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It wasn't recognized until the vacuum tube era had ended that cathodes are actually semiconductors, whose electrical properties are exquisitely sensitive to morphology and trace impurities, as your

As a tidbit of trivia and only a little bit off topic. Eimac tried to build, I think it 8877's, at their plant in Salt Lake City with not much success. They determined that the "air in SLC was

I'd say the anode straightforward to +5V and pull down the cathode via a trimpot. I assume an isolated power supply for the TD circuit part its +5V connected to scope GND. Usually the switch of the TD

Hi Bernd, As I said, anything that fits on the usual ferrite core, and uses the usual cardboard former for the winding can be wound with my machine. So, it's all the same to me. I will make up the

Hi Charles: I read through a two decades old PHd thesis on CRT cathodes. ( as anyone can too! There are any number of people posting here who will first humiliate one.. but, explain things one might

I have bought from them before and have had no problems except when they were out of stock and cancelled my order of some stuff. I don't think you will have any problems with the quality of the parts.

I do hope you are able to add 561/4B, 549 and 556, at some point...B

Gold plated GR874 connectors are almost guaranteed to be 125 ohm, and applicable only to the 519.? I used to search hamfests and swap meets for them, and you can spot them a long way off.? The

The faster rates of the 7B87 are too fast for the 7603, by far: Fastest calibrated hor. sweep is 5ns/div. 7B87 goes down to 1 ns/div (with 10x multiplier). Raymond

Shipping rates from Canada really suck. So does the wait time from China...

Would be nice to get a few NOS J300s...but...I dont know about that vendor but at 0.62$ each....no picture...does not say these are NOS?....Ive gotten so many fake semiconductos in the last few years,

Ugh. https://www.ebay.ca/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313&_nkw=d-sub+coax&_sacat=0

No, and not sure why you would want to, the topology and function are virtually identical. The 370 would be a different story. I work on these models regularly, these are the differences that I know

While searching Ebay for a GR874 splitter tee, I came across this listing: https://www.ebay.com/itm/Lot-of-4-Tektronix-017-054-017-052-With-General-Radio-GR-874-Connectors/362763553704 I think these

good point, thanks for the reminder! The DIP canned crystal oscillators must have more current source capability than standard TTL. I ran the output through a 1K resistor and a 5K trimpot to the anode

Hi! im currently fighting with a Tek 2230 that really don't want to come back from the graveyard, i'm posting this hoping that my experience may one day help someone else. So... i've got it from an

Hello Jim, I have designed and mfg HV transformers since 1970s. We used double and tripe or even quad build wire, and specials winding configurations. The Impregnation is either a special vacuum

Hello there: Very fine to yave these mainframes. I have the similar 7904, with 7B92A HOR plugins, HOR LIN is fine, however at the fastest sweep rates first CM of sweep start has some slight

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

The Balance and Grid Current nulling adjustments are different. Grid current is nulled by a circuit which injects an equal amount of current of the opposite polarity into the input line. The Grid