Finished my 1st tube amp build - thanks for your help!

justinis · **Joined:** July 15th, 2016, 10:02 am **Posts:** 74

With tons of help from the awesome folks on this forum and Audiokarma.org, I just finished my 1st tube amp build. It uses the transformers and tubes from a Heathkit AA-100, a Dynaco ST-70 driver board from Parks Audio, and a power supply PCB I made myself. I got the idea from a DIY builder named Tom McNally who did basically the same build 10 years ago.

I did a complete writeup here: http://bit.ly/st-40_amp. It just got posted on Hackaday!

I'm very happy with out the project turned out. Here are some photos:

I just want to say a HUGE thank you to everyone here who helped me with this project! :clap:

A special thanks to dberning who had me over to his place to check out some instability problems! It was so awesome of all of you folks to lend me your time and expertise. Here are all the DCAudioDIY threads I posted while working on the project:

http://dcaudiodiy.com/phpBB3/viewtopic.php?f=4&t=665
http://dcaudiodiy.com/phpBB3/viewtopic.php?f=4&t=674
http://dcaudiodiy.com/phpBB3/viewtopic.php?f=4&t=676

Roscoe Primrose · **Joined:** February 28th, 2013, 10:38 am **Posts:** 1712

So, how does it sound????

Roscoe

justinis · **Joined:** July 15th, 2016, 10:02 am **Posts:** 74

Roscoe Primrose wrote:

So, how does it sound????

Haha I probably should have mentioned that. I love the sound! :music-listening:

but of course now I want new speakers.

tomp · **Joined:** February 28th, 2013, 3:31 pm **Posts:** 1828

Absolutely beautiful construction job. Congrats.

Tom

SoundMods · **Posted:** August 30th, 2016, 11:58 am

ZOWIE!! That was your first???? NICE! Very nice! :clap:

I see it uses 7199 power tubes that fell out of favor in the distant past for reasons that escape me. They were designed from the start for audio amplifiers and used by Fisher and H.H. Scott to name but two manufacturers that come to mind.

SamB · **Posted:** August 30th, 2016, 12:23 pm

Agree.
As far as I noted, if you don't overload the tube, pentaode sound amazing!

justinis · **Joined:** July 15th, 2016, 10:02 am **Posts:** 74

Thanks, everyone!

SoundMods wrote:

I see it uses 7199 power tubes that fell out of favor in the distant past for reasons that escape me. They were designed from the start for audio amplifiers and used by Fisher and H.H. Scott to name but two manufacturers that come to mind.

I think maybe you mean 7591s? It doesn't use 7199s.

SoundMods · **Posted:** August 30th, 2016, 1:31 pm

Yes. Sorry -- 7591s. It's a shame they're not pin compatible with 6L6s.

Pelliott321 · **Posted:** August 30th, 2016, 4:17 pm

absolutely beautiful. Brilliant case/chassis design

Cogito · **Joined:** July 17th, 2016, 6:24 am **Posts:** 1132

Looks beautiful. Nice Job.

Does it sound as good as it looks?

DCAudioDIY.com

Finished my 1st tube amp build - thanks for your help!

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