02-23-2019, 05:48 AM
When tubes have grid cap, those can become flaky in a battery set, the solder joints in particular, sometimes the cement holding them on also gives out. The grid cap leads also often had failing solder joints, as well as the wires breaking internally, it's worth checking first. The 1A6 and the two #32s all have grid caps, the #30s do not, nor does the #19.
Regards
Arran
Regards
Arran