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Sometimes You Can't Win

Well, the joke's on me. The "transistor" on the back wall is actually a 5-leg PWM controller. There are three versions of the part; "L," "M," and "H." Mine is "M," which means (what else?) the frequency is fixed at 66 kHz. I could buy the 100 kHz "H" version (actually a KA5H0265R) on eBay from Hong Kong or Malaysia, but that doubles the cost of this little switcher. Guess I'll just have to resign it to my original intended use of DC for my 12SL7s. Proving that higher frequency ultrasonic heating is feasible will have to wait for another day.






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