Yes, further searching reveals that although the 2n1038 is T05, the -2 version is X26 - mounted in a stud by the factory. So it could well be glued. 2N1038s aren't unobtainable though, so I'll keep it original if I can. Even though a 7915 would be fine !
I was a bit puzzled by the insulators. Very metallic-looking. Then I realised they're BeO. Pretty unusual these days (no, I won't be machining them) so another reason to keep a T05 in there. On Sun, Nov 6, 2016 at 10:46 PM, djl <[email protected]> wrote: > Just homemade opto-isolators. Used in choppers, too. The transistor was > indeed bonded to the heatsink. Just replace the whole thing with a > 3-legged regulator? or simply a modern PNP t0-220 with a little heat sink > on it. > 73, Don > > > > On 2016-11-06 15:15, paul swed wrote: > >> Don't know what to say on the transistor. It may have been actually made >> that way. They did lots of things back then. Yes familiar with the bcd >> decoder its used in the 5245 class counters also. I think someone was >> doing >> some funny stuff at lunch time to come up with that. It was the 60's after >> all. >> How about some pix of a 9815 calc. That would be pretty neat. >> On really old stuff if you can't find the part needed its pretty easy to >> replace the whole function with modern answers. I know it sort of breaks >> the original mode but for me at least its a case of getting it going. >> Regards >> Paul >> WB8TSL >> >> On Sun, Nov 6, 2016 at 1:59 PM, Adrian Godwin <[email protected]> >> wrote: >> >> Slightly off-topic, as this is a general repair question. But it's a TIC. >>> >>> I'm repairing a 5275A timer (all-discreet count logic to 100MHz, neon >>> bulb >>> display, a most amazing bcd to decimal decoder made from neons and LDRs, >>> 1-2-2-4 decade counters ..) and the current problem is a 2n1038-2 >>> germanium >>> T05 transistor in the power supply. >>> >>> It's mounted in an aluminium bush which is then isolated from the >>> chassis. >>> I don't think the bush is also a collet but I can't see how to remove the >>> transistor. It resists ungentle pushing .. should I push it with a >>> hammer ? >>> Or is there a kinder way ? >>> >>> (I'm hoping to eventually put this into a system with a 101A oscillator >>> and >>> a 9815A calculator to measure the ADEV of a Boule electric pendulum >>> clock). >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to https://www.febo.com/cgi-bin/ >>> mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/m >> ailman/listinfo/time-nuts >> and follow the instructions there. >> > > -- > Dr. Don Latham > PO Box 404, Frenchtown, MT, 59834 > VOX: 406-626-4304 > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
