Using subminiature tubes in a radio

[wa2ise]

Used a 5899 semi-remote cutoff pentode in place of a 12BA6 in an AA5 type radio. I passed the submini tube's wire leads thru the wafer tube socket pin holes and soldered the ends of those leads to the tube socket terminals. The submini pinout nearly matches that of the 12BA6, except for the plate and a heater are swapped. That's the crossover with insulation you can see. Normally a shield fits over it. It works well. Looks cool too