Luckily, this radio uses loktals, and the 1L6 equivalent (1LA6) is cheap.

Frank Dresser wrote:


intermattant connections at the filiment pins. Most of the replacement
tubes are a few bucks each, but if it uses a 1L6, you'll be spending maybe
$30. Or a 1R5 may sub. I have a couple of battery sets. I've put zener
diodes across the filament supplies.

Frank Dresser