Zenith 7h822-z tubes not lit

[old_coot88]

A vital factoid to hardwire unto one's knowledge base is this -

Series = constant current

Parallel = constant voltage

To elaborate, in a series string, constant-value current runs thru every element of the string. Voltage across individual elements may vary depending on each element's resistance.

In a parallel setup, constant voltage is across every element, though current thru individual elements may vary according to each element's resistance.