Re: tunnel diodes retrace lines in curve tracer


Hi Brad,
RCA made them. They came in a 1" wide stud mounted case. The stud's threads were 3/8" - 24.
The RCA 40079 had an Ip of 180 to 220 AMPS!
The RCA 40070 was rated at 90 to 110 AMPS Ip.
Dennis Tillman W7pF

-----Original Message-----
From: [] On Behalf Of Brad Thompson
Sent: Thursday, February 18, 2021 2:22 PM

I dimly recall a mention of 100-ampere tunnel diodes, likely lab curiosities that never saw production in any meaningful quantities. One possible application might have served as switches in a DC-to-DC convertor fed by power from low-voltage sources (thermopiles?).


Brad AA1IP

Dennis Tillman W7pF
TekScopes Moderator

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