4-400 SOCKET-WHATS IT FROM?

[W2PFY]

has anyone seen this socket and tell me what kind of transmitter it came from. T-368??

[k7yoo]

NOT T-368 or SRT 16
My guess is that this socket originally housed a 4-125 (just a guess)
It reminds me of some 4-65 and 4D32 sockets that I salvaged from military and FAA stuff
Skip

[K5UJ]

Yes, see the socket itself looks like a standard good porcelain socket but the mount for it with the air holes for pressurized air make it look like it was intended for some tube in a chimney that did not have a base with built-in air holes.   The 4-400 has the base with the air holes for chimney use so I bet the original intent was for some other tube with just the glass bulb and pins at the bottom.   It looks like it would be perfect if you wanted to put a 3-500 in a chimney. 

Rob

[W2PFY]

I bet the original intent was for some other tube with just the glass bulb and pins at the bottom

What is not shown is a clamp that went around the metal base of the tube. I removed it so it be easier to get the tube in & out. Therefore, I don't think it was for a all glass tube.

This socket could have been used in a HV regulator or perhaps a laser exciter??

[KM1H]

It almost looks homebrew using a standard Johnson socket and an available metal base with the slots added later, the metalwork looks a bit rough.

The 3CX1200 series will fit in there and the construction reminds me of Henry.

Carl

[W2PFY]

The 3CX1200 series will fit in there and the construction reminds me of Henry.

you might be on to something. This does look to be the metal color of Henry Plasma generators I have seen.

[K5UJ]

I just realized the rectangular cut-out is not every 90 degrees all the way around.  That lets out the idea it was for a glass tube lacking a cooling base.   I can picture a ceramic tube in there with the anode in one of those ceramic tube chimneys so there is enough back pressure to make it okay to have one cut-out.