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Old 20th Oct 2019, 9:42 am   #23
allan
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Join Date: Oct 2005
Location: South coast near Ringwood/Christchurch, Dorset, UK.
Posts: 230
Default Re: DIY battery eliminator for valve radio

I meant to come back on the fragility of high power IGBTs. Although they're very like high power valves (tubes.. to our ex-colonial friends), unlike the latter whose anodes glow a nice cherry red with a blue glow, IGBTs just explode. The thing that one can overlook is their quoted, sometimes miraculous, rating is good for 25 deg Centigrade and I've seen heatsinks that weigh in at 20 pounds to keep their temperature down.

I have the 1938 Westinghouse booklet with all the calculations needed to understand their practical use which I'll scan sometime, but it has over 40 pages so won't be done straight away.
Unless someone has already scanned it?
Allan G3PIY
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