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RE: Would you mind...

My only experience with these has been with Dale aluminum-housed, heat-sink types.

These generate a lot of heat in free air with very little power thru them. It amazes me how little it takes if there is no heat-sink.

If you're using a chassis as a heat sink, you are heating that part of the chassis more than other areas. This heat-created area is different in density and temp from other areas.

The heat differences aren't conducive to max. performance of the chassis as a neutral device.

Magnetic fields also differ in the heat-sinked and non-heat-sinked areas.

I do not know all of the possibilities for mischief from this-- but common sense tells me some of them. The difference in sound quality between a uniformly made and operated chassis, and one that has different anomalies in either its construction or in its activation induced from various influences on it-- heat and magnetism in the wrong places being only two of them-- the difference in performance of the circuit is obvious when you're comparing amp A- to, say, amp B-- one with a proper-operated chassis and the other with one or more of these problems-- is evident on listening.

Perhaps someone here would care to elaborate on this-- I'm afraid I have only partially answered your question.

Rest assured that this anomaly DOES EXIST if you allow it.

I have used chassis-cooling for FWB's in low-volt power supplies with very few problems-- In these cases, I used Wakefield aluminum coolers bolted onto a chassis bottom that was also aluminum-- the chassis bottom had been cleaned and as much as possible, the aluminum heat sink bonded with it.

As voltages get higher (as in tube plate supplies, etc.), I would tend to avoid letting any part of a circuit get anywhere near a metal chassis.

This attention to detail is far more important in a S.E. amp than it is in a Push-Pull circuit.

---Dennis---



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