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Steve, Check the 151-0402-00 transistors. These are the same number as the 151-0367-00 3571TP. These are likely leaky. I had a triggering problem with mine and these transistors were bad from C to E.

Hi, I have several Tektronix scopes. My newest one is a TDS 684A, and I have posted about it before. I found it in a surplus place, and I had been wanting to pick it up for a long time. When I brought

After 45 year, I can still her that sound again. No. This is not a translation of Bizet’s Les pêcheurs de perles. That distinctive crunch was an immediate indictment to all the someone has abused

Dan, did you ever get round to trying your proposed fix of increasing the C841/R841 time constant? I can confirm that the 7934 mainframe also has the issue. See two photos

The 576 uses some Printact relays. Ed

Ondrej, Note where the pots R863, R1226 and R1228 are and turn them back and forth. One or more may have a open due to not ever being moved and turning it restores contact. Check for B+ at places that

We will have closure to this thread/story now: I ordered 25 x J300 (NOS?) from BGMicro after previous poster pointed out they had some...hoping these were real/NOS...because no photos of markings on

Interesting comment. Which type of female Type N connector would you use on a type 106 where it’s mounted/soldered directly on the high-rise board? I’m looking at all the best options available.

2N3958 Followup: Looking at the 2N3958 datasheet, I see that the 2N3957 and 2N3956 are better matched versions of the same dual JFET. I find a few of them, at increased prices on ebay, but none in

I checked, and the 2N3958 is in stock at Mouser for ~$13 each. There are lots of offers on ebay between $3 and $10 each, almost all from Asia, and better offers if you care to buy 3 or 5 at a time.

Hi Dennis- I've made two flexible 7000 series extenders based on using salvaged back plane connectors and a couple of circuit boards I had made. On the donor board, I just removed the plastic

I see some comments about changing existing GR874's in Tek gear for BNCs with some loss of performance. I think a better and certainly easier mechanical change is to female type N connectors, which

The -5V power supply board can be removed from the main PCB, and then re-installed perpendicular to it, to allow access to components underneath. (There should be three spare sockets on the A8 board

I can't comment on the 7603 backplane...I don't have one handy. But I can recommend the Hakko FR-301 desoldering gun for delicate multipin component removal. Early 70's coin op mainboards have very

I recently brought my 7D15 out of storage and found that when plugged into the 7704A it took down the display. A second insertion in to the 7704A brought some smoke, quickly identifying the bad

This is flipping correctly between -06 and +05 I noticed when I move the picture all the way to the left in 521 mode there is something on the screen but it's all crooked

50 is beautiful with 2mV of ripple

Ok better observations A sweep is actually spot on time wise B sweep in the positions 10uS to 0.2uS is showing it 10x wrong So 100nS is shown as 1uS In positions 0.1uS to 10nS it displays correct

Another lot of 125 ohm connectors on ebay: 333925686202

This should be correct for your scope. P834/P835 affect the hold-off timing at fast sweep rates: approximately 1.2 us when set to "7800/7900", and 2.2 us when set to "other". The choice of delayed or