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RE: Resistor dissipation Question

If the Dale is enclosed in an aluminum casing, with two tabs on each end that allow you to mount it, and has some cooling fins, it is ONLY rated 50 Watts when properly heat sinked to a chassis or sufficient material to "sink" the excess heat into. Without the proper mounting, it is no wheres near 50 Watts rated. Most likely it is 20 Watts maximum when not heat sinked.

There is a white paste you use, (thermal grease or heatsink compound are common names), applied between the resistor and the chassis contact area, to more easily transfer heat from the device to the heat sink area.

Often, the type resistor I describe is called a "chassis mount" power resistor.

If this resistor is reducing B+ to the output tubes, there are far better ways to accomplish this, but that is another story for another day!

Jeff Medwin



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