Chuck, How do you connect your probe leads to the transformer output. Isn't the output side now independent of a ground reference? At my workbench, I use a 7A22 with two probes in differential setup.

Most failures on these mainframes are blown pass transistors, rather than lytic caps. I have 4 TM500 frames of various sizes. I can’t remember how many times I’ve replaced those pass

To the moderator I have been removed from this group due to a spurious posting in my name, I would like to re-join. RegardsKen Wright M0KHW kenwright309@...

Bear in mind that the blue does nothing to improve the contrast of the beam on P31 phosphors. It was chosen entirely for esthetic reasons. It matched the tektronix blue color used as a corporate

You should be able to make it into a DC-controlled, one-shot deal, but you may have to adjust the magnetic structure and coil bias such that it won't work in its normal resonant mode. Does it need to

EUREKA !!! I found a source of film/plastic that almost completely imitates the original color film, and its CHEEEP !! 1 sheet thick seems to mimic the color of the factory quite closely, and if

I usually just leave the 1M scope load to set the output impedance. But, since it is easy, try a few different values, and see what looks the best. 50 ohms would not be a good idea, as it would

If you are reading 62.5 Hz, then your engine is running slightly fast. Generators typically run at 3600 or 1800 (depends on whether they use a 2 pole or 4 pole rotor). Check your frequency at full

Some results: 1. My true RMS meter arrived, so I ran a few basic tests with the meter and the 465M. After starting the generator and letting it warm up, I connected a 500W shop lamp for a resistivity

I have a pile of misc scope filters - what's the exact PN you're looking for?

I have one of these fascinating old beasts, and 'enjoyed' pulling it back into resonance and cleaning up the output step when it needed a new relay. Pulses at a rep rate of a couple hundred hz are

Here is a crude summary of the discussion so far: OP (Robert) Is there a safe way to use my 465M to look at my generator output? Chuck Use a filament transformer Mike Check your grounds, and use the

As I understand the OP's original problem, he had to join a very fine copper wire to a component or assembly. As a graduate student (50+ years ago), I used CD welders extensively. The best candidates

1. 2020-Oct-24 :replaced a leaking electrolytic capacitor C124 on the A2 collector supply circuit board. https://groups.io/g/TekScopes/photo/255563/6?p=Created,,,100,2,0,0 2. Oct-26 :The Collector

I bought some gel online. It arrived wrapped in brown paper, and so wrinkled that I couldn't use it. I could only find clear plastic thin enough to use. The thinnest blue was over twice the specified

Hello George, Good to see you again. The Display Storage Boards I have seen going wrong (I have 3 of them), started to give asterics and F's at several places withing the field of view. If things get

Bob Search the exact part number on epay, ask Walter at Spehere Research in CA and Qservice in Greece. As a kluge I have used a theatrical lighting gel, available in 2' square sheets in a huge

Hi Clark, I concur, and as I have told you on many occasions, via email and in person, you are very lucky to know me :) Dennis

Hi Jon, Actually Eric didn't mention the SG503 at all. The cable the SG503 uses is a 012-0482-00 which I evaluated a few years ago. The results of that evaluation are in our archives

Hello again, SG503 cables are 0.5 m ~ 19.5" but Dennis has 42" so definitely not the SG503 cable They are very useful in calibration of pulse and HF response. Richard Cabot was selling a bunch on