▼ Menu

W143

Sensibly equivalent to:
7B7 7H7 CV303 EF22 W148
    
Extras ▼

 

The W143 is a variable μ amplifier pentode. It is equivalent to the Mullard EF22 and our EF22 exhibit looks very much like this valve, to the point where they probably came off the same Philips production line.
The 'Made in Holland' suggests Philips.
The wide glass tube envelope is 27 mm in diameter, and excluding the B8B base pins is 61 mm tall.
References: Datasheet & 1040.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
h
a
g2
g3,s
-
g1
k
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.2
250
100
-2.5
6
1.7
1.2M
2.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 04, 2014.
Return to Main Index