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1638

Sensibly equivalent to:
VR54
    
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The RCA 1638 is a double diode for signal rectification or other low level duties. The glass envelope has been screened with an external copper metalisation that has then be painted bright red.
It is possible that the 1638 was not an RCA Type code but a production code for the UK VR54 specification that also appears on the envelope.
The metalisation obscures the internal structure completely. Radiotron is an RCA trade name.
These valves were made for British service use and the envelope carries the RAF code VR54 as well.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins, is 59 mm tall.
References: Datasheet, 1040 & 1043. Type 1638 was first introduced in 1941.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
a(2)
k(2)
a(1)
-
h
k(1)

 

Absolute Maximum Operating Conditions
Diode
Vh
Ah
Va
mAa
6.3
0.2
200
0.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 05, 2013.
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