Trouble with Ameritron AL-811H Oscillating!
My new AL-811H oscillates on the highest 3 band switch positions--20, 15 and
10 meters. This is without exciter drive. Plate current goes from zilch to 300 mA and grid meter goes NEGATIVE. This is a grounded grid design with four 811 tubes in parallel. Power output as read on my tuner also shows RF is being generated (what frequency, I can only guess). This problem seems to be new after switching the primary to the 240 V configuration, which incidentally boosted the plate from 1600 to 1800 V--perhaps too much for the 811 tubes? I contacted Ameritron and hope to hear from them this week. Has anyone had the same thing happen? |
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