[Fred R]

Ron, you really should restore your 37-643 and 38-643 sets. I know the reputation class B audio has but the 1J6G's pack a wollop, putting out almost 2 watts, ( I recall Philco slightly biased them with -3 volts to prolong B battery life). I think they compete very well with a set with a single 42 or 6F6 tube. The only thing these sets lack is brightness in their dials due to the 2 volt pilot lamps. The 2 volt bulbs are low current and just don't put out much light. Other than that, the battery sets perform every bit as well as their AC counterparts.
I still use an old battery eliminator marketed 20 years ago by Play Things Of The Past.
From my job. I got a power supply that handles upwards to 42 volts at 5 amps. It's perfect for 6 volt or 32 volt farm sets. These can be found at Hamfests or online auctions reasonably.