[Amps] Re: LK-500ZC problem

[PAUL HEWITT]

If the  B- rail is elevated above chassis ground for IG metering purposes,
anode current will flow through the grid meter shunt (during standby) if the
cathode is grounded to chassis, (internally or externally).  This is the
wrong direction for the shunt hence the negative grid current reading.
Cheers, Paul


PAUL HEWITT
WD7S PRODUCTIONS
QRO HOMEBREW COMPONENTS
http://wd7s.home.att.net



----- Original Message -----
From: "Roy Koeppe" <royanjoy at ncn.net>
To: "Amps Reflector" <amps at contesting.com>
Sent: Saturday, March 06, 2004 10:11 AM
Subject: [Amps] Re: LK-500ZC problem


> Was stated...
>
> "It could possibly be a filament winding in the transformer that is
> shorted.  Here's hoping it's not the transformer!"
>
> Grounding the cathodes should only cause the idling current to read
> somewhat high, but not indicate backwards grid current.  (?)
>
> 73,    Roy    K6XK
>
>
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