You could use a 6E5 or 6U5 but probably can't afford a 6T5. Might find one for $100 but probably much more. They are in demand for certain Zenith radios.
Norm
:Radio Daze or Antique Radio Supply are the best for sure.
Mavis Skinner
If you are not a troll -6T5 tubes are extremely scarce being quite specific to one or two Zenith models, a "few" in a storage shed would be quite surprising- this offer should attract a few vultures.
Syl
-hehe, nice catch. I missed it...
Syl