While waiting for my Schottky diodes to repair my S-1 (and possibly my S-2), I did some searching for currently available substitutes. The late, great Bob Pease once wrote: "One "diode" that does turn

Hello everybody, I am writing about the attempt to transform my TR503 into TR502 to use it with the SA 7L13. I started by replacing the 55 MHz crystal with a 52.5 MHz one (thanks James) and after some

Hello, sorting some of my plug-ins in very different condition I have come across the following "almost twins": 1. A well known CA plug-in, in working order, has always been a good work horse with my

Hi all, I recently got myself an SG503 Leveled Sine Wave generator for a good price and I am currently repairing it back to operational condition. I found a few components in the oscillator section we

?Does anyone know a fix for the question marks that keep being randomly inserted in my posts? <--- That one is intentional :) Dave Wise Safari under MacOS

Long shot here... does anyone have a case that fits a Tek 114 pulse generator? I got the chassis many years ago with a missing power transformer. Rigged up two transformers (the smaller one is for the

It didn't help. Sorry group, I guess from now on I'll have unintended question marks here and there. Bear with me. Dave Wise ________________________________ Sent: Monday, February 22, 2021 1:55 PM To

I just want to mention again that all the issues raised with regard to module extenders are important, and no matter which route you go, the result is always a bit sub-optimal, and awkward on the benc

Hi folks I´m looking tunnel diode in curve tracer, I don´t understand because the retrace, jumping lines are straight and no in cross pattern https://w140.com/tekwiki/wiki/Russian_tunnel_diodes#/media

I'd appreciate the enlightenment why somebody dished out >$500 for a PG506: https://www.ebay.co.uk/itm/Tektronix-PG-506-Calibration-Generator-/224356816953 A few months ago I was the second highest bi

The recent discussion about tunnel diodes got me wondering about when they were being designed into Tek instruments. Questions: - introduction date and model of the first Tek instrument with tunnel di

So, with all the Mainframe Tester PCB's being sent out recently (thanks Larry!), now is the time for a construction thread for all the questions and info and notes etc on putting this together. As a r

I managed to understand the working and schematics of the 7854's digital section since I last reported this issue, and fixed the problem. For posterity and for the benefit of anyone who is trying to t

To avoid any possible mistake I bought the 2465b with frequency and TV trigger option(picked up locally) AND the 485(to be shipped next week)! There is also a 468 in claimed good shape for like 110 bu

I recently acquired a P6201 active 1X FET probe which appears to have never been used. The inspection tag was still attached, the accessory pack was still sealed, and there was not a single mark on th

I mailed all of the international orders for Peter Keller's book today with the exception of the five going in one package to the United Kingdom via UPS. Those will be mailed as soon as I get the pape

Hello, I own 2 "type 454" scopes togetre with a "type 491" spectrum analyser. The high voltage transformer (T1430) of one of the scopes is dead. Who could tell me where to find one, and at what cost?

Tom Lee wrote on 2/20/2021 9:25 PM:<snip> ....You could make them in dirtyrooms (take a look at early die photos of ICs -- you can see all sorts of crud; apparently, the industry then relied on cigare

My 2467B >B052xxx suffered two nasties! (The processor board caps exploded and subsequently ate up some of the copper traces near them underneath the solder mask layer. (tough to see) Also my sram bac

Down the rabbit hole again... of unobtainium tunnel diodes, that is. I couldn't get my "new" 3T77A to trigger at all. I'm actually not sure if the 3S2/3T77A/561A combo allows internal triggering or no