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I have heard anecdotal evidence that it was something that was occasionally found in early mainframes. When so many mainframes were produced, I'm sure a few slipped through on a tired Friday afternoon

That is the part. Thanks Glenn -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@...

Interesting commentary on a test test fixture for TM500 mainframes. it seems there is interest in stuff like this. I'm working on an interface board to enable powering and getting the signal out of a

Jared, Is there a way to easily bring the EBC of each pass transistor to the front panel? These transistors are items that often fail and need to be tested, especially on these old frames. Not trying

Does it look like the pic on the Newark Canada website? https://canada.newark.com/vishay/wsl12064l000fea18/metal-strip-resistor-0-004ohm/dp/18X4713 Specs are listed and data sheet can be downloaded.

Does it look like the device on the Newark Canada website? Don Bitters

If you remember the initial problem, and I think I do, one problem is that the transistors had either broken or missing insulators.? Considering what people can do to "fix" things, some sort of

I think I did hear that this happened to someone.? However, a phasing test is simple to do amongst other tests. Harvey

For the scopes... probably not... unless you had a frame... and needed a relatively rough source source of +_ 15V, or +5 volts, for an active probe... so probably not. For the why of the

Thanks for the help. I had not seen that coding before. A very good day. I learned something. Glenn

Yes... but, do they have to be "tested" by incorporating a "fuse tester" in the tester. Seems inelegant to me.

Add me to the list. I'd like one as a project in the bin.

But why? (Surely, frames didn't leave the factory, with miswired phasing [it's been mentioned plug-in were non-disposable back in the day!] ) And as to all the gremlins, re-arranging the wiring,

Yes, ?I once bought some crystals for an HP3456A from krystaly – I found them helpful and easy to deal with. Regards Kerry From: <[email protected]> on behalf of Tam Hanna <tamhan@...>

It's using the RKM code convention (and IEC thing, IIRC). Your guesses were pretty good. 4L0 means 4 milliohms. --Cheers Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford

It could be a 4mR resistor. ROHM makes SMD shunt resistors in that range. "4L0" would indicate a 4mR resistor, 5% tolerance in the PMR Series. See the datasheet here:

Please add me to the list of participants.

I have a battery BMS that I am reverse engineering. I have a resistor with a code that I have never seen and cannot find any information on. The resistor is a SMT device marked 4L0. The L appears to

My perspective being an electronics, amateur radio and RF engineering born again newbie with more from a chemist, with a chemometrics, programming, lab qualification/validations and leadership

I should mention one other thing.? To make the inboard power supplies more possible, and to remove heat from the module, TEK put in a general purpose PNP power transistor and a general purpose NPN