I'm looking for six transistors from a HP 6269b. The originals are marked 4 458
RCA
HTN 8010
and in the manual they are just have a manufacturer code of 60675. Is there any current equivalent or close match avaliable? Anyone know the specs on these transistors? I couldn't find any info, so any help is greatly appreciated.
Thanks, Steve Kamego
I looked in the published HP xref and it skips from 1854-0453 to
1854-0459 with nothing in between. But that was published in "Bench Briefs" June-August 1981, and your PS could've been made long after that.The 60675 probably means it's RCA, which is usually in a list of mfgrs in the manual. But you already know that because it's marked RCA, obviously.
If you can determine which it is, NPN or PNP, and what the maximum voltages are, then I or someone else here could give you a part number that will probably replace it. It's possible that it's a darlington, or if it was made more recently, a power FET. But if you have a schematic and it shows a transistor, then it narrows the choices down a lot.
It's an NPN, and as far as I can tell it's just a transistor, not a darlington. In the schematic it's listed as a single transistor. The output of the supply is 0-40V nominal, 50V max, and 50A nominal, 60A max. It has six of these transistors to regulate the output, and has a quite large pre-regulator to vary xformer turn on times. Because of this, I really don't know what the transistor will "see". However, they may still not be the problem. I was just hoping for a simple replacement so I could rule them out. Thanks for the reply, Steve Kamego
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