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Originally Posted by dtvmcdonald
The circuit should not run without a crystal. It is the tank circuit.
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Sorta what I figgered. Just wanted to toss the idea out there before nixing it.
Phil wrote,
Quote:
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Not sure what qualifies as "considerably lower"....but I believe I have measured anywhere from +249V to +270V at pin 1, maybe a little more.
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You indicated about 249V, which is down from the spec'd 280V, showing the tube is dropping about 30V across the 1K resistor (R250). That's .9 watt and the resistor would be running quite hot. If it is, you might want to sub a 2 watt resistor during the troubleshooting period.