[R-390] CV133 vs 6C4

[Andy Jackson G8JAC]

Russian?  How dare you sir!

The CV stands for Common Valve (so not surprising that you guys over there
don't recognise it as a "tube")!
It is a series of devices approved to a common British specification with,
mostly, equivalents in the commercial world.
CV133 is indeed, equivalent to a 6C4, A.K.A. in europe as the EC90.
The CV2842 is the equivalent of the 6C4W.
CV5183 is the 6C4WA that also meets JAN approval specifications,  and CV4058
is a 6C4WA that meets British military secs.

73,
Andy G8JAC



Previous people said:

|>I'm guessing from what little I could find that the CV is Russian
|>or another eastern block designation.
|>`

|>> Is the CV133 the British version of the 6C4? Is it the british mil-spec
|>> version? (I'm not all that familiar with British tube numbering, I'm
|>> deeply suspicious of any tube that says "ECC" on it too!)
|>>
|>> Or am I wrong and "CV133" is a Russki marking?
|>