#1
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Hickok 656XC number 2
Got the other one today, paid $100 with a box of tubes to boot. This one is in much better condition than the last one, but has a shorted filter cap or something- the mercury vapor rectifier tried to flash over on me when I variac'd it. I'll replace the cap, and pray those precious crystals are still good...
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Evolution... Last edited by miniman82; 01-13-2015 at 01:30 PM. |
#2
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Replaced the multisection cap, got it up to full power. A section of the video phase splitter tube (12AV7) started red plating, found cathode voltage was very low (swung under the grid) because the matched plate/cathode resistors had drifted from 1k down to around 100 ohms. They will need replacing before going any farther.
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Evolution... |
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