1 Jun
2012
1 Jun
'12
1:36 a.m.
On Thu, 31 May 2012, Tony Duell wrote:
The Anita Mk VIII is full of 22M and 18M resistors, mostly on the digit
modules. They are used in conjunction with the cold cathode relais tubes.
The problem with those old carbon film resistors is that they increase
their resistance when they age, so at the end you have to replace all
those in an Anita that have gone over 25M, otherwise you'll have a very
non-deterministically working machine. (Next problem with the Anita are
the selenium diodes in the logic, a nightmare...)
Christian
I've used
10M resistors, not often, mind you, but I have. I think
I think the larged 'normal looking' resistor with coloured bands that
I've seen/used was 22M, Maybe 56N