The WD142 is a variable μ pentode and a single diode package. The Mullard UAF42 is its equivalent. This type of valve was designed for radio receivers. The variable μ characteristic enables the gain to be varied according to signal strength via an AGC circuit. This valve could have been used for AGC detection and as final IF amplifier.
The thin glass tube envelope is 20 mm in diameter and, excluding the B8A base pins, is 52 mm tall.
Pin Connections
|
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
|
h |
a |
a(d) |
g3 |
g2 |
g1 |
k |
h |
Absolute Maximum Operating Conditions
|
Vh |
Ah |
Va |
Vs |
Vg |
mAa |
mAs |
ra |
gm |
|
12.6 |
0.1 |
200 |
115 |
-2.4 |
6.0 |
1.9 |
1.3M |
1.9 |
This exhibit was last updated on 08 May 2006 |
|
