▼ Menu

QP240

 
See also:
Quiescent Push-Pull
    
Extras ▼

 

The QP240 is a battery audio output double pentode. With an output load of 15 kΩ the output would be 2.25 Watts.
The sections were labelled A and B on the base.
The two sections with bright anodes.
The connections above the pinch show where the sections are connected in parallel.
The identification is on the dome of envelope. Inside can be seen the filament tension springs and the shaped wire grids.
The balloon envelope is 39 mm in diameter and, excluding the B9 base pins, is 89 mm tall.
References: Data-sheet & 1043. Type QP240 was first introduced in 1934.

 

Pin Connections
B9
1
2
3
4
5
6
7
8
9
g1(a)
a(a)
g2(a)
f
f
-
g2(b)
a(b)
g1(b)

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
2.0
0.45
150
130.5
-10.3
2.0
0.45
4.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 20, 2021.
Return to Main Index