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Firing up old tube amps. Should I worry?

Hey, I'm going to fire up a pair of World Audio Design KEL80 monoblocks I built probably 15 years ago. They probably haven't been on in 10+ years. Anything I should worry about? All parts used back then were new and good ones - may have upgraded the capacitors. I don't have a Variac, so I can't ramp up the voltage. They worked back then, but I'm just a little concerned they'll arc or something and blow my speakers.
128x128marlin38
hifigeek1
770 posts
 
The amp should NOT be powered up unless you monitor voltage while running the amp up on a variac. Either buy a variac, or bring it to a tech who can do that for you. If you value the amp, start it up that way especially if the company is no longer in business and replacement parts may not be available. I do that with equipment that hasn't been run in 5 years as well...
marlin38's avatar
marlin38 OP
20 posts
 
Thanks for all your input. I'm running the left channel right now on a cheapo computer speaker. Seems fine, no weird popping noises or buzzing at start up. I think I'm in the clear on this one. I'm going to run it for about 15 minutes, shut it down and then do the same to the right monoblock.

Fingers crossed.
rrog
1,958 posts
 
It is always risky with equipment that hasn't been used for some time.
hhh
75 posts
 
Agreed bring them up using a variac.
marlin38's avatar
marlin38 OP
20 posts
 
Right channel works normally too. I'll try not to let another 10 years pass before I run them!
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