Good day, While working on a troublesome plugin, I had cause to open up my TM504 to check the power transistors (as one does). I am surprised to find that Q22 and Q30 (an NPN from one middle slot, a P

I've just noticed something odd about the calibrator outputs on my 535A scope and 127 plugin power supply. They both have a 0.25R resistor in series with the calibrator socket's ground connection. The

Strange ad. He says 2x 465B, but the picture shows 2x 475 plus something I don't recognize. Located about 45 min from me.. No connection. Bob https://sacramento.craigslist.org/ele/d/auburn-oscilloscop

I made a casual comment in another thread that the early (pre SN B250000) 465 did not have a "mesh" in it's CRT. This was based on it missing in the CRT schematic diagram in my early 465 Service Manua

Hello, as I had initially planned my objective was to exchange all and every "suspicious" capacitor and these selenium rectifiers. Right now I have got a basically well operational instrument, but not

Hello all: Seeking a cross ref of all Tektronix lamps TEK part # like 150-0090-00 spec volts, current, envelope instrument used in, industry lamp type # Would be very handy! If it does not exist perha

I have just refurbished and calibrated my 7603. The frame itself showed 2.5ns rise time and bandwidth was 140MHz. With 7A26 system rise time is 3ns and bandwidth seems to extend to 130MHz. Small dip a

The Grayhill 71BDF30-20-2-AJN multi-way switch(Digikey GH7108-ND) is out of stock at Digikey ☹ Mouser has a few (16) and lead time is 16 weeks. Master Electronics, Electrosonic, and Verical also have

Well, I finally got me some 2N3442s from mouser. Good news: the HV sparking problem was definitely cause by the 75V regulator going short. Bad news: there appears to be no vertical deflection. But, th

I recently brought my 7D15 out of storage and found that when plugged into the 7704A it took down the display. A second insertion in to the 7704A brought some smoke, quickly identifying the bad capaci

Hi, Wondering if any folks here know exactly how to get the variable control shaft to come free. I have a fix for my broken plastic problem thanks to Jim Adney, but after studying the mechanical diagr

Thanks to all that offered advice on my freezing TEK 2430. I've replaced the RIFA safety caps and all of the less than 50v electrolytics in the low voltage supply. I'm at the 4 hour mark and everythin

Our on-line Stuff Season Event at Sphere Research Corp. is now fully stocked and open, you can see it all here: https://www.sphere.bc.ca/test/stuffday.html It will run through the summer, and will get

Hi, I'm looking for an AM5030 Current Probe Amplifier (Basically an AM503B with GPIB), with shipping to Japan. If anyone has one they want to get rid of at a reasonable price, let me know. :) Thanks!

Dear Tektronix Group. Attempting to Test a Tektronix S-4 Sampling Head but without Success !! Tektronix 7S11 + S-4 Head placed in Tektronix 7854 4-Slot Mainframe (Right Vertical) And Tektronix 7T11A p

Happy Easter everyone, my 492P was working when error 59 and then error 58 appeared for a moment on the screen, at the same time on all span / div the signal amplitude is low compared to the correct v

I've got a TEK 2430 that seems to work just fine for about 15 mins. Sometimes more. All tests PASS. I've input a function generator and all different inputs look fine on both channels. Then after 15 m

For 7L12ers: Can you run a quick test, please? I have been restoring a 7L12 for a while now. First was the Weinschel input attenuator, toasted by excessive input. A long rebuild using parts cannibaliz

Hi all, there's a few companies producing clones of modern chips for music synthesis, including CoolAudio (aka Uli Behringer) in China, ALFA RPAR in Latvia, and SSI. The first two have their own found

A little more than 3 weeks ago I had no idea my life was about to be turned on its head. Marian's hip replacement operation went extremely well as far as the medical staff was concerned. She was offer