Author Topic: DAVE: SHOCKLEY diodes  (Read 299 times)

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Offline Addicted2AnalogTek

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« on: July 10, 2021, 01:56:09 pm »
Hi everyone,

It's been quite some time since I've been able to continue my hobby in electronics (life is evolving organized chaos), and even longer since I've posted. I'm to the point where I'm clearing out what I don't absolutely need and can't fit on/under one desk.

Currently, sitting in front of me on the desk, I have a small assortment of genuine Shockley diodes. (I've posted about these before, years ago.)

One of them appears to me to potentially be an experimental, hand made piece. Five others may also have been experimental.

Additionally, there's an assortment of:
(11)  4E20 M-28
(3)    4E20 A
(3)    4E20-8
(2)    4E20 M-8
(1)    4E30 A
(1)    4E40-28
(4)    4E50-8
(3)    M4L2054
(2)    M4L3054
(2)    ST36  (The only ones with date codes - 6527)
(1)    ER900
(1)    Lettering is worn off, but what's still visible is: "STDXXX, MAL629", where XXX denotes unreadable text or space.

So here goes:

1) I want to see these go to people who will truly appreciate the history that comes with these pieces.

2) I'd like someone who has quality photography equipment to document them, send the info to the semiconductor museum and other places of record. Curve tracer characteristics would be fantastic, too.

Dave, if you're interested, I'd like to offer you the six unmarked ones and any others that you're interested in. I know that you'd handle them well and I 100% trust your judgement on wherever you would re-home them to if you didn't choose to keep them. If you are interested, PM me also, as I've got a question for you regarding these diodes.

Best regards to all,


Offline tooki

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« Reply #1 on: July 10, 2021, 02:11:15 pm »
You should send them to Fran Blanche. She’d appreciate these far more than Dave, since he’s not really that into vintage gear. Also folks like CuriousMarc (computer history museum), etc.

Offline Addicted2AnalogTek

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« Reply #2 on: July 10, 2021, 02:41:46 pm »
I offered them to Dave already, so I'm going to give him time to respond.

Depending on the outcome of that, I'm open to suggestions regarding where these should go - as long as no arguments evolve.

Also, fair is fair, so if someone is going to directly financially benefit from these (selling them, building devices with them and selling the devices), I'll expect to be paid for them. I'd like to have them go to people that will educationally benefit from them and get enjoyment out of their use and history.

But as I said, I'm going to wait it out for a response from Dave, and then I'll go from there.

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