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[AMPS] LK500-ZB Amp Supply

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Subject: [AMPS] LK500-ZB Amp Supply
From: (
Date: Sat, 6 Feb 1999 16:17:21 -0500

On Sat, 06 Feb 1999 15:59:56 -0500 Tony Martin <> writes:
>I have just recently acquired an Amp Supply LK500-ZB which
>appears to be in excellent condition, HOWEVER there is a problem
>and to be honest I'm stumped.  In brief, here is the scenario:
>140ma idling current


>0 grid current (with or without drive)

>3200volts B+ (drops to 3100 when relay activates)

Indicates the HV and bias ckt working OK.

>50 watts of drive from OMNI 6 is 0 watts when relay engages in amp.
>Plate current does not change with or without drive (when relay

What is the input VSWR at that point?

>Same cabling when hooked to my AL80B amp, works like a champ.
>The LK500ZB is non QSK .. same for the AL80B
>Zener diode replaced.

Waste of time I suspect.

>Plate current does not change with drive applied from OMNI 6.
>Welcome any and all suggestions....

Trace the RF path all the way thru to the grids, sounds like an open. Are
the input network relays functioning ? How about the primary input
relay....that amp uses a DIP relay for the input.

Let me know ur progress... or lack therof. I have owned a LK500ZC since
new in 1987-88.

73  Carl  KM1H

>I apologize in advance if it is something stupid!!!!!!!!!
>Tony, W4FOA
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