Brett -
I don't recall if I mentioned this earlier, but I would strongly
recommend that you replace at least the Bias supply capacitors in the
AC-4. A failure of the Bias supply can fry finals, associated circuitry
and even cause a fire, even if the transmitter is in Standby. Better
still is the AC-4R upgrade kit from <www.theheathkitshop.com> , which
replaces all active components of the PS except for the transformer and
Bias pot.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>
Brett Forehand wrote:
Gary, thanks for the input. I got thinking last night.... obviously
the power supply powers the transmitter, and the receiver can be
"stand alone" with it's own power source. So, I did pull all the
cables. Thought I found the culprit until I realized I had just
unplugged the speaker. Haha! The noise goes to nearly 20 on the
meter when I switch on the External Mute or the Noise Blanker. It is
at about 4 S units when in normal operating mode. NOTHING changes the
sound/signal when moving any of the switches, PTO, tuning knobs, etc.
I will check into the cap kit. That's a smart move anyway.
As far as any good news goes, I received new final tubes and the
transmitter is at full output!
73,
Brett
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