Bill Turner wrote:
On Tue, 13 Apr 2004 09:55:33 +0000 (UTC), (Per-Ake
Andersson) wrote:
I have a powersupply which have been stored for 15 years.
Now I want to use it. But I think the high volt(500 V) capacitors
need to be refreshed (right word?). (To slowly increase the voltage.)
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This isn't quite what you asked, but I'd recommend just replacing them.
Electrolytics are notorious for drying out and 15 years is really
pushing it. I'd just replace them with some new ones.
Wow, I have lots of 15 y.o.+ electrolytics that are still going strong.
I didn't have a variac, so here's what I did to rejuvenate a SB-200 I
restored a while back:
I made a fixture of a standard light bulb socket.
This socket was wired in series with the amplifier power cord.
Starting out with a 10 watt light bulb, I plugged it in, and turned it
on. I left it running in this setup for an hour.
Next I replaced the 10 watt bulb with a 25 watt bulb. Repeat the burn
in process.
I worked my way up the wattage scale until I reached 100 watts. At that
point I put the tubes back in, turned it on and it worked just fine.
- Mike KB3EIA -