Eric
I've never used a GDT125T but I have used GTE175M as an interstage
coupler using the commonly available circuit. Not suprisingly it
worked! I've only divided by 50 from 50Hz to get 1pps. Using a divide
by 10 dekatron driven with sine wave , a GTE175M coupler and a 10
cathode dekatron with cathodes 0 and 5 commoned together to get divide
by 5 - a trick that works in 50 Hz land but a 12 cathode dekatron would
be needed in 60 Hz land. I have also built vacuum valve couplers -the
advantage is a simpler power supply the disadvantage is the heater supply.
400kHz is a real challenge for gas filled counting. Mostly a count in
the 10's kHz is the highest you'll get. The 6879 has a maximum
frequency of 5 kHz for example. High vacuum counters (eg E1T) get to 30
kHz (selected tubes get to 100 kHz). But that said, there were some
remarkably high speed gas filled counters made just as the semiconductor
was taking over. But are they available?
Grahame
On 23/03/2011 22:22, Tidak Ada wrote:
Grahame wich tube is more usefull to focus on to drive dekatrons: the
GTE175M or the GDT125T ?
I liked to make a clockrate divider beginning with two Elesta EZ10B,
followed by three Sylvania 6879's, preferrably driven bij cold cathode
tubes, and avoiding semiconductors. the highest frequency to manage is
400kc's
eric
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