16 Aug
1999
16 Aug
'99
2:39 a.m.
Hi Allison and all,
At 08:18 AM 8/16/99 -0400, you wrote:
IT was back if my Valve RF days and someone said they werent real tubes.
later I would use three of them to make a superregen reciever with
audio amplification that ran on a 1.5v and 30V battery. They were
miniature in size ~.350 dia by 1.3 tall and low voltage filiment.
Fair Radio still has similar size ones on a calculator output board (12
displays, 9 segments+ each), US$3.00. I bought one, and haven't traced the
circuit except all the filaments are in series. The "grid" appears to be
the normal vacuum fluor. mesh, Some might be able to trace the circuit
quickly, since there are duplicate circuits, but I'm not one. It has NEC
ic's of the time:
uPD10 and uPD16 in metal cans, uPD13 in a 14 pin DIP, and 2 others. Round
epoxy transistors are the digit and segment drivers.
I'd love to find some of the super submini tubes
(display or not) again.
Allison
-Dave