GE NOS 80 rectifier tube. Excellent USA made quality which has a different base (UX-4) base but is electrically equivalent to 5Y3GT.
Excellent quality, and a very close reproduction of the Mullard/Philips type construction. These new production chinese 5AR4 seem to have less problems than the Russian or Czech made GZ34 tubes, and are now available at an excellent price!!! Just $36.99 per tube