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New Member here, but I spotted this post while searching the archives. Regarding this request about test modules for the 560 series scopes. There were 2: 3M1 (067-0500-00) to set the effective CRT

I think that would work fine, with the same signal quality as before. There is no need for symmetry but if you insist you might add a flip-flop in the final stage. Actually most fast pulsers produce

That's an approved Tek mod which became standard on later production. It's a current regulator for the tube heaters. Instruments with the mod have a more stable Memory Balance which doesn't have to be

How about using a few TTL gates in series since the output of the oscillator is already TTL? (As you noted, use the osc output to trigger, and instead of driving the TD from the osc output, drive it

That seller has several Tek plug ins that look like they didn't know about the release screw at the bottom. Looks like they pried them out with a crowbar.

If people don't bid it up. LOL! I might try to get it, so I have something to compare my prototype 1S1 to. I'm still deep in studying the schematics and theory of operation to uncover why literally

In order to view the trigger edge it would be nice to create a pretrigger pulse in the TD pulser. The simple way is to use the osc output as trigger signal to the 3T77A and an RC delayed version of

Yes, one of my 1S1s has that add-on board. It says 'Heater regulator' Board 670-1054-00 It has a 151-0148 on a heatsink Q609 but not mentioned in my manual 070-0475-00 Tim

I will try to clarify some things today; it'll take some time as it's involving access to display board area... TT

I noticed that too. My 1S1 doesn't have that board either, and it doesn't look very Tek-like. I was going to suggest it might be something to do with substituting for the 8056 Nuvistor, but that still

In the photos on eBay, I see a circuit board mounted on clips on the reverse side of the horizontal board, which I don't have in my 1S1 and that I haven't seen in pictures of the 1S1 on-line. I don't

One question on how to properly use the Cross Ref document... I'm looking for Q1544 replacement, in tek485 service manual, tek ref is : Q1544 151-0341-00 TRANS ISTOR : SILICON , NPN 07263 S040065 If i

Thanx Ozan, Will replace those components - I need to make some purchase so probably back on the air after a couple of weeks... Jose

Well, at least this one has tubes. I'll give it a try..... Thank You for the heads up. Mark

https://www.ebay.com/itm/CS-TEKTRONIX-TYPE-1A2-DUAL-TRACE-PLUG-IN-UNIT-TP714/193010214887 This thing looks like it went through a black hole and came back out a few times.

Good price, untested, but it has tubes. Sampling diodes seem to be there too. Perhaps this will end up on someone's bench who will try to get it to work?

If anyone's looking for one, there's a new listing for a 1S1 sampling plug-in. https://www.ebay.com/itm/Tektronix-Type-1S1-SAMPLING-UNIT/284211115843

I tried a 10 MHz oscillator, actually three different ones by two manufacturers, and all gave the expected 10 MHz output - but with a rise and fall time over 5 ns. The waveform did rise considerably

" I have not had to do this yet, but I have in the past ground down standard hex keys to get a more square profile in the bottom of the socket, and that has helped." I will second that! You must have

Thank you for the detailed explanation, Albert. I think I understand it now. So I'd need a much longer delay. 500 ns is about 350 feet of coax! Maybe I can use this sampling setup to help design a