High Screen Voltage

[Mike Hardie]

Carl,
Did you try tube substitution with known good one(s)?
Mike VE7MMH


----- Original Message -----
From: "Carl C. Miller Jr" <bugmarx at ev1.net>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Sunday, September 15, 2002 9:38 AM
Subject: High Screen Voltage


> Hello All,
>
> I have a problem similiar to the gentleman which posted concerning his
IG-72
> audio generator. I am working on a non-Heath receiver and the screen
> voltages on the RF amp, and both the first and second IF amps are about
> 50-60 volts above normal. The plate voltage is a little high but not
> extremely so. I checked the screen dropping resistors and they are within
> specs, but there is not much of a voltage drop across them. So, obviously
> there is not much current being drawn. What effect would this have on the
> sensitivity of the receiver, performance etc.? The receiver seems to work
> okay, but not quite as sensitive as it should be. Could it be that contact
> is not good at the tube socket or could there be some other problem? As
> always, any help appreciated.
>
> Carl KA5KAB
>
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