I spoke with EE's involved with tunnel diode in the early 60's.They told me of their struggles. TD's were going to be the great savior... except that is was hard to make a run of them that had consist

What is his eBay ID? In a message dated 2/16/2021 6:18:14 PM Eastern Standard Time, voorhis@... writes: On 16 Feb 2021, at 23:09, snapdiode via groups.io <snapdiode@...> wrote: L

My board set came today: What a wonderful job of packing! Very professional! Thank you so much for undertaking this project.Best Regards,Jeff Kruth

On the topic of plug in YIG based pan receivers for Tek scopes.... I dug in my pile of historical rubble, er, "artifacts" and found my Microwave Physics Corp (of Garland Texas) "Panoramic Receiver Plu

I have been a professional microwave engineer for over 40 years. I have "heard" this said. However, the quality stainless steel type SMA's (like OSM, Narda or Weinschel) I have used have been mated MA

While I am sure there are many tips that others have, I found a thin hot soldering iron pressed into the iron screw socket head will sometimes add enough heat(expansion) to get things going. I have al

Hi All! Just today I found 4 custom assemblies here, built in TM-500 frames. One is missing the covers. They have a front panel that may be adaptables for the project. I would like 15.00 each for the

I would also go for a set of boards.Thank you!Jeff Kruth In a message dated 1/3/2021 8:10:22 PM Eastern Standard Time, lmcdavid@... writes: Here is an update showing the list of those I have on

Not totally true. Stores cost and they do have hidden fees for listing unless you get free listing privileges. My 23rd year on eBay and boy, has it changed, from great to reasonably sucky. Jeff KruthI

Hello! What a great story! A wonderful memory of how companies like Tek used to behave toward enthusiasts ! Thank you for sharing it!RegardsJeff Kruth In a message dated 12/19/2020 3:54:01 AM Eastern

Like any other hobby or endeavor of man, scarcity leads to speculators wanting to cash in. In the 1980's when I was buying govt surplus buy the truckload, no one wanted 500 series scopes. They fell fr

IIRC, the 3A1 uses a pair of 8233 tubes (look like oversize 12AT7 or similar, but not compactron) which, for some reason, are prized by audio-phools. So they go away. RegardsJeff Kruth In a message da

I dont know if this helps, but I have a small stash of metal can J310 type.Jeff Kruth In a message dated 11/16/2020 9:35:56 AM Eastern Standard Time, charlesterrebonne@... writes: thanks to al

IIRC the 547/549 and some of the P/I's. like maybe the 1A4 used some transistors. Also the 561/564 series and their P/I's used some as well. These were the hybrid series scopes, I had them all, and th

Hello All! I know how it is: too good to throw away, dont need it anymore, taking up space, dont want the family to have to deal with it, hate to waste stuff that meant something to you at one time...

Well, if I were interested, I would find another reason to go that way, and pick it up. One guy can lift it, you just wouldnt want to run around the parking lot with it. Along with the cart, aint gonn

Did he say his dad bought it new? Thats what I would question. You are right, a staggering sum for a TV shop in those days. In a message dated 8/27/2020 1:46:50 PM Eastern Standard Time, colingherbert

I can see it: He was a tinkerer and always wanted a high end scope, got a chance to get one surplus through a friend at an electronics company, yep! I have a friend, John Jolly, who was a TV guy but d

Ugh, fat fingered Tantalum! I

In my experience, if a unit has a bad tant or two, it may pay to replace them all, esp if not the sealed hermetic type, since you are already in there. The orange (maybe blue, sometimes red) "Gumdrops