OK, so you want to replace the cable only and mount the connectors yourself ? As far as I know that can't be done. You won't find the cable or connectors for sale by Tek or anyone else. Check again.

I finally fixed it completely. Even the trace bouncing off the left wall of the CRT. I had -20VDC at the TP, but no +20VDC. After changing a few tantalums (C940, C950-because it was closer the what

Hi Ed, If you have a cheap complete SC502 that need repairs but with the unobtainum parts included, I would be interested. Contact me via email. Best regards,

One of the nice features on the 485 is that you can switch the calibrator from 1kHz for the standard compensation adjustments to 1MHz for the rise time checks when otherwise the trace would be very

Yes. The compensation box and shell come off...but I said "I'm not even sure the probe comes apart... so that you could replace the cable"... replace the actual coax cable... not replace the "cable

there little to nothing on the Tekwiki page (other than the title) that applies to just the P6139... everything is about/for the P6139A. (The link to the EEVblog post about the tin whiskers problem is

Hey David that is exactly what the signal was it was a fast rise at 1Khz. Eric

Transistors Q935, Q940, Q960 replaced. No change... Since I’m at a complete loss, I decided to look at the other end, from the power switch, which is located on the opposite board (A2), and look

Thank You Brad

Typically you need a faster repetition rate on your test signal for it to be bright at 500pS/div. I'm guessing that you were using a fast rise pulse from a CG551AP or CG5001 or PG506 for

Stephen wrote on 8/17/2020 12:37 PM: If anyone truly needs genuine  NOS 2N3565s, I have FS  a factory-sealed bag of 40 pieces. These were manufactured by Sprague and predate RoHS and the

I will put in the 3904 then. It’s in the power section, not the amplifiers. And thank you for the offer Ed. I may need some parts. Will let you know as I move along with repair.

Update: - Locating a new switch was going to be a fools errand - Repairing the switch also seemed impractical - I got lucky because the missing signals were simply grounding control

I was working on some 7000 series plugins and I noticed some strange behavior out of my 7904A. during the high frequency calibration I found that the scope was a little dim readable for the

The 2N3904 should do in a pinch, the 2N3565 is only rated at 25V Vce. Only concern might be frequency response if in the vertical or horizontal amplifier circuits. I am parting out a number of SC503,

I think many people consider the covers as shipping material and don't take care of them later unless the scope is used as a portable. A scope sitting on a bench would be sold off later, the cover

There's some on ebay.

" In TDS3000 Series NVRAM contain ONLY User Settings, RealTime Clock and Operation Hours." ...and the baseline offset calibration. Dave

I wonder if Tek had made the covers for the 400-series scopes more like the one for the 465M, where there's a somewhat useful storage compartment built-in, whether the covers would have stayed with

The cover for the 485 is similar to those that fit the 465 and 485 (I know because I owned a 485 with a cover). That is, plastic, no catches other than a molded clip on either side that snaps over the