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. Map Diagram Simple Circuit Radios Electronic Schematics Receptor Diy. 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. 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. I know from my work on synthesizers in the 1970s that I did not like the sound of. 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. 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. 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? Vintage Philips MW-PO Transistor Radio 1970s Collectable AU 45.00 AU 16.00 postage AWA B107 Vintage Clock Radio / Japan AU 43.95 AU 15.95 postage PETIMAX ELIMINATOR FOR TRANSISTOR RADIOS ORIGINAL IN BOX (NEW) AU 30.00 Free postage or Best Offer Terris transistor radio - 1970 AU 150.00 AU 15. Vintage 9ct gold 1970s Transistor radio charm OrangeSkyVintage (71) 78.86 1970s White Toot a Loop AM Radio by National Panasonic - Space Age Design - Wrap-Around-Your-Wrist Portable Transistor Radio thelittlebikers (239) 126.42 Vintage Radio Receiver Super Sound Portable Transistor TheVintageEurope (1,207) 48.
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