Work in progress tube amp. - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 3 Old 07-29-16, 12:27 AM Thread Starter
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Travis
 
Join Date: May 2015
Location: Concord, Ca
Posts: 13
Work in progress tube amp.

Not sure if anyone is interested in old tube amp restoration? But here is a project that I am working on. Its a vintage 1960'ish Heathkit AA-100. I got it as a non-working project. It now works well and just needs some minor clean up on some previous repairs. It sounds great!! So far I have not plugged a turntable into it but hopefully that input works. My test bench setup is an old sony cd player and my no-name "studio monitor" speakers. I don't trust this 55+ year old amplifier enough to plug in anything nice...

So far it has all new tubes and caps. It also had few bad traces and cold solder joints on the circuit board. All the variable resisters and switches have been cleaned too. One mistake was using Russian made output tubes. They sound good, but are just a little taller than the original tubes. So the top of the case does not fit anymore. Honestly that does not bother me. I kinda like looking at glow of the tubes. I may never bother buying shorter tubes.

Here are a couple pics of the amp after some of the repairs were made. Still on the bench being tested.


The front looks pretty good for it's age.



New caps. Also check out the good size output transformers.



The tall caps look original but they have been replaced, one is new and the other has been gutted and new caps installed inside it.


You can see where someone put short jumpers on bad traces on the circuit board. I am going to try and make it look a little cleaner. There is a repair tag sticker from Heathkit dated 1981 on the bottom cover of the amp. There is another sticker under the 1981 sticker but I cant read it. So this poor amp has been repaired at least a couple times before I got it.


Travis
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post #2 of 3 Old 07-29-16, 11:40 AM
 
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Ron
 
Join Date: Feb 2012
Location: In the Home Theater
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Re: Work in progress tube amp.

Great job, Travis! Hopefully I will get a chance to hear it someday...it has been years since i have had any tube equipment. I do remember that cables and isolation made huge differences in the sound of the Audible Illusions preamp I used to have. Try some sorbothane pucks under it, and see if it makes any difference. I might still have some brass cones to let you try out too.

Ron

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post #3 of 3 Old 09-08-16, 02:30 PM
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jcmusic
 
Join Date: Sep 2016
Posts: 45
Re: Work in progress tube amp.

I have some old Scott tube stuff.
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