As a troubleshooting technique, you can plug in one pass transistor at a
time and the power supply will work so that you can measure voltage on the
output. I have had strange things happen to an Astron 35 which has included
a single pass transistor shorting out, a resistor in the reference voltage
divider increasing it's resistance and causing the voltage to drop to about
8V max. Good luck. I've got one that took a power surge last spring during
a lightning storm and I haven't found the problem yet. I just bought
another one.
de WD7F
John in Tucson
----- Original Message -----
From: "motarolla_doctor" <[EMAIL PROTECTED]>
To: <Repeater-Builder@yahoogroups.com>
Sent: Tuesday, August 31, 2004 1:02 PM
Subject: [Repeater-Builder] Re: Astron Supply Help
> reinstalling the TO-3 mount
> pass transistors with a thin flim of heat sink
> grease on the insulator and mate surfaces.
I use the clear heatsink "grease"
Also, I allways add a star or shake proof lock washer on each pass
transistor mounting screws. This helps keep the transistor
collector and the socket in good contact under hot conditions.
replace the entire reg board with Skipp's upgraded circuit.
This helps too.
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