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Non-working TM500 modules appear on eBay from time to time at fair price and include top,? bottom and side panels and the all-important latch-release pull-tab. Shielding is not important for this

In my experience, the 3D printed plastic frame needs a thin gauge aluminum backing to give it rigidity.? If you had any machine shop capability (such as a decent drill press), you could make your own

Wow.. I just checked my 40 + year stash of normally useless crystals, and found 52.500000 CR-55A/U. Probably a 3d OT, but the spec should tell. HC-18 with the hard pins, not flying leads. Yours for

Does anybody now if the aluminum plates are required? Would plastic plates (3D printed or otherwise fabricated) work just as well? My stable of TM500 modules is already pretty thin, and I don't have

Okay, I've examined R1375 (with the power off, and I'm not sure where to probe for anything other than that center tap on the pot, so I can't really answer whether it's seeing the full +50 V at one of

I ordered my rotary switch from Digikey, looks like there are 100 in stock with a little bit of a price break for multiple purchases. Might be worth looking around for cheaper prices, I didn't ask the

Six list members have said they want to participate in a group buy of these board sets. Those are: ML PA SM DC HB GL I've asked Jared for clarification on some points and for help ensuring the order

I have not examined the grid bias trim pot (R1375) yet, so I don't know what voltages it sees. Like I said, if it turns out that the trim pot has drifted out of spec that would explain a lot of what

What do you mean by chip? 74LS logic and SRAMS can be tested with the TL866 II device programmer.

Greetings, Allow me to seek some owner/user comments as well as alternate suggestions. I am considering acquiring an IC tester/identifier instrument. Currently, on-line I have found a very limited

Sorry! that should be 50 volts. Not 150 volts!

The diagrm I have for 475A has the Q1332 base grounded. I am not sure about the readings you have mentioned. I have not gone through the whole manual but just looking at the schematic only. Also, do

Yes, it works better in US units -- "1ns per foot". "3.3ns per meter" just doesn't quite have the same mnemonic quality. --Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford

Wow, that brought back a memory - I attended her talk in person when I was a cadet at the USAF Academy, and that 11.8" has always stuck with me and been quite useful. That would have been about 1977.

Me too. Glenn

To answer a few other questions: I used a blank module kit to build this project, I lucked into one when buying a 'mainframe with modules fitted' at Yahoo Auctions so put it to good use. But I don't

Hi, Wow, I didn't expect such a big response. :D haha As for production of PCB's, I did use PCBWay as they are a sponsor of my Youtube channel, however, they are a slightly more 'premium' Chinese

Thanks everyone for your comments. It certainly uses some early Ge pnp transistors in less critical areas. The lowest 2N number in it is a 2N270 which is an emitter follower for the shift voltage

money, simply money. using SEEED studio as an example, a 113 mm by 246 mm board, HASL (roughly a complete inside of plugin, is 65 dollars for 10, 48 dollars for 5.? ENIG goes to 94 dollars/10 and 75

The downloaded files go into your Windows Downloads folder; check near the top of the folder tree in Windows Explorer. If you are using an Apple computer, you are on your own...LarrySent via the