Howdy folks!

pushpull7591 · 27th April 2005, 02:23 PM

Well, this is my first post so I thought I'd stop by and say "hi!"

I got my first tube amp-an HH Scott 299C a couple years back. Learned a lot restoring that and loved the sound. That led to restoring a 299B and then a 296.

The 296 kinda weaned me off the pleasures of restoration-I guess restoring a 296 can do that to a guy-and I got the itch for a DIY.

I loved the sound of those 7591s better than anything else I'd heard so the first project is: you guessed it, a push-pull 7591-based stereo amp!

I'm knee-deep in it now, waiting for more parts and coming up with more and more questions!

Hope I can find some answers, and maybe pass along what little I know along the way.

Best,
PP7591

EC8010 · 27th April 2005, 02:36 PM

Welcome to the forum. We're always keen to extend a warm welcome to valve DIYers. I had to look up the books to see what a 7591 was, but it looks as though you should be able to make a nice PP amplifier with it.

pushpull7591 · 27th April 2005, 05:23 PM

Hiya ec8010, and thanks for the welcome!

As for the 7591, it was used in some vintage amps, but kind of fell by the wayside since the pin-out is different than EL or 6L6 types, making swapping a bit difficult. Guess that makes it kind of a red-headed stepchild of sorts for a DIY-but then I've always had a soft spot for the underdog...

Best,
pp7591

EC8010 · 27th April 2005, 05:39 PM

Quote:

Originally posted by pushpull7591
As for the 7591, it was used in some vintage amps, but kind of fell by the wayside since the pin-out is different than EL or 6L6 types, making swapping a bit difficult.

I expect that makes it cheaper (and being NOS, possibly better).

planet10 · 27th April 2005, 07:20 PM

Welcome, PP7591

Quote:

Originally posted by EC8010
I expect that makes it cheaper (and being NOS, possibly better).

IIRC, it became vry hard to find, so became quite dear, but there is "new" production now?

dave

pushpull7591 · 27th April 2005, 07:42 PM

Hey planet10-thanks for the welcome as well!

They were indeed a bit scarce for a while-a matched quad of NOS could go for as much as $2-400, depending on the manufacturer!

In the last few years Electro-Harmonix and JJ/Tesla have both come out with new reproductions. My experience with the EH has been very positive-and at @ $60-80 for a matched quad it's hard to beat the price.

I think it's a great little tube and just sounds "right" for my ears!

EC8010,

I've got a few NOS Westinghouse and RCA 7591s, and in this case-at least to my ears-I think the new production has the NOS beat!

Better AND cheaper than NOS?

It's a win-win situation!

Best,
pp7591

EC8010 · 27th April 2005, 10:21 PM

Glad (and surprised) to hear current production is cheaper and better than NOS.

27th April 2005, 02:23 PM	#1
pushpull7591 diyAudio Member Join Date: Apr 2005 Location: Iowa	Howdy folks! Well, this is my first post so I thought I'd stop by and say "hi!" I got my first tube amp-an HH Scott 299C a couple years back. Learned a lot restoring that and loved the sound. That led to restoring a 299B and then a 296. The 296 kinda weaned me off the pleasures of restoration-I guess restoring a 296 can do that to a guy-and I got the itch for a DIY. I loved the sound of those 7591s better than anything else I'd heard so the first project is: you guessed it, a push-pull 7591-based stereo amp! I'm knee-deep in it now, waiting for more parts and coming up with more and more questions! Hope I can find some answers, and maybe pass along what little I know along the way. Best, PP7591

27th April 2005, 02:36 PM	#2
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Welcome to the forum. We're always keen to extend a warm welcome to valve DIYers. I had to look up the books to see what a 7591 was, but it looks as though you should be able to make a nice PP amplifier with it. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

27th April 2005, 10:21 PM	#7
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Glad (and surprised) to hear current production is cheaper and better than NOS. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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27th April 2005, 05:23 PM	#3
pushpull7591 diyAudio Member Join Date: Apr 2005 Location: Iowa	Hiya ec8010, and thanks for the welcome! As for the 7591, it was used in some vintage amps, but kind of fell by the wayside since the pin-out is different than EL or 6L6 types, making swapping a bit difficult. Guess that makes it kind of a red-headed stepchild of sorts for a DIY-but then I've always had a soft spot for the underdog... Best, pp7591

27th April 2005, 07:42 PM	#6
pushpull7591 diyAudio Member Join Date: Apr 2005 Location: Iowa	Hey planet10-thanks for the welcome as well! They were indeed a bit scarce for a while-a matched quad of NOS could go for as much as $2-400, depending on the manufacturer! In the last few years Electro-Harmonix and JJ/Tesla have both come out with new reproductions. My experience with the EH has been very positive-and at @ $60-80 for a matched quad it's hard to beat the price. I think it's a great little tube and just sounds "right" for my ears! EC8010, I've got a few NOS Westinghouse and RCA 7591s, and in this case-at least to my ears-I think the new production has the NOS beat! Better AND cheaper than NOS? It's a win-win situation! Best, pp7591

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