30 Aug
2008
30 Aug
'08
10:58 a.m.
William Donzelli wrote:
I have exactly one 12U7 in stock. I have a few 12K5s,
as
well.
I've now got a number of different dual triode tubes to try from a local electronics
shop that has a large collection of tubes from former TV and radio repairmen. $1 each and
they have a B&K 707 tube tester to test them on.
One thought about using space charge tubes for logic -
they
might end up being slow as molasses.
From a message above, it looks like even a 6.3V plate
voltage on a standard (not low voltage) dual triode tube will work and I'm after a
visibly slow (a few Hz at most) multivibrator anyway with a binary counter circuit
attached.
30 Aug
30 Aug
11:17 a.m.
I have exactly
one 12U7 in stock. I have a few 12K5s, as
well.
I've now got a number of different dual triode tubes to try from a local electronics
shop that has a large collection of tubes from former TV and radio repairmen. $1 each and
they have a B&K 707 tube tester to test them on. 
11:25 a.m.
William Donzelli wrote:
Well, in case you wanted proper space charge tubes for your digital
logic experiments.
The problem with them is HUGE filament current.
Pencil tubes look to be fun to play with, but you never hear
about them cause of the war. http://home.netcom.com/~wa2ise/
I have exactly one 12U7 in stock. I have a few 12K5s,
as
well.
I've now got a number of different dual triode tubes to try from a local electronics
shop that has a large collection of tubes from former TV and radio repairmen. $1 each and
they have a B&K 707 tube tester to test them on.
--
Will
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