Hi Steve! Way back in the early days of semiconductors, repeatability was a crap shoot. Thats why there were SO MANY early part numbers, a run would be made and they would see what they got, if not up

I bought this scope earlier this summer as new old stock, never powered on. Due to covid illness I never opened it until a week ago. The scope powered on ,but the trace only covered about 2/3s of the

One of my 561's has a severely double-peaking CRT and it's not that bright. Voltages are in spec. It's probably not worth locating and buying a new CRT (especially if the USPS is going to handle the p

In 2017, my 547 with Bill Schell HV transformer (installed around 2000) was working. It has sat unused in a dry basement since then. Today, in March 2021, that transformer exhibits the same thermal ru

Thanks to tireless photography from my son, I was able to put a lot of cheap but useful items up on the site for anybody doing Tek or HP repairs. Have a look here: https://www.sphere.bc.ca/test/stuffd

I bought a very inexpensive 7623A on the auction site and it just arrived. The aluminum cover on the back was dented in, and there was some damage to the low voltage regulator board (the fuse was shat

The following photos have been updated in the Sampling with 3S2 album of the TekScopes@groups.io group. DSCF0213.JPG By: Charles <charlesmorris800@...>

?To set the record straight, I post this with a new title. To you who reads only this post: After sitting idle for four years, my 547 with Bill Schell rewound HV transformer exhibited the classic HV t

I'm curious why transformers (in particular, this transformer) benefit from a coating - beeswax or otherwise. Is it to damp sympathetic vibration at the operating frequency/frequencies? Thanks, Barry

The 6DJ8 is a 6-volt version of the very expensive 8416. I assume a mod as simple as adding the appropriate resistor to the heaters. Has anyone done this before? -- Respectfully, Cliff White, W5CNW w5

Hi all, I recently acquired a *very* interesting Type 1S1. It is serial number B 11, and seems like it is very likely to be a prototype. It's in very nice shape physically, but has serious electrical

I have an 492BP, and a GPIB to USB National Instruments. Can I use the HP 7470A plotter program to save screens? I tried and I get error borad GPIB0 not found.

Hi guys, my first post here. I have been given a Tektronix 2230 scope. The previuos owner could remember het go it from somebody else, and there was something about a fuzzy readout. I always find it a

Hi all sampling gurus, I am continuing performance check of my 7S14 (B020274). Any idea how many pieces were manufactured? All the Hg cells were empty (and were leaked also). I replicated with the con

I have used Tektronix scopes since the 60s. They have always been the gold standard, at least as far as I am concerned. Now my old Tek scopes, I have 4, are getting old and keep requiring service. The

Kurt Rosenfeld has posted the entire line printer listing (454 pages) of the 1982 source code version 1.02 for the 7854. It's an early release but it reveals some interesting things.

Hello group. I have a 2205-40 that I use to repair tube amplifiers and other simple audio stuff. Everything works perfectly on the scope except for the SGL SWP trigger. I haven't yet opened up the sco

I feel like this has been discussed before, but I cannot find the thread now. Does anyone know of a solution for the 7104 readout not displaying except in "pulsed" mode when slaved to the gate (also w

I have a dead 2782 spectrum analyzer. I had a wierd screen and was looking around the video stuff. When I tilted it on it's side and it shut off and won't power up anymore.

Hello all, I was thinking about this and this why these Simpsons are important to me. When I joined the AF I became a Ground Radio Serviceman. One the instruments that I learned on was a Simpson 260.