On 17 Jun 2013 at 16:45, Robert Eleazer wrote: > 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. 1550 PIV, 675 mA per plate. Filament: 5.0 V 2.0 amps. About 1/2 way between the 5Y3 and the 5U4 Ken W7EKB