1950s or '60s vintage Zenith TVs, Need some info

[jr_tech]

“ Your 6AQ5 is a 450ma tube, so you're really pushing that one as well. “

For grins, I connected a 6AQ5 to a constant current power supply set to 600ma and measured the voltage drop across the heater. The heater voltage stabilized at about 10.5 volts! This is indeed really pushing it for a 6.3 volt tube... I suggest that proper 5AQ5 be ordered as well.

jr