Jim, no, its not a common problem with that amp, but that keying circuit is
quite simple. The stand by operate switch may have gone bad and it is broke in
the stand by mode. Does the red transmit light come on? It wouldn't if the
switch is bad. There is sensitive connections at the xmt light and a place
where the wires can easily break have a look there. DO you have an older model
with the 3pdt open frame relay? If so, maybe the coil opened up, maybe the
snubber diode shorted. Can be any number of things, but it is a simple circuit
to trouble shoot. Another problem, rare but possible is a problem on the
timer/OL board. Maybe the grid trip circuit shorted and is holding off the
power to the relay switch. This all can be determined with an ohm meter by
taking some voltage readings. You just have to follow the path of the relay
voltage and see where it stops.
-----Original Message-----
From: Jim Klein <k7rdx@charter.net>
To: Amps group <amps@contesting.com>
Sent: Wed, Feb 6, 2019 8:51 am
Subject: [Amps] AL-1500
Working on an AL-1500 that will not key up after time-Out delay for tube
heater warm up. Plate voltage comes up but keying circuit does not
activate.Is this a common problem with this model of amp?
Thanks,Jim..K7RDX..
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