G'day Jeff,
I'm sorry if I'm being too obvious. I don't know the Alpha
78. Does it have 2 tubes? If so, what happens when you swap the tubes in
their sockets? Does the fault follow the tube or does it stay with the socket?
73 mate,
Alek. VK6APK
At 01:17 PM 06/15/1999 -0500, you wrote:
>
>I have an Alpha 78 that one tube occasionally goes "cool" in, as if the
>filament isn't on. Then it
>will come back on and put out full power. Hard to say what causes it to
>change from OFF to ON.
>It just turns on one way or the other at start up. A good smack to the side
>of the cabinet can
>bring it back ON too.
>
>I have pulled the tube out to clean the pins, which looked okay.
>And I used a round toothpick to clean the socket contacts. Seems like that
>helped some, but occasionally
>the tube in question will still be cold at turn on.
>
>Ideas?
>
>Thanks,
>Jeff N5TJ
>
>
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