My heat sink resistors measured 82 degrees C. The big NPN measured 47-49 degrees, while its PNP sister measured 54- 56 degrees C. In a test setup with a dummy load, I applied a 1 KHz signal to give 20 Watts output in the DSO & left it that way for 24 minutes ( a torture test ). The additional bolt presses the heat sink & sheets firmly onto the main board - and lowered BJT temperature 3-4 degrees C more than without the extra bolt during tests.įor my 21 W amp, this crude heat sinking worked OK for this, my first solid-state guitar amp. The copper sheeting + aluminum heat sink is secured to the main board with the main power transistor mounting bolt plus an additional 6-32 bolt below each transistor. ![]() Further, under each heat sink lies a small piece of 24 gauge copper sheeting and under that lies more 24 gauge aluminum stock. ![]() I bent ~ 20 gauge aluminum with a brake to fashion crude heat sinks.
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