Not being an expert, two questions occurred to me.
1. Is the power supply wired for 230 v or 110? If for 110, and you apply 230,
not a good situation.
2. Inspect the bias supply in the power supply ensuring the diode(s) are good
and the capacitor is not shorted.
-----Original Message-----
From: cnixon <cptc...@flash.net>
To: drakelist <drakelist@zerobeat.net>
Sent: Wed, Mar 12, 2014 1:54 pm
Subject: Re: [Drakelist] What have I done now?
I may get disagreement on this but I would NEVER bring up a PS like this
attached to a transmitter.
When you do that, the bias is minimal, and ven at low plate voltage,
the finals are going to be conducting I suspect. Really hard to tell what
is going to be happening. If you want to bring the supply itself up
slowly, thats fine...THEN attached the rig and power it up normally.
Curt
KU8L
A line, B line, TR4 TR3, TR7
On 3/12/2014 12:18 PM, Damien Mannix wrote:
Hi all,
Still waiting for better weather to put up an antenna but then
ready to go with my TR4/AC4 which are fine into a dummy load, or at
least they were!
Bought a, supposedly good, AC4 as a spare. Decided to power it
up gradually with the TR4 as a load. Two hours at 50v, two at 80v, two
at 110v, two at 140v. No problems and a fan on the rear behind the PA
begins to run at this voltage. Then, ten minutes at 170v and 'wow' what
is that smell? I thought it was my shack heater.
No it was the TR4. The top, above the forward most PA tube, was
unbelievably hot. Switched off immediately of course.
Can't spot anything untoward in the PA compartment so after a
complete cool down I took it slowly up to 230v with my usual AC4. Not
done a full test but it seems perfectly happy again, heat and smell
wise, after 30 minutes at 230v.
Might I have ruined anything and, presumably, the fault is in
the AC4.
Thanks in advance for any thoughts.
73
Damien G3XER
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