[ARC5] No Doubt Dumb Tube Question

[Robert Eleazer]

In my Sylvania book I find the following indirectly heated cathode rectifiers:

3A2
3A3
3B2
5AR4
5V4GA
The Famous 35W4 
35Z5GT
36AM3A/B
50DC4

And I think I have a 117W4 in my collection.

The 5V4GA has max inverse plate voltage of 1400V and max per plate current of 525 ma, which compares very favorably to the performance of tubes such as the 5Y3GT.

Anyone have any experience with the 5T4 - I picked up a couple NOS, in the boxes, very cheap, a while back figuring them as cheaper and more robust replacements for tubes like the 5Y3.

Wayne