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25X4G

 
    
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The 25X4G is a half wave rectifier. The 300 mA heater rating indicates use as part of a series heater chain and confirms that this rectifier was aimed at sets without a mains transformer and so could be used on both AC and DC mains. The reservoir capacitor has a maximum value of 35 μF and a series resistance is required to limit the peak cathode current.
This view shows that there are two rectifier sections within the envelope - connected in parallel.
Thanks to Mark from Vintage-parts for sending these images.
The thin glass tube envelope is  mm in diameter, and excluding the IO base pins is  mm tall.
Reference: 3002.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
-
h
-
-
a
-
h
k

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
mAa
25.0
0.3
250
20.0
Updated March 20, 2017.
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