Hi Ozan, Yes, it's funny how once you notice something, you suddenly see it everywhere. In the case of the 741, that NPN-PNP mashup was done to work around the terrible performance of PNPs. By combini

What is the type of this capacitor, and what are its appropriate replacement types? Picture of C1534: https://groups.io/g/TekScopes/photo/258720/0?p=Created,,,20,2,0,0 Manual calls for: FXD,ELCTLT: 3U

https://sacramento.craigslist.org/zip/d/rio-linda-two-1950s-oscilloscopes-for/7261128129.html About 45 min from where I live, just north of Sacramento, California USA

I have recently acquired a well optioned 2465 DMS in good condition (except for some exterior damage and degradation that was easily repaired) but I am having trouble finding an operators manual that

No relation to seller https://sacramento.craigslist.org/ele/d/vacaville-tektronix-535a-oscilloscope/7262163827.html Not bad with scopemobile etc. About an hour east of San Francisco also 5113 https://

Hi Folks - I'm seeing an intermittent intensity modulation at line frequency on my 564, and have been unable to measure the source. I've tried both a 3B3 timebase, and a 3A72 in the horizontal slot wi

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

Found this on Craigslist https://corvallis.craigslist.org/ele/d/corvallis-large-lot-of-tektronix-test/7261764719.html

Previously you might have noticed I have an issue with the 577 curve tracer where the IV curve has an offset problem, click the link below to see a picture that demonstrates the problem https://groups

Hi all, I have been accumulating TM500 modules and mainframes for a little while, so I recently finished building an 067-1201-99 TM500 mainframe tester from the Tek construction notes floating around.

Pleased to report a package of Peter Keller books arrived safe and sound in the UK end of last week. I was rather surprised how fine these are - nice hardbound volumes with nice design work - a pleasu

Hi guys, im looking for a missing knob of the trace positioning (see pic below) https://i.gyazo.com/8e018f12acdef8d57bc2c949135d350f.jpg The original part number is 366-1027-00, unfortunately i cant f

Due to a freak accident, the shaft of the Variable Holdoff potentiometer broke and I need to replace it. The details are: R9521 311-2146-00 Res, Var, Nonwir: 50 ohm, 20% 0.5W CM41773 It is a Clairstat

Dennis – I hope you don’t consider this off topic. It is not on repairing a classic Tek scope – but an aspect on how they were made. After reading the posting from the Peter Keller on the Coketron, it

I believe the following report from the Hampden County MA 22NEWS explains why these 6 Peter Keller books are being held in the main USPS Seattle Network Distribution Center. Tracking #: 95490163359410

Hi All, I peruse the Auction site HiBid for items of interest to me (note: Hibid is a "consolidation" website that helps auction places all across the country have one centralized web location). I als

Someone here (I believe) was preparing a BOM for the Jared Cabot TM500 tester but with DigiKey stock numbers. Has that been completed? And, one capacitor P/N was incorrect; what was that? Note that in

Hi, On my 2465, the Ch1 BNC is slightly "loose", and the signal is intermittent depending on which way the probe cable/connector tugs on it. The connector seems to be integral to the A10 attenuator as

Is there any source for the slip-on "grabbers" for the P6105 probe. These are Tek P/N 013-0107-0. I seem to have lost one. This will teach me not to keep a trash bucket under the scope on the scope-mo

Hi Group, Some years ago I got 2 basket case scopes. The problems involved a leaky diode and bad trigger chip in one and for both I decided to remove the batteries, and not have them internal to the s