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Old 8th June 2009, 06:33 PM   #41
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Join Date: Aug 2002
Location: Eire
If the tube is passing say 50mA and the bias point is about 20V, then that will be 1W of heat. Since we want them to be cool I would suggest about a 3W heatsink. I would advise mounting them all on the same heatsink to avoid thermal differences between devices which could lead to drifting currents. The heatsinks will stay very cool if in free air, but if mounted under the case they will quickly rise. My internal one sits at about 40-50 centigrade. If the case allows it, I would suggest using the case as the heatsink.

Normal electros are fine, bypass them with some nice quality film caps straight between the valve cathodes.

Shoog
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