Brett -
I'd start by disconnecting ALL cables between the two units.
If you still have hum. Most likely you have a bad filter cap in the
receiver. You could try connecting a suitable capacitor across each
section of the electrolytics, (watch the working voltages.) Clip leads
are fine, lead length isn't a problem. Exact capacitance value isn't
that important, something close (+100% / - 30%) will at least let you
know. A single section bypassed may not kill the hum entirely, but if
it knocks it down considerably you may have more than one section bad.
If you need new caps, Tom at <www.hayseedhamfest.com> has new
manufacture caps that are an exact fit. If even one section of a multi
section can is bad, replace the entire unit. In fact, I would recommend
getting Tom's "kit" that replaces all electrolytics. The ones in there
are all at least 30 years past their "expected" life.
Let us know what you find!
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:
Posted bad info on my question. The Receiver has a hum and constant
signal of 4 S units with transmitter off. 9+ with it on. I think it
may be the power supply?
Thanks,
Brett
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