The 6J5 is a metal valve without a glass envelope. This exhibit is from RCA who developed the manufacturing technique in 1935 and gave the world the International Octal base.
The American VT series of military designations are quite separate from the UK VT designations.
The 6J5 is a classic design that is an improved version of the original 6C4 from RCA, and appears in many envelope shapes. In dual form the 6J5 becomes the 6SN7 double audio triode. With the anode and control grid taken to top caps the 6J5 became, in essence, the 7193.
See 6J5 for construction details.
The thin metal tube envelope is 24 mm in diameter and, excluding the IO base pins, is 50 mm tall.
Pin Connections
IO |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |

|
m |
h |
a |
nc |
g |
nc |
h |
k |
Absolute Maximum Operating Conditions
Triode |
Vh |
Ah |
Va |
Vg |
mAa |
ra |
gm |

|
6.3 |
0.3 |
250 |
-8 |
9 |
7.7K |
2.6 |
Thanks to Frank Philipse for supplying the above datasheet
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