![]() ![]() I guess the question comes down to if the power transistor is in a series pass role, does its beta make any difference, or is that more of a switching role? Since the passing of current is by degree, not all or none, I'm thinking the beta does matter, but that's where my ability to guess this ends. This leaves me with the only option of putting in a guesswork substitution, or not having the unit available to use any more, so I want to try with something.īut back to my question: if I replace this transistor (and it's not a regulator or FET or SCR) with a general purpose power transistor capable of handling sufficient wattage, does it really matter what I use? I'd post a picture of the power supply schematic, but my scanner has taken an unapproved sabbatical, and I have not found a source for this manual online. Sony brand, 1970s ID: RNF3XH (RF) old radio ID: EJ9CBF (RF) broadcast, radio, radio sets, pocket transistor radio Stern Berolina de Luxe, made by VEB Stern-Radio Berlin, GDR, 1971, ID: BBN91D (RM) Vintage red plastic transistor radio. multistage transistor amplifiers large signal/high power amplifiers. I've consulted all online datasheet sources I know of or could locate, online cross reference sources, and a foot-high stack of D.A.T.A., Sam's, Motorola, and TI catalogs and reference books, all without producing a single lead or part number even close to what I have. Radio Frequency and Microwave Electronics Illustrated Matthew M. I have one in an HP 8165A power supply, one of three in that role (luckily the other two look great on a transistor analyzer), all with parts list part numbers that start with the unit's model number, and end in three numbers in series, part supplier listed as HP, description given as "xstr assembly." All three are different transistors, two made by Motorola, and one by TI, with unobtanium manufacturer-stamped model numbers. Grundig high-end stereo - transistor radio, 1970s Sauvageot (242) 458.94 FREE shipping Westinghouse Transistor Miniature 6 Radio LeftoverStuff (1,150) 31.27 34.75 (10 off) Groovy Love transistor portable radio BizarreRelics (141) 40.00 FREE shipping 1960's Omegas Deluxe transistor radio, W/Original Box & Case TheImageArchive (42) 69. ![]() How critical are power transistor specs, for transistors used in a power supply, in what I'd describe in tube terms as a "series pass" role? This is the Internet Archive Radio Collection, a wildly diverse and massive collection of radio station recordings, broadcast captures, radio shows and. ![]()
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