Sounds like a shorted tube. Is there negative grid current?
73
Jim W7RY
-----Original Message-----
From: mike stokes
Sent: Monday, April 13, 2015 12:25 PM
To: Amps
Subject: [Amps] LK-500 ZB
Hello
I have a Amp Supply LK-500 ZB and yesterday it made a big bang and blew
both fuses. Now when I power it up the meter says it is drawing about 300
mA while sitting idle. I have performed a visual inspection and there is
no visual evidence of anything being wrong. I bought it used, so it is
uncertain if the power supply has ever been rebuilt. Any thought were to
begin the troubleshooting ? Is the p/s board worth rebuilding or should I
drop in a Harbach replacement board ?
Comments appreciated.
Thanks in advance and 73
--
Mike Stokes
KK9V
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