1 piece left in stock supplied in white box. General Electric made GZ34 are rock solid USA made construction and sound excellent. These GE versions of the 5AR4=GZ34=CV1377 have copper lined anodes and are extremely durable.
Mullard GZ32 NOS (branded Amperex)- Mint in original box wonderful sub for the 5V4 tube. Made in 1958! Just $199.99. This is a suitable replacement for any GZ32=5V4G=CV593 tube type. Various brands available.