[NJARC] Buzzzzzzzz

[H Klancer]

Scott Roberts wrote:
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> Hi Everybody!
>
> Here's the latest issue I'm working with...
>
> A Motorola Model 61A, AM radio. I've already recapped
> & re-resistored it (I did not rewire this one! I'm
> learning!!! lol)and there were a few previous "bodges"
> put in by an earlier owner, which I cleaned up. One is
> an electrolytic with 2 of the 40mfd lines running over
> to one tube,(25Z5, at pins 3&4 cross link) the third
> to another(6D6, at pin 3) and the ground a capacitor
> going to ground at the on-off switch... Without this
> cap, the radio plays nothing... There is also a switch
> on the back panel which was added, I am not quite sure
> of its function...
>
> Anyway, it is receiving well- at 3am I was pulling in
> WHAM 1180, Pittsburgh, WWVA 1170 Wheeling WVa, and
> 1140 WRBA Richmond, Va., among others. However, from
> 700 down, there is an ever present buzz, and a minor
> hum throughout the whole range. Could this be due to
> electrical interference, dirty tuning capacitor(I
> spritzed with RS cleaner) etc.? Would my isolation
> transformer reduce the possibility of electrical
> interference?
>
> Any ideas?
>
> Thanks!
> Scott
>
>
>        
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>   
:Hi Scott,

Well, all of my radios buzz zzzzz below about 740 or 730 or so. I don't 
know exactly what devices
in the house do it, but it's a common problem.

Maybe light dimmers, or florescent lights or - something. One of these 
days I'll track it down.

Meanwhile, you're not alone.

                       Harry K