, what could I do?:D

golana
08-13-2010, 09:48 AM
Funny, that doesn't look like the reddish Cadillac faced 151. Innards aren't the same either. Go get it, still see Stancor Tx's.

jaymanaa
08-13-2010, 09:52 AM
Yeh, I have a couple 151s and this has a totally different look. It's already paid for, just have to get up the gumpshin to make the trip.:D

mhardy6647
08-13-2010, 09:55 AM
No, the one Jay's showing is probably older - but Heathkit used to restyle the same basic products (while also changing the model numbers). I don't know the one Jay showed, but I do know the AA-100.

DanO55
08-13-2010, 10:40 AM
I notice that unit on ebay. Did you get it? It caught my eye too when I saw it.

jaymanaa
08-13-2010, 10:43 AM
No, the one Jay's showing is probably older - but Heathkit used to restyle the same basic products (while also changing the model numbers). I don't know the one Jay showed, but I do know the AA-100.

That's what made me look at it twice. I'm not a fan of integrateds or the 7591 in general, but this thing just caught my eye. I guess that's what I get for even looking.:D I have a Fisher KX200 that uses 7591s and has the same funky "center channel". You have to pull about two amps worth of wire out of one of those to get it sounding Hi-Fi. The upside to that is, Fisher used great wire.:yes:

jaymanaa
08-13-2010, 10:44 AM
I notice that unit on ebay. Did you get it? It caught my eye too when I saw it.

:yes: I threw a 222.22 snipe at it. That's my lucky number.:D

Stephen J
08-13-2010, 10:44 AM
I notice that unit on ebay. Did you get it? It caught my eye too when I saw it.

Yeah,I saw it too.They had it listed as a receiver.

jaymanaa
08-13-2010, 10:46 AM
Yeah,I saw it too.They had it listed as a receiver.

Yeh, rack mount, when you can clearly see the funky Lafeyette looking feet on the front. I think rack mount is fancy verbage for no cover.:D

bricktop
08-13-2010, 11:31 AM
Check to see if it uses the same output transformers as the AA-100 (# 51-58). If it does, they are pretty good ones (so I read).

http://www.one-electron.com/trans_p1.pdf

Tinkerbelle
08-13-2010, 01:14 PM
That looks to be the Heathkit AA-50.

adpopulum
08-13-2010, 01:24 PM
I threw a 222.22 snipe at it. That's my lucky number

Good to know :D

jaymanaa
08-13-2010, 03:45 PM
Check to see if it uses the same output transformers as the AA-100 (# 51-58). If it does, they are pretty good ones (so I read).

http://www.one-electron.com/trans_p1.pdf

Yep 51-58s, big ol' suckers. She looks to have minumul use, the boards aren't crispy at all, the Mullard 5AR4 is cracked, but the quad of WH 7591s have as good a getter flash as I've seen on this tube number. All the small tubes are original Mullard save for one 7199 that was replaced with an RCA at some point. I'm dying to hook it up, but the bench is just too full right now.:thumbsdn:

jaymanaa
08-13-2010, 04:11 PM
That looks to be the Heathkit AA-50.

Damn close, it's a 60. The more I look at it, the more impressed I become. I'm thinking this is going to be a really nice little integrated. Haven't really looked at the phon stage yet though.

Tinkerbelle
08-13-2010, 04:43 PM
Damn close, it's a 60. The more I look at it, the more impressed I become. I'm thinking this is going to be a really nice little integrated. Haven't really looked at the phon stage yet though.
Really? I thought the AA-60 (couple just sold on the 'bay) is a mono preamp, possible mate to the mono AA-61 (similar to UA-1/UA-2). :scratch2:
http://www.nostalgickitscentral.com/heath/products/audio.html
http://www.audiokarma.org/forums/showthread.php?t=262828

Maybe they used the same number for different models. :dunno:

jaymanaa
08-15-2010, 06:02 PM
Really? I thought the AA-60 (couple just sold on the 'bay) is a mono preamp, possible mate to the mono AA-61 (similar to UA-1/UA-2). :scratch2:
http://www.nostalgickitscentral.com/heath/products/audio.html
http://www.audiokarma.org/forums/showthread.php?t=262828

Maybe they used the same number for different models. :dunno:

How come I'm always correcting myself around you.? It is a 50, my old eyes ain't none too good. But hey you're a girl, you ain't supposed to be so smart about cool stuff like this.:D Just Kidding Just Kidding Just Kidding.:D

Would you believe I dropped it this morning. Luckily I had taken the 7591s that are WH and test like new, out of it. I sacrificed my body and stuck my leg under it to break the fall which help. Now I have a bent corner on the face but I think I can straighten it out on my break. The leg will heal as well.:thmbsp:

mhardy6647
08-15-2010, 06:09 PM
Would you believe I dropped it this morning. Luckily I had taken the 7591s that are WH and test like new, out of it. I sacrificed my body and stuck my leg under it to break the fall which help. Now I have a bent corner on the face but I think I can straighten it out on my break. The leg will heal as well.:thmbsp:

Imagine the obituary if gangrene sets in - Local audiophile dies doing what he loves...

jaymanaa
08-15-2010, 06:51 PM
Imagine the obituary if gangrene sets in - Local dumbshit dies doing what he loves...

Fixed for ya Mark.:thmbsp:

GordonW
08-16-2010, 09:28 AM
Jay, that's got the exact same circuit boards in it as the AA100 that I modded. Just do the stuff I did to the AA100 (convert to individual bias on each output tube, change the 12AX7s to 12AT7s (which really helps the phono stage, BTW), change the output tube bias supply resistors from 470K to 220K, and replace/upgrade the caps) and it will SING. As I said about the AA100... it sounds like a TRULY MODERN HIFI AMP once its done. Great bass, great dynamics.

Regards,
Gordon.

radioactive
08-16-2010, 09:23 PM
yep basically a aa100 a friend had both the 50 and 100 andf other than cosmetics and output rating theyre the same.