The Rise and Fall of Dekatron Tubes Before Transistors Took Over
2.8K views · Sep 29, 2026 · People & Blogs
Comments · 10
@KennethScharf · 1 hour ago (edited)
Heathkit had a solid state dip meter that used a Tunnel Diode oscillator (the tunnel dipper). While tunnel diodes are rarely used today except for renewal repairs, you can simulate one with two junction FETs, one P channel and one N channel connected back to back.<br>The idea of an active device with negative resistance isn't new, Tetrode tubes can exhibit the same effect due to "secondary emission", and the pentode tube was introduced to "cure" this. There were some superhet receivers that used a tetrode as a negative resistance oscillator.
@vincentxgolden6624 · 22 hours ago
but TEKTRONIX used a bunch in the triggered sweep generator FAST fast there ruled
1
@gary6449 · 16 hours ago
AI done (mostly) very well !
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