[R-390] Re: R-390A Problem

[Tim Shoppa]

<jdkopke at cablespeed.com> wrote:
>      Hello  ,  My  Receiver [Amelco # 1852] developed a problem recently
>      ,stro?  intermittent distortion wipes out audio  [It is a strong
>      buzz?g  noise like when you put a headset plug in halfway].When
>      this  happens  th?carrier meter pins to  the left . The receiver
>      functions  as normal o?erwise ,no band setting or other function
>      seems to matter . Maybe this is
> simple problem that can be fixed
>      easily . Thank You

I've experienced the same thing - intermittent 60Hz hum that greatly
reduces sensitivity but makes loud buzzing noises. In my case it was
a 5814A (actually a modernish "JJ"-brand 12AU7) with an intermittent
heater-cathode short and I could induce it or make it go away
by tapping on the tube. It was in the IF deck.

Tim.