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L63

Sensibly equivalent to:
6C5 6J5G CV1067 CV1932 POVT154 VR67
See also:
Osram L63, KT66, B65 & U52 Advert
    
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The L63 was an Octal based general purpose amplifier triode from M-OV - here with the Osram brand label. It featured the then (1938) new standard 6.3 Volt heater. This was a low power heater insulated with alumina.
L63 is taller and features an all plastic base cap, this example has a metal skirt to the base and looks earlier. Through the glass can be seen the flat anode.
The Osram label. Through the glass the side of the anode can be seen, also the 'fingers' holding the top mica in place. These four metal strips make contact with the inner coating. It is possible that this is a carbon deposit and acts as an internal screen.
The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 76 mm tall.
References: Private communication, data-sheet & 1043. Type L63 was first introduced in 1938. See also 1938 adverts.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
a
nc
g1
nc
h
k

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
250
-8
9.0
7,700
2.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 06, 2022.
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