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42

Sensibly equivalent to:
CV609
See also:
CV609 short entry
    
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The 42 is an audio output pentode, with a low output rating, but when used in push pull a pair could deliver 18.5 Watts in class AB2.
Also on a UX6 base is the 2.5 Volt 2A5 that is electrically equal to the type 42. The Type 6F6 is also electrically identical, but on an IO base.
The anode is cylindrical with side fins. The control grid is wound on copper supports with heat sinks on top. The mica supports fit tightly against the glass to prevent movement.
The anode face view. The suppressor grid can be seen in the space between the anode and the top mica.
The classic envelope is 45 mm in diameter and, excluding the UX6 base pins, is 102 mm tall.
References: Datasheet, 1040 & 1043. Type 42 was first introduced in 1936.

 

Pin Connections
UX6
1
2
3
4
5
6
h
a
g2
g1
k
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
6.3
0.7
250
250
-16.5
34
6.5
80k
2.5
3.2W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 07, 2017.
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