Description: 4 units for your collection 4 ea. M-1887 Bell Labs developmental/experimental alloy transistors You would get some sample similar to the photos. Message me if you need more details. The units with the ears are Helium back filled. Some were silica? White power filled. These were experimental proof of concept units that were then put under test Yes.. that is 4 leads you see, but these are not tetrodes! I have some that the dead lead is clipped off or clipped short to hang a tag on! It was common practice to grab a base mount eleven if it had 4 wires.. and I had one old timer tell me his bench only had 4 wire base mounts! You will get the exact 4 units in the photo See all photos - they are a great description. These are rare, of course. Offers are considered for highest and best use. Talk to us. Untested andsold as is many semiconductors from this era ate no longer functional no returns no refunds see photos you will trecieve similar units- they are your description! Ask questions Offers are considered for highest and best use. shipping priority tracked...insured and sig. confirm
Price: 695 USD
Location: Glendale, Arizona
End Time: 2024-02-29T08:33:01.000Z
Shipping Cost: 19 USD
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All returns accepted: ReturnsNotAccepted
Theme: Inventors & Geniuses
