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PT625

 
    
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The PT625 is a directly heated output pentode. In use the PT625 could deliver an output of two Watts.
To accommodate a pentode design in a five pin base the suppressor grid g3 is internally connected to the control grid g1.
The
The Marconi name is just visible etched in to the side of the envelope.
The dome contains the type description and the origin.
The balloon envelope is 60 mm in diameter and, excluding the B4 base pins, is 121 mm tall.
References: Datasheet & 1043.

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
6.0
0.25
250
200
-15
26.5
-
1.85
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 03, 2013.
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