[Amps] LK-500 ZB

[Jim W7RY]

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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