Just a thought, maybe the diodes originally used had a much different
reverse leakage which, in half wave rectified setup, caused the polarity in
the tube to flip slightly - at low leakage current levels - and thus
extinguish it more cleanly between ripples. Modern(!) silicon (verses
germanium)
What happens if you remove the capacitor alltogether?
Ronald Dekker who wrote about the manufacturing of these showed that they
can be driven with a CMOS 4017 in an article in Elektro Magazine, it is
listed in the other thread by you:
https://groups.google.com/g/neonixie-l/c/gNwRMF9iq1s/m/eUH7Q
>Can a Dekatron be driven like a Nixie from a 74141 instead of using the
steering electrodes?
I've not actually done the experiment in the way that you say, but the
answer should be 'yes'. You'll need a selector dekatron though where all
the main cathodes are brought out to their own individual
A 74141 might work properly, because it's a decoder that only allows 1
output to be driven low at any given time. To properly drive a dekatron,
such as an A-101, you should drive it with an 'overlapping' drive pattern,
which has 6 phases:
1- Drive cathode 'N'
2-Drive cathode 'N' and the first st
Actually, musing on it further, you might have a bit of a problem with the
74141 and dekatrons. I suspect the chip output transistors won't have a
high enough Vceo to cope if you try to use the typical dekatron anode
voltages. Likely you're either going to need to play around to run the tube
at
If you can get your hands on a GSA10G you could even let it drive a Nixie
at the same time, or you can use one of the A-201 Polyatrons with a Nixie.
You can use a set/reset circuit for each cathode on the GSA10G (or any
selector dekatron) as well as on the auxilliary anodes of the A-201, it
wil
Thanks Jon; I am starting a new thread for this Dekatron project.
I will post tomorrow after some tests.
Peter
On Sat, Feb 13, 2021 at 3:31 PM Jon wrote:
> Actually, musing on it further, you might have a bit of a problem with the
> 74141 and dekatrons. I suspect the chip output transistors won'
Thanks Martin; I am starting a new thread for this Dekatron project.
I will post tomorrow after some tests.
Peter
On Sat, Feb 13, 2021 at 5:10 PM Dekatron42
wrote:
> If you can get your hands on a GSA10G you could even let it drive a Nixie
> at the same time, or you can use one of the A-201 Po
I have a number of Symbol Nixies that may be of interest.
These are definitely New Old Stock and are in boxes. The Dario tubes are in
plain white packaging whilst the Mullard tubes are in original Mullard
boxes which show no sign of wear and have obviously been stored carefully.
Mullard ZM1021's
