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Hello, I tried by swapping one Q150 from working unit. That brought input signal to screen. I acquired two Q150 as both channels were similar and showed only 340k input resistance. Those are now in

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

In my experience, there is epoxy, and there is EPOXY! The stuff used on IC's, is EPOXY! The stuff used for potting generally has additives that make it epoxy. One thing they don't want to happen in

I de-pot epoxy potted assemblies frequently, and I use heat. First, I put the device in my environmental chamber set for 150C. When it is good and hot, I bring it to my bench, and use a combination of

Brooke Clark on his PRC68.com website reminisced about his days working for Aertech testing tunnel diodes. This excerpt is gratuitously stolen from his website: "Early tunnel diodes were made by hand

Hi all, I still wasn’t able to solve the “ripple” issue of my 465B. Apparently, as someone mentioned at some point, there is effectively 2 triggered traces. I could clearly see them. I have no

Nenad Filipovic If you are interested I have some working units available for sale. Contact me off list for details. Craig

I own a pg506 taken as broken (really broken, no powers up) for about 80 euros 5 years ago. Repaired, ii works since then. It's the only TM500 plugin I have, and I use it to calibrate 7000 mainframes

Hello all: PG506 are tricky to buy on epay: hard to fix as cleaning the switches or replacing certain ICs is not easy. Virtually no sellers on epay can properly test all the functions. So expect

C-B junctions can often be used as low-leakage diodes... I'm surprised that E-B are also considered low-leakage, given the low breakdown. Must do a comparison some day :-)

Dennis, A friend of mine is always disassembling things and reverse engineering them so I sent your message to him. He replied and that me that one of the guys that he used with work with at Litton

- wrote: I was at an auction years ago, and won some equipment. The guy I beat was mad. The next item up for bid was used IBM banking equipment. I bid $1 for a Gaylord full of assorted tiny monitors

Hi, Epoxies are thermoharders, which means that, once set (from mixing 2 base components) , you cannot melt them any more (unlike thermoplast e.g. poly ethylene, PVC, Polypropylene), see also

Great, Jeff. It looks like we’ve managed to narrow the window considerably. So it’s looking like the Age of the TD started around 1961 and ended almost exactly 20 years later. Not a bad run for an

Tom, Concerning the last use of tunnel diodes: The 465B, introduced in 1980, uses tunnel diodes, the 2215, introduced in 1982, does not. Is that merely a result of the lower bandwidth of the 2215

I wouldn't, those parts aren't even remotely alike. The 'DJ h

I meant an alternative to a PG506, not an alternative to eBay...

I was reporting the diode designator was incorrect in the "customer reference" field of the DigiKey BOM (which gets printed on the component bags), not in the manual. Minor typos/copy-pasta in manual:

The same alternatives that existed before E-bay. Garage sales, thrift stores, networking with similarly minded people, government surplus sales, surplus stores, etc. Due to the higher prices that