Ok, several things after searching the  manuals. 1) the liquid is fluorocarbon 114.  SF6 is used in the AWACS transmitter unless they rebuilt it. 2) the P6015 has the liquid, the P6015A has a

Sounds like a good way to enjoy your 547 while waiting for a transformer!

wow, Monty, I am envy of your skills. Thank you for your generousity!  Cheers, Magnus

Thanks Monty! Very generous to put it up for us to use. I need to check all my mainframes to see if I need any - I'm sure I'm missing some. If I print them I'll let you know how it turns out. Dan

Can you explain what you mean when you say 'after a few minutes it turns off'? Do you mean that initially there is a trace on the CRT but after a few minutes it disappears? The 475 should show a

Hi Ernesto, Interesting story and solutions. Though I hope my 547 keeps going on without those HV problems! The bright blur when turning on the HV supply is not amazing. See message

Thank Chuck Harris I checked the tracks where the negatives seem to be going well, the tensions would all be there and the only problem is the one exposed in the previous message Roberto

Hi, I am a retired electrical engineer having designed electronic equipment for measurements in oil wells for over 30 years. About 40 years ago I picked up a 547 scope with an 1A1 plug in left as

Hello Neill, I'm new to this group in writing. Reading allready for a long time. I'm in the Netherlands. As I have been reading here on the Tek forum (Chuck Harris and perhaps others too), the

Or maybe SF6 (nasty) gas which is used in HV בתאריך יום ב׳, 17 בפבר׳ 2020, 10:22, מאת Yeun-Jung Wu ‏< B0190@...>:

Hi folks, While putting a TDS7xx back together, I required several new feet, so I modeled some. Files ready to print are

The vertical module I offered earlier, for the 475, has been claimed. Thanks much. -- --- Bruce Lane, ARS KC7GR http://www.bluefeathertech.com kyrrin (at) bluefeathertech dot com "Quando Omni

Thanks, Renee, but it ended up going to another fellow who has a broken 'scope he's trying to fix. Best of the week to you. -- --- Bruce Lane, ARS KC7GR http://www.bluefeathertech.com kyrrin (at)

Thanks! I checked again and it turns out I missed a second screw on the top left that attaches to the preregulator board. So there are 7 screws in total.

Victor, Before accusing the HV transformer ... some remarks. How "very low" was HV at the test point? Is the oscillator amplitude at Q1430 also (in ratio) very low? What voltage did you have at

If I understand correctly, the 454 HV is similar to the 453. I successfully rewound a 453 transformer using a low-tech process which I documented in topic and photo album titled "453 HV Transformer

I had to make the same choice when I moved cross-country in 2017. I chose to keep the 7904A because it has the kickstand and the 7904 does not. Having worked on both, I decided that the kickstand

Title says it all. I have multiple (MULTIPLE!) Tek mainframes and I'm hoping to cull the herd this year. I want to keep one 500MHz scope and it's either the 7904 or 7904A. What are the advantages

You're welcome.  I don't know if you have the particular HV transformer, but as Chuck (next) says, you're definitely looking at a low high voltage, so the question, of course, is why.... For the

Because you don't get a lot of room to route the heavy traces needed in a power supply, with a two layer circuit board, designers very often used cheats, like using the fact that all of the negative