Hey Guys, I'm in the process of (mostly done I think) repairing a 7904 power supply that goes into pulse mode. I replaced a number of the bad tantalums on the cap rectifier board which brought some su

Greetings, I live in Colorado Springs, Colorado and received my copy of Peter Keller’s book today. I want to extend my complements to Peter for his efforts to create such a wonderful and informative b

Hi folks, I scored 485 with few missing knobs and very blurry trace. It was for about $30 so I didn't expect much from it. I have 2445B as a main scope I rely on for my everyday work as a vintage audi

Hi all. I'm looking to build an 015-0670-00 Feed-Through Adapter for testing the AM503B Current Probe Amplifier TM500 plugin modules. I'm hoping someone has one they can take a peek inside and take so

Hi all, and Happy New Year 2021, Is a 564B a good grab, is it desirable at all? It’s not considered a 500 series, right? 56x family I suppose... Thanks 😊

Printed circuit boards are generally made with one of two materials (there are others), either a paper epoxy (FR-3) or a fiberglass epoxy (FR-4). There are others, but these are most common. Paper epo

I bought this off of Offerup for $20. I wouldn't have even bothered, but the woman had a lot of good dealings, and I don't feel like she had any reason to lie. The scope among other things were her la

The book, "The Cathode-Ray Tube," Dennis shipped via Media Mail on 1/2/2021 arrived here in Southern California today, 1/5/2021. Three days in transit is not bad... And, it arrived safely, in good con

Does anyone have a DC-100A tape with Tektronix EZ-TEST software on it for the Tektronix 4041 GPIB Controller, that they are interested in selling? Mine has become weak with time and is not reliable an

I was mistaken to say Media Rate mail does not have tracking numbers. I just looked at the 84 inch (2.13m) long receipt I received and discovered that each of the 72 packages I mailed does have a trac

My new (to me) s/n B041515 7904 arrived DOA. (ebay, "not working, for parts".) With the help of my mostly trusty DSO138 I found the shorted 47/25V dipped tantalum on the -15 supply. Replaced it with a

I need to dissolve the black HV potting compound of a 12VDC powered Helium-Neon laser inverter power supply I have that stopped working. I would appreciate any suggestions on what works to do this. I’

Greetings to all, I brought home a 7613 mainframe to insert the 7L13 (SA) plug-in, but it has a problem in readout. It currently has a 7A16A vertical plug-in and a 7B70 plug-in timebase installed. Wit

Hi, I recently obtained a 2710 SA in non-working state and I am trying to repair it. The problem is (well, there may be more than one problem, but this is the one I can observe at this stage) the disp

Dear Sirs, I got hold of a 7L13 spectrum analyzer in a 7603 mainframe and I have two questions to ask you, first from the manual the tuning knob can be pushed or pulled to change the tuning speed, but

Peter Keller just provided me with a revision to the 4th paragraph of my original explanation for why the brightness of a well-used CRT first brightens then dims before finally brightening again as th

I have 10 or more Tek analyzer probes, wires, and clips that I have no use for. These are 92a96 probes with breakout cables and clips. Time to clean up my shop. Free for the postage. Send a private me

Bonjour a tous, Working on my 7L5, has just one bad shaft encoder knob, the FREQ span/div Usual flaky positions 1/2/5 kHz are acting like 100/200/500 kHz. Just using contact cleaner does not fix the i

Can anyone shed light on what is involved in repairing a unit showing that error? Thanks, Reg

Bonjour a tous, Voeux Nouvelle Année! The 7603 is used with 7L5 or 7L12 SA plugins. All OK except both SA have a flaky RO, with several areas showing scrambled alphanumerics. If I push on the FP of th