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33HE7

 
    
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The 33HE7 is a diode beam tetrode. The design purpose was as a damping (efficiency) diode and line output valve in TV receivers.
The 33HE7 is part of a compactron series that differ only in heater specifications: 6HE7, 12HE7 and 58HE7.
The efficiency diode anode.
The beam tetrode on the left with the diode on the right. Note the diameter of the diode cathode - this is a heavy duty device.
The wide glass tube envelope is 38 mm in diameter, and excluding the B12C base pins is 68 mm tall.
Reference: Datasheet. Type 33HE7 was first introduced in 1973.

 

Pin Connections
B12C
1
2
3
4
5
6
7
8
9
10
11
12
h
a(d)
-
k(d)
a
-
ic
k,bp
g1
ic
g2
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
33
0.3
200
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December27, 2016.
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