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L610

Sensibly equivalent to:
CV3538
See also:
Marconi L610 Box
    
Extras ▼

 

The L610 is an example of an early audio output valve designed to drive a loudspeaker in a domestic radio receiver, but 70 mW is not a lot of audio power.. It dates from 1929 and was for battery operation.
Battery-operated low-impedance types such as the L610 were also used in stable, low-drift RF oscillators for driving broadcasting transmitters and similar high-quality equipment.
The etched lettering is on the dome of the envelope.
The interesting thing about this exhibit is that one can see the inner construction and the horizontal electrode assembly.
See also L610 for fuller details.
The balloon envelope is 46 mm in diameter and, excluding the B4 base pins, is 81 mm tall.
References: Datasheet & 1043. Type L610 was first introduced in 1929.

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
Pout
6.0
0.1
150
-9
9.5
3,500
2.3
0.07W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 03, 2013.
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