HELP WITH HEATHKIT SB-634

[Murray Grandy]

I HAVE SUBJECT ITEM PURCHASED ON EBAY. IT WAS ADVERTIZED AS SEGMENT “F” NOT WORKING ON ALL SIX DISPLAY TUBES. I FOUND A 100K RESISTOR OPEN IN THAT PART OF THE CIRCUIT. I REPLACED THE RESISTOR AND ALL SEGMENTS ARE NOW WORKING EXCEPT ALL SIX NOW ONLY HAVE A SMALL PORTION THAT IS LIGHTING. THE ENDS OF EACH REMAIN DARK AND THE CENTER PART LIGHTS UP TO A LENGTH OF ABOUT 1/8”. I HAVE REPALCED THE TRANSISTOR (Q101) WITH SEVERAL OTHER GOOD ONES AND NO JOY. MY QUESTION IS, CAN THIS HAPPEN TO SIX DISPLAY TUBES AT THE SAME TIME? SEEMS DOUBTFUL BUT DON’T KNOW WHAT ELSE IT COULD BE. ANYONE OUT THERE ANY KIND OF EXPERT ON THESE DISPLAY TUBES?

MURRAY

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