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Howdy, ? Anybody here got a Tektronix 920 or 922 scope that they would part out, or perhaps any of the 900 series scopes to the extent that they are compatible???? I am looking for the input

You got wrong person my call is KD0MUY and don’t have any boards. Sorry for mixup wrote:

What junction voltage does it report in that diode test, and at what current? A not uncommon failure mode is extremely high base resistance (on the way to becoming infinity, perhaps), so some

q386 tests as a back to back diode on my tester,does that sound right?,also can you recomend a sub to replace it with ?,tia m3vuv.

Q386 has an open BE junction if there's no typo in that line. 2.6V VBE = dead. Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA 94305-4070

just tested q 376 out of circuit it says npn but only a beta of 13.

Heres what i measure in respect of ground q377 C=1.8v E=-2.1v B= -1.5v q387 C= 21v E= 9.4v B= 9.9v q376 C= -2.3v E= -5.6v B= -4.97v q386 C=9.5v E= -5.7v B= -3.1v

Repair complete! I ordered two: https://www.mouser.com/ProductDetail/594-MAL212516682E3 And finished reassembly of the plug-in after work yesterday. Ran through the check-out procedure in the manual,

I know you said earlier that Q386 and Q387 tested OK but the measurements you have made around Q360 do point to one or other of Q386/Q387 being the culprit. It is not easy to make definitive

q360 collector reads ccw -4.761 cw = -1.45 q360 emmitter= cw .47v ccw 1.125v r350=cw=.001 ccw=3.989 r360ccw=0.173 cw= 4.353 both measure 221 ohms.

heres some more measurments,at the junction of r354 and 364,i get 8.4v (should be 8.6v) q360 emitter reads 1.129v,q350 emitter reads 0.574v both should read 0.8v !

Paul, First time I used the serial function I thought it was not working either, until I realized I needed to scroll down to see the letters I typed. For RS-232 monitoring, I use the serial/state

Thanks Barry! I can paypal you some money for the board and shipping. I can email you my address or whatever you think is the safest way to exchange info. I will need to get your paypal send-to

Scrolling back thru old posts... This sounds like an interesting project. Did anything come of it?

Dave, Are these the same tapes (DC-300XLP, IIRC) that were used in many of the early HP desktop computers such as the HP-85? If they are, it's VERY unlikely that you will EVER be able to recover data

My mistake, I had meant to write TO-39 or similar, got confused. Anyway a metal can package as in many driver transistors. They have large radial heatsinks. Just wondering why. EJP

Dave, What you are describing sounds like sticky-shed-syndrome which is described here: https://en.wikipedia.org/wiki/Sticky-shed_syndrome . This has been well studied and documented in both vintage

I know that for some tapes - notably the older aircraft analog cockpit voice recorders - that specially modified reel-to-reel tape players were used to read the tapes. The concern with some of these

We have found at the museum that the issue mostly is the tension bands deteriorate so there is no drive capability for the tape. In addition, when it deteriorates, sometimes it pulls all the oxide

-------- For me it is usually based on analysis of the circuits. If you want to hear a more detailed answer please DM me and I can send you details on how I would approach guessing couple of test