[MrFixr55]

And send a few to me. A good replacement for WD11s. Dunno how popular 264s are but 864s are getting scarce. I bought 2 NOS Hytron JAN VT24s about 10 years ago from someone on eBay, I think I paid $10 each.

Radiomuseum states that this tube is a new and improved, and rebased WD11 (ANYTHING is an improvement over a WD11).


Following is from RadioMuseum:

Identical to 864 = CV2675 = VT-24 = SE-3864A = 264 = CX864 = 464 = ER864 = TS864 = T-864
Similar Tubes
Normally replaceable-slightly different:
38064 ; FR-300 ; WX12
Predecessor Tubes WD11 UX864
Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bo)
Was used by Radio/TV-reception etc.
Filament Vf 1.1 Volts / If 0.25 Ampere / Direct / Specified voltage AC/DC
Description
Low-microphonic rebased and improved WD11; mu 8.2, Gm 0.65mS.

Sturdy non-microphonic tube for aircraft communication. Airplane vibrations caused noise in the receiver using normal tubes. Three of these tubes used in the RCA 4088 condenser microphone. It was classified for industrial use but was released for general distribution in April 1932.