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PT4D

Sensibly equivalent to:
AC2/Pen/DD DDPP4B DN41
    
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The PT4D is a directly heated double diode output pentode. The PT4 was originally designed for when a directly heated valve was required and had slightly less output than the MPT4.
The cathode resistor is given as 150 Ω and the anode load is 6,500 Ω.
Thanks to Bob Hopkins for sending the image.
The classic envelope is  mm in diameter and, excluding the B7 base pins, is mm tall.
References: Datasheet & 1043. Type PT4D was first introduced in 1934.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
a(d2)
a
a(d1)
h
h
k
g2
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
4.0
2.0
250
250
-6
32
7.0
-
7.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December14, 2012.
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