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RE: The two thick pins are the heater. .

Either you have poor contact between the probes of your DMM and the tube pins or you (unfortunately!) have open heater circuits in the tubes themselves.

If you put both probes on the SAME tube pin you should get readings of zero or very near zero resistance. If you are still getting high resistance readings like you have now, it means your probes - one or both - aren't making good contact with the tube pins. Try this on both of the fat pins so you know you can make good contact on both of them.

Please post your results.

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