(25-03-2019, 03:21 PM)pwdrive Wrote: Maybe the pin 4 thing was good practice, remember that the UL41 valve was a relatively new kid on the block at that time and that it had a fairly high value of mutual conductance, the valve manufacturer recommended that a grid stopper when fitted should be connected as close to the valve as possible which to me implies that it should also be located as close to the valve as possible (which it was).
It probably seemed the obvious thing to do at the time based on earlier practice regarding the use of the pin 6 of an octal valveholder. The difference, of course, was that in such cases, pin 6 of the valve was missing, which was not the case for pin 4 of the UL41!
UPDATE
I hadn't seen Trevor's 'solution' until after I'd posted that - it was completely coincidental!
