[NJARC] Curious Hum

[Aaron Hunter]

Surprised the tube cured the problem.  Must have had an internal short.  
I was going to suggest a polarized plug.

I remember amps and radios that you would have to reverse the plug to 
get rid of hum.  I recently worked on a Victor VE 7-11 with a Radiola 18 
and an electric motor for the phonograph.  The Radiola 18 would 
"motorboat" until I turned the plug around on the motor.

Aaron

Phil Vourtsis wrote:

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>It was the 35W4. As soon as I replaced it I was good to go.
>
>Phil Vourtsis
>Pres. New Jersey Antique Radio Club
>
>-----Original Message-----
>From: njarc-bounces at mailman.qth.net [mailto:njarc-bounces at mailman.qth.net]
>On Behalf Of VOURTSIS, PHIL, INFOT
>Sent: Tuesday, November 14, 2006 5:29 PM
>To: njarc at mailman.qth.net
>Subject: [NJARC] Curious Hum
>
>Visit our web site - See http://www.njarc.org
>_______________________________________________
>
>   I just recapped another one of the cheap audio amps with the typical
>tube lineup- 35W4, 12AV6, 50C5. When I tested it after the recap it
>sounded
>fine until I reversed the ac plug. I got a tremendous hum that I could
>control
>with the volume control. Any ideas what could cause this? 
> 
>Phil Vourtsis
>Pres- NJARC
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