My clock assembly seemed to go smoothly and when initially turned on all systems looked good ... other than the 2nd digit of the 'seconds' display and the AM/PM marker - the two far left & right digits - are dim compared to all the others. As time passed ( ~10 minutes), some of the digits started to flicker - randomly - first it was the 1st digit of the 'minutes' display and then, after turning the clock off and on, the flickering move to the 'hour' digit. Then, after turning it off/on again the problem moved to the 'seconds' digits. Pretty weird, eh? If I turn it off for awhile and come back and turn it on all the digits are stable for awhile before flickering begins. If I let it continue to flicker the flickering gets progressively worse and the digit will eventually completely shut off/disappear. Turn it off for awhile and come back and turn it on and all is OK, for awhile.
Even with the flickering continuing, the clock maintains time and all menu functions are selectable. No segments within the display are missing, before the flickering begins.
I have redone all the solder joints on the tube and headers with no change in performance/results.
Any thoughts?