Louis,
Thank You, but you should now turn this information over to the manufacturer
so they can ensure no new amps built are miswired and two issue a factory
bulletin with complete instructions for remediation. I'm no attorney but I
believe you've opened yourself up for liability if anyone attempts to follow
your instructions as you have not included a disclaimer in your message. A
radio operator might appreciate your infomation but a family of a dead radio
operator who tried to following them and failed may not be appreciative...
73,
dave
wa3gin
----- Original Message -----
From: "Louis Parascondola" <gudguyham@aol.com>
To: <amps@contesting.com>
Sent: Saturday, October 12, 2013 7:04 AM
Subject: [Amps] Ameritron AL-82/1200/1500 amps mis-wired!
For those of you who might have any of these amps, they are mis wired.
Seems that pretty much all of them going back quite some time. They are
not wired according to the schematic and therefore a possible shock hazard
is possible. One might assume that when interlock switch S5 is open
(cover removed) that there is ZERO high voltage in the amp. But due to
the mis wiring there is about 400vdc which is in the power supply and on
the tube anodes. I suggest you "CAREFULLY" make the test to your amp to
see if the problem exists. Simply remove the cover and turn the amp on
and look at the HV meter. If you get any reading other than zero, your
amp is mis-wired and you should consider wiring it properly. The fix is
simple. There is a blue/white wire coming from the contactor relay going
over to the step start relay at junction with R3. There is a wire on S5
(on left contact as viewed from front). These 2 wires need to be switched
to conform to the schematic. In doing so, th
e 400vdc with S5 open goes away. Although the manual states never to plug
the amp in with the lid off, I know many of us do troubleshooting and we
may wrongly assume that no HV is present when S5 is open. If you are not
qualified to make the repair, ask someone that is to do it for you. I
believe this is a repair that should be made to all these amps that
exhibit this problem. Please be careful in making the test or doing the
repair. Lou
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