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Hi, I followed this discussion for a while. I have a 1A1 manual series no. 20000 up with FETs in the input stages. The circuit between the CH1 input and CH1 output is only supplied by the -150V,

We are all seating here praising Tektronix superior designs and at the same time listing lousy design practices. I think where we are going wrong is thinking of old tube scopes, which really were

The connector/cable that I was thinking of, one put out by Hughes, was named 'Gold Dot', that name flashed back while reading your mailing. Apparently, that was a reliable connector. The penny

Hello Jose, I'd recommend Stan's book, it's an excellent guide to the Tektronix range of scopes and associated equipment with advice on traps for the unwary and difficulties likely to

JOSE V. GAVILA (EB5AGV/EC5AAU) wrote: At the Vertical Signal Out you should see a sample of what appears on screen. The amplitude should be about 2 volts per centimeter of vertical screen size.

Hi Jose, I would agree that it looks like a power supply problem. You should be able to find the test points for the power supplies on a ceramic strip on the upper chassis toward the rear of the

Miroslav Pokorni wrote: OK. I guess there seems to be enough interest in this. One of my first tasks right after being given the job as the Tektronix Spectrum Analyzer Sales Engineer in the

Hello Jose, It sounds like you might benefit from a copy of my book: "OSCILLOSCOPES--Selecting and Restoring a Classic". You can read a review of it on my web page at: http://www.reprise.com I

Hi Jose, there I without Power supply ripple is an uncommon fault in my experience of the 530/540/550 series. It sounds like the 1A1 may be the cause of the problem. There were 2 broad versions

I have two busted Tek DC508 counters, both with the same irritating problem, open segments on the LED displays. so many, that you can't tell what it is displaying. this was a nasty part from

Hello! I have been working a bit more on the oscilloscope, based on your comments and my very own ;-) ideas. Well, almost everybody agreed about a power supply capacitor trouble causing the trace

Hi, Jeff, What you have is a normal artifact that is found on any Tek scope that has a CRT with an internal scan expansion mesh. This mesh is in the 485, 465, 475, 7000-series, 2200-series and other

Dean; I became aware of the disappearing contact leaf problem during one of the teardowns to try to fix the intermittent. Thot I finally had it fixed then. Did'n't, & still don't. Cute li'l bugger

Hi Jose, It looks like the power supply isn't regulating properly and has ripple on it. I'd check the supply lines for ripple if you've got another CRO. Probably either voltage set too

Hi All, I have a 2235 that displays what I can best describe as a shadow on the crt. It is not really a shadow cause it is light rather than dark, but that is the best that I can come up with. The

Hi Don, I suggest you call Lynn Hurd at 503-627-4643 at work at Tektronix and put that question to him. He is the "spectrum analyzer expert" in the customer service area at Tek and it is his job to

I wander if that indicates overload; as far as I remember DF1 does not have a backplane connector of its own, everything goes through that 50 pin D connector, power included. Regards Miroslav

Hello! I have been cleaning the 545B/1A1 and now it shines :-) Then I have connected it and I have got a curious trace; I have put a picture of it

The 7D01 alone will work, but not with the DF1. Doug

I did not consider screen burn, but I guess you are right. Regards Miroslav Pokorni