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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

It pays to be methodical (though, in this case, the one getting payed appears to be Mouser): I went back and measured the voltages coming off the (unreg) power supply, and the +40 V rail is also very

Desperate measures for desperate Techs: Take one slightly undersized or worn hex key. Place tightly in vise grips, business end pointed up. Apply oxy-map gas or acetylene flame to tip until cherry

BGMicro has NOS J300s for about $0.62. I checked the data sheet; it appears that J300's came in various versions: J300A, J300B .....J300D. The difference is the Idss range and gate-source cutoff

HI diode: Well then... ur not in CONUS... or u don't hang out at the garage. -- Roy Thistle

Well since Im the OP ill update... This week sorting parts I fell upon a 2n5458 (NOS) that looks close to J300 specs...lets recap & quickly clear up stuff... *Scope arrived to me with prob with ch A

Siggi wrote: I think that the per-color part of this is probably explained by the order of the color shutter actuation, but I can't quite make it make sense either. If we simply had something that was

[email protected]> wrote: I beg to differ. Try to switch that particular signal to one of the other channels, my $0.02 says the trace dropouts will follow the trace color.

Hi Siggi, No, the blue trace is not compromised, but your observation is correct; the scope is set to display vectors, not dots, therefore, from time to time a vector might be missing because there