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Old 28th January 2012, 04:14 PM   #1
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Default old Heathkit amp

Hi all, first post. I built a Heathkit AA-32 stereo amp which is about 40 years old. I haven't used it in years but have recently renewed my interest in audio and fired it up...works like it did as new! Question.. would it help extend tube life if I plug it into a variable power supply and slowly turn up the voltage? thanks
Jeff B
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Old 28th January 2012, 04:22 PM   #2
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Default forgot to add pic....

I forgot to add a pic of my Heathkit AA-32...looks new!
Jeff B
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Old 28th January 2012, 04:48 PM   #3
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Quote:
Originally Posted by samcataudio View Post
Hi all, first post. I built a Heathkit AA-32 stereo amp which is about 40 years old. I haven't used it in years but have recently renewed my interest in audio and fired it up...works like it did as new! Question.. would it help extend tube life if I plug it into a variable power supply and slowly turn up the voltage? thanks
Jeff B
You've already powered it up to listen to it. What's the point of the Variac now?

G
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Old 28th January 2012, 04:56 PM   #4
ODougbo is offline ODougbo  United States
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Pic?....I think I have some of that stuff, tucked away.

Quote:
Originally Posted by samcataudio View Post
I forgot to add a pic of my Heathkit AA-32...looks new!
Jeff B
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Old 28th January 2012, 06:47 PM   #5
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Default pics....

looks new!
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File Type: jpg heath 1.jpg (64.2 KB, 107 views)
File Type: jpg IMG_1181.JPG (45.0 KB, 105 views)
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Old 28th January 2012, 06:51 PM   #6
tinitus is offline tinitus  Europe
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nice
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Old 28th January 2012, 07:30 PM   #7
rmyauck is offline rmyauck  Canada
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Yes it wouldn't hurt! I think the it would be easier on filaments. Also helps with todays high line voltages. ICL's could be used too to help filaments and caps.
If it hasn't had all the coupling caps and PS caps changed you are risking your Transformers and sometimes tubes. Good to clean and tension tube sockets and check resistors too.

Randy
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Old 28th January 2012, 08:00 PM   #8
DF96 is offline DF96  England
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With old unused valve amps the fragile component which needs to be carefully woken up is not a valve but the main electrolytic smoothing/reservoir caps.
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Old 28th January 2012, 08:07 PM   #9
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If you have "awakened" the old amplifier by applying full voltage, I see little need to use a Variac.
I would keep a close watch on the electrolytic capacitors. Because of their age, they are likely to fail.
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Old 28th January 2012, 08:10 PM   #10
rmyauck is offline rmyauck  Canada
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Here's more on old caps:

Reforming capacitors, NOS and used - AudioKarma.org Home Audio Stereo Discussion Forums

http://www.audiokarma.org/forums/sho...d.php?t=416418

Last edited by rmyauck; 28th January 2012 at 08:12 PM.
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