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4328A

Sensibly equivalent to:
328A CV2619
    
Extras ▼

 

The 4328A is a low power amplifier pentode from STC. It was probably designed for use in telephone repeaters but the data does not specify a design purpose.
The Type is also printed on the reverse. The 4 prefix indicates a UK STC made valve the 328A would be an American product from ITT if it existed.
The outer woven screen with cylindrical anode within. Three wire grids and an oxide coated cathode tube.
The top mica components with the control grid heat radiating fins and connection to the top cap.
The classic envelope is 38 mm in diameter and, excluding the UX6 base pins, is 108 mm tall.
Reference: Data-sheet.

 

Pin Connections
UX6
1
2
3
4
5
6
tc
h
a
g2
g3
k
h
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
7.5
0.425
250
135
-3.0
5.5
-
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 10, 2021.
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