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Hello Nick, I have at least the following : - Phase gate Assy : PN 119-1010-02 - Power supply with GPIB : PN 337-2553-04 These parts were OK when saved as parts some years ago I must check

Hello, I have at least the following : - Phase gate Assy : PN 119-1010-02 - Power supply with GPIB : PN 337-2553-04 These parts were OK when saved as parts some years ago I must check tomorrow

Yes, if available and that kind of accuracy is required. Peter

If one is going to insert a diode, one would probably be best using a supply with remote voltage sensing.

Adding some information to this discussion: The Tektronix part number for the BNC Tee is 131-0416-00. This is the Tee that Tek used in their cables; the ones that I have are in Amphenol packaging

Apologies if this is in the wrong place, direct me and I'll move it. I'm rebuilding a 492BP using parts from multiple other units and currently short of some vital bits. I need a preselector and

I really just need the two draw catches. No luck finding something modern, all are too long. It's for a cherry 422 that I got 45 years ago.

L257 is not critical, you can get a higher value if you want - not lower. Make sure the current is equal or higher than original. CR261-268 can be replaced with 1N4937. These are 600V 1A very fast

In that case, they would have used a capital U as the closest match to a mu. That's the sort of thing that was common in the ASCII monofont days of yore. -- Prof. Thomas H. Lee Allen Ctr., Rm.

If the capacitors in my list have no ESR/Ripple current ratings specified, you can use any general purpose capacitor. You can use capacitors without ESR rating as you mention without a problem. The

That very interesting. Mine's a B190000+ so that explains why I have the 1.8k. I still like the shorter characters and will likely either replace it with a 953-ohm or leave the 2k parallel

In the olden days, M often stood for milli for inductors, but meg for resistors, and micro for capacitors (so that MMF would mean a picofarad --? a "mickey-mike"). Not confusing at all! ;) So, you

The Tek 212 service manual is capitals only in the parts lists. I assumed that MH meant micro Henries in this case.

Sorry, I assumed that MH in the caps only world of the 212 Tek service manual was micro Henry, not milli Henry.

Hi You're still confusing milli and micro. You'll want to straighten that out sooner than later. 1.8 MH is 1.8mH is 1.8 millihenries -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 420 Via Palou

Here is a picture of the amplifier board: https://flic.kr/p/2pnbH9C This board seem to have cleaned up pretty well with the following three exceptions. L108 and L111: Both we're encrusted with

There was a mod on Beaverton built 7704A's which changed R3468 from 953ohm to 1.8kom. This is opposite to the Guernsey change. So either the Guernsey mod sheet is wrong or for some reason they changed

That looks like a simple 2-sided board. Should be easy enough to verify. As for replacing a 2.2mH inductor with 2.2uH inductor, no, don't do that. --Tom -- Prof. Thomas H. Lee Faculty Co-Director,

MH is millihenrys, uH is microhenrys.

Here is a picture of the power supply board: https://flic.kr/p/2pncZDr Question: Is it even worth trying to fix this board? I am worried about damage than may not be visible. I don't want to put a