▼ Menu

L77

Sensibly equivalent to:
6C4 CV133 CV1932 EC90 V741
    
Extras ▼

 

The L77 triode was specified as both an amplifier and an RF power valve. In the latter role it would deliver 5.5 Watts. With a very small envelope volume, this would make it ideal for hand portable equipment. In larger apparatus it could deliver enough drive power for much larger PA's.
The anode is a blackened flat sided box with ribs pressed into the sheet metal to give extra mechanical stiffness.
The face view. the side flanges aid radiation and provide a flat area for the fixing notches.
The thin glass tube envelope is 18 mm in diameter and has an overall length, excluding the B7G base pins, of 48 mm.
References: Data-sheet & 1040. Type L77 was first introduced in 1951. See also 1951 adverts.

 

Pin Connections
B7G
1
2
3
4
5
6
7
a
ic
h
h
a
g1
k

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
mAa
gm
Pdriv
Pout
Pdiss
freq
f.max
6.3
0.15
250
10.5
2.2
0.35W
5.5W
5W
70
150
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 08, 2023.
Return to Main Index