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3Q5

Sensibly equivalent to:
CV819 DL33 N16
    
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The 3Q5GT is a battery pentode with a centre tapped filament. When the two halves are in parallel for a 1.4 Volt supply the valve is identical to the 1Q5. But the filaments in series for a 2.8 Volt supply require only 50 mA.
As an audio output valve the maximum output is 500 mW for 10% total harmonic distortion.
The Mullard name on this American designed Pentode.
The electrodes. Note the raised filament tension spring indicating that one half of the filament has failed.
The wide glass tube envelope is 30 mm in diameter, and excluding the IO base pins is 73 mm tall.
References: Datasheet, 1040 & 1043.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
-
f+
a
g2
g1
-
f-
fct

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
rk
rl
Pout
D
1.4
0.1
110
110
-6.6
10.0
1.4
90,000
2.2
-
8,000
0.4W
6%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 27, 2014.
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