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Re: [Amps] LK-500 ZB

To: "mike stokes" <>, "Amps" <>
Subject: Re: [Amps] LK-500 ZB
From: "Jim W7RY" <>
Reply-to: Jim W7RY <>
Date: Mon, 13 Apr 2015 20:52:33 -0700
List-post: <">>
Sounds like a shorted tube. Is there negative grid current?

Jim W7RY

-----Original Message----- From: mike stokes Sent: Monday, April 13, 2015 12:25 PM To: Amps Subject: [Amps] LK-500 ZB
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
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