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LS9B

Sensibly equivalent to:
CV1658 VT.no80A
See also:
Some Important British Valves
    
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The LS9B follows in a long line of loudspeaker (LS) valves from M-OV. It was the prototype for the Post Office Type 80A and CV1658.
The stick-on label brands the valve as a Marconi procuct. This would normally imply that it was supplied for the professional market.
Seen from the pinch end the notched grid wire supports are clearly visible as is the mica supports and general construction.
The glass rod holds the two filament tensioning springs. In all the filament has four strands within the anode in a W shape.
The balloon envelope is 50 mm in diameter, and excluding the b4 base pins is 93 mm tall.
References: Datasheet, 3002 & 1043.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
μ
2.0
0.15
150
-1.5
-
50,000
30
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 30, 2013.
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