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HP211C

 
    
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The HP211 and HP211C from Tungsram are vari-μ RF pentodes that operate from battery supplies. We can not, as yet, find out what made the 1937 HP211C different from the 1934 original. Both were made with B4 or B7 base caps.
The glass is clear but little of the internal structure is clear.
The B4 Base.
Thanks to Mark Mallison for sending the images.
The classic envelope is  mm in diameter, and excluding the B4 base pins is  mm tall.
Reference: 1043. Type HP211C was first introduced in 1937.

 

Pin Connections
B4
1
2
3
4
tc
g2
g1
f
f
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
2.0
0.12
150
150
-0.9
2.6
0.6
2M
1.7
Updated December08, 2018.
shape:classic construction:pinch type:pentode age:1930.1940 base:b4 heater:2.0v pins:4 pin:1.g2 pin:2.g1 pin:3.f pin:4.f pin:tc.a
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