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VX7508

 
    
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The VX7508 is a lab sample produced by Brimar. Internally it is a double triode but no details of this valve have yet been found.
The pin assignments match those of the standard double triodes such as the ECC82 but the sections have smaller anodes.
The twin sections are mounted side by side with no screen between them. This suggests a low frequency application.
The folded and stitched anode. The grid supports are copper and the heater wire is an insulated coil.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 48 mm tall.
Reference: Observation.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
a(2)
g1(2)
k(2)
h
h
a(1)
g1(1)
k(1)
hct

 

Updated November 13, 2025.
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