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I need help finding 2 NPN Transistors PART # 151-0830-00 for Tektronix 2246 Oscilloscope. Both Q305 and Q306 are shorted and I do not understand why both should be shorted E to B. I can understand

Thank you all for the replies. The value read was 1.14M Ohm. Please forgive my typo. Regards, Roger

As I recall, "T0" is +/- either 50 or 100 ppm/C. These "T" numbers have been standardized for a long time. You can search around for the terms and find tables that lists them. I think T16 is the

David, from the service manual, the manufacturer part number is 5053RD1M430F which suggests 1.43 MegOhm. If it were 1.43 milliOhm then it would have drifted an awful lot to read as 1.43 Ohms now, and

R569 MegOhm or milli-Ohm? TC=T0, just means zero temp coefficient or close to. D.

Really? 43,000,000 Ohms specified vs 1.14 Ohms measured? If so then WOW!

If those parts are removed then there's NO TELLING what other parts are missing or bad. Parts for these are generally only available used and on FleaBay and the asking prices are usually insane.

Matt If there is no shaft coming out of the hole this could be a small missing part or a very LARGE missing part. This is a 2 layer shaft that is coupled directly to the isolated collector supply. So

Hi, I’m considering a 576 curve tracer that has a missing max peak volts knob and no shaft coming out of the hole. So presumably there are also some missing parts inside. How feasible is this to

Albert, I think I fixed the x1 and x10 horizontal issue. I can now quite dial them in. The problem was that the contacts of the x2, x5, and x10 wafer-switch were very dirty. Even at zero, the

I see Stephen. It's good to set R544 and R566 first and do steps 24 and 44 after that. Steps 24 and 44 have no effect on sweep speed, only on sweep length. Albert

Dear All, I am trying to fix a Tek 577 for some time. After a LOT of work I think I have been able to fix all major problems of the unit and go through the calibration procedure. One minor issue I

I remember when I was in that situation, Facebook Marketplace cured that symptom. Anyways, amazingly there are many that might be in your local area that don't advertise the best that might even

Murchison, I thought that I had checked the bridge rectifier (CR10) for shorts, but either I had not, or I had not made good contact when doing so, because now I see that two terminals are

Have you checked CR10 for shorts?

I didn’t get to that point yet. I’m getting ahead of myself. I was just monkeying around with R544 and R566 to see if they had any effect. Many things were bad in this scope. I changed several

Hi Stephen, Which pots do you mean? Sweep lenghts are determined by internal trimpots in the Miller run-up circuits, calibration steps 24 and 44. Is time/div OK or also expanded? Albert

Hi Albert, Will do. Thank you

On Wed, Apr 13, 2022 at 01:00 AM, Brenda wrote: Hi Brenda, Interleaved. > Hi Steven, > > I do not have a 547 yet myself, but from what I have read is that one of the > main signs was that the

Search or "547 V800". Albert