Great, Jeff. It looks like we¡¯ve managed to narrow the window considerably. So it¡¯s looking like the Age of the TD started around 1961 and ended almost exactly 20 years later. Not a bad run for an oddball device.
Sent from my iThing, so please forgive typos and brevity.
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On Feb 21, 2021, at 10:27 PM, Jeff Dutky <jeff.dutky@...> wrote:
?Tom,
Concerning the last use of tunnel diodes:
The 465B, introduced in 1980, uses tunnel diodes, the 2215, introduced in 1982, does not. Is that merely a result of the lower bandwidth of the 2215 versus the 465B (60 MHz versus 100 MHz)? If so, then we can take a more comparable instrument to be the 2235, introduced in 1984, also without tunnel diodes. That puts a pretty narrow windows on the end of the tunnel diode era.
-- Jeff Dutky
