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RE: More questions regarding voltage regulator tubes

The load is the primary of an interstage transformer. Unfortunately there is not room for another tube. Also after several hours of operation the heat builds up to the point where the top of the chassis is very warm. I've tried drilling ventilation holes but seems to make little difference. I'm concerned I am cooking the other components inside the chassis so I will probably remove the VR and replace with a dropping resistor which by my calculations should only generate about 2 watts of heat.

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