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TH2321

 
    
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The TH2321 is a triode heptode frequency changer for 200 mA series heater chains. The TH233 is the same basic design but with lower internal capacitancies and the newer MO base.
The reverse is plain zinc paint with the two code letters EW.
The classic envelope is 38 mm in diameter, and excluding the B7 base pins is 103 mm tall.
References: Datasheet, 1040 & 1043. Type TH2321 was first introduced in 1938.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
a(t)
g1(t),g3
g2,g4
h
h
m.k
a
g1

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
23
0.2
150
100
-3.0
3.0
6.0
1M
0.65
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 27, 2014.
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