[Boatanchors] Hickok 539B problem

[David Harmon]

Try replacing the tubes in the tester.


73

David Harmon
K6XYZ
Sperry, OK

-----Original Message-----
From: Boatanchors [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of
Yong Surk Lee
Sent: Sunday, September 21, 2014 6:40 PM
To: boatanchors at mailman.qth.net
Subject: [Boatanchors] Hickok 539B problem

Hello;
    I am repairing a Hickok 539B tube tester and it has following problem.

- When turned on it tests OK but if leave it turned on the test value goes
up to a few times the start up value. 
I left it on for a few hours and tested a tube. Tested value is a few times
higher than cold start up value. 

I have seen another 539B had the same symptom before.
Anybody has experience like this before??
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