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R2018

 
See also:
The Azide Process
    
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The R2018 is a general purpose triode with an unusual heater rating. 180 mA is not a common value for series heater chains.
We have a metalaised R2018 as well, plus the audio output triode P2018.
The anode side view. The anode is blackened - unusual for a low power valve. But the power valve P2018 looks identical, so a probable economy of scale.
The identification is etched into the dome of the envelope. The anode rating is given as 20 - 200 Volts. The words Barium tube remain but this valve is of modern construction and not a product of the older Azide process. Within the metal cathode tube is a small diameter ceramic tube and within that a slip coated heater.
The heater top connection connects to the side strut seen in the foreground here. Above the lower mica the grid can be seen.
A μ-Tracer plot of the characteristic curves for this exhibit.
The classic envelope is 37 mm in diameter, and excluding the B5 base pins is 96 mm tall.
Reference: 1043. Type R2018 was first introduced in 1932.

 

Pin Connections
B5
1
2
3
4
5
a
g1
h
h
k

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
20
0.18
200
-2
2.5
13,300
2.5
Updated January 06, 2017.
shape:classic construction:pinch type:triode age:1930.1940 base:b5 pins:5 pin:1.a pin:2.g1 pin:3.h pin:4.h pin:5.k
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