[Elecraft] Wiring 101: I solved it, but why?

[Dave-KK7SS]

Tim,

Just my 2 cents worth.
A joint with some resistance can act like a rectifier. It could rectify the
small amount of 60 cps ripple (hum) that you have on the power supply and
pass it as modulation on the 12V line.
--
73 de Dave, KK7SS
"REAL Hams wind Toroids"
K2 #3003

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----- Original Message ----- 

>  (which by the way has always had a slightly annoying quiet hum
> or vibration in the P/S itself  - which I think all Astrons have?).
>   Thanks folks!
> 73/Tim NZ7C
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