Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Patrick -
First thing to check is the Bias supply in the AC-4. Red Final plates
indicate loss of grid bias, regardless of any other setting.
Less likely possibilities are a heater-cathode short in V13,
leaky/shorted C61 or shorted feedthrough capacitor, all a LOT less
likely than Bias supply problems.
If the filter capacitors in the AC-4 are original, the easiest "fix" is
to replace them ALL with the AC-4R repair kit from Mike Bryce at
<http://www.theheathkitshop.com/drakeac4rreplace.html>
73, Garey - K4OAH
Atlanta
Drake B & C-Line Service CDs
<http://www.k4oah.com>
pmertens wrote:
pmertens <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Hello everybody,
I am the proud owner of a Drake TR-4 in excellent condition and that I
was using once a week
for a vintage Rig QSO here in Europe.
Last week, after the qso, my Drake TR_4 suddenly showed a strange
failure:
when I stop to transmit, the relay is switching, but the rig stays in
transmission. No power is coming out and
of course the finals tube are becoming immediately red ! So, it seems
that the antenna is switched in reception mode, but the finals are
still in transmit mode with no power output on the antenna. This is
happeningh in all modes except AM.
This is not a VOX or anti-VOX problem as I was deconnecting the
microphone but the problem still persist.
SO, to be short:
- when I switch on the rig, reception is OK
- when I go into transmission mode, this is also OK
- when I stop transmitting, the power output stops but the rig stay
internally in transmitting mode, although the antenna is disconnected.
I have no longer reception .
Hope this clearly describe my problem. Is there somebody on the list
able to help me indentify this problem ? Or already
having this problem ? Before doing anything inside my immaculate rig,
I would like to have an autorized advise.
My website where you can see my Drake TR-4:
www.on4ny.be
Thanks for help,
PAtrick - ON4NY
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