[V8] Old music or good music...

[diemarthadie at aol.com]

 Party pooper.  The flash-bang of old caps can be fun!  I've also got a pile of bits waiting for someday.  I run some and the rest sits along with a few hundred tubes, waiting for me to get to them.  There's at least one Dynaco amp in there.  And a nice 100w Magnatone head waiting to rebuild.  I'd give my left arm for the time and money needed for Someday...  

John


 

-----Original Message-----
From: Mike Arman <Armanmik at earthlink.net>
To: v8 <v8 at audifans.com>
Sent: Tue, Apr 10, 2012 2:29 pm
Subject: [V8] Old music or good music...




For any of us who happen to have older tube-type electronic equipment stashed 
away and plan to use 
it again "someday" or sell it - do NOT "plug it in to see if it works" because 
it won't!


The electrolytic capacitors (the big, aluminum cylinders) in the power supply 
will have dried out by 
now, and the results could be quite spectacular - for a few moments, anyway.


Open the covers (top and bottom) and inspect FIRST. Look for whitish "glop" 
oozing out of the bottom 
of the power supply electrolytic capacitors - if you see any, that cap is bad. 
Check them for bulges 
as well - a bulged capacitor is trash. Look at the silver, reflective spot on 
the inside of each 
vacuum tube. That's the "getter" and it "gets" stray air molecules to keep the 
correct level of 
vacuum in the vacuum tube. If the getter is white instead of silver and 
reflective, the tube is bad.


Use some contact cleaner on all the switches and controls. After 30 or 40 years, 
these things get 
quite oxidized and nasty. Dirty controls make for noise in the speakers, and if 
they are bad enough, 
can block the signal entirely. Work each control a minimum of 20 or 30 times, 
spritzing a little 
contact cleaner into the control from time to time. (Radio Shack sells it.)


Connect a pair of speakers and some audio input source, some of these things 
don't like to run open 
circuit.


NOW you're ready to put the power to it BUT: The key here is to use a Variac 
(adjustable line 
transformer), set on the lowest setting, and SLOWLY, over a day or so, gradually 
raise the voltage 
to full line voltage. This gives the capacitors a chance to re-form (if they are 
going to), and when 
you're all done, you will still have something to sell or enjoy.


I have a fair sized stack of Dynaco equipment waiting for "someday", and 
probably 600 classical LPs, 
some of which are brand new and still in the cellophane wrapper - came from an 
estate, the guy was 
the culture critic for a major newspaper "up nawth" and the record companies 
sent him dozens of 
brand new LPs, most of which never even got opened.


Best Regards,

Mike Arman
90 V8Q, gas tank full of glop



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