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DAC32

Sensibly equivalent to:
1H5 1H5GT CV1820 HD14
    
Extras ▼

 

This DAC32 is some 17 mm shorter than other Mullard versions. The height matches the Sylvania version but this is a British Made valve and not an import.
The DAC32 is a dry battery diode triode that was designed, after WWII, for AM broadcast radio reception. Mullard describe this valve as a medium gain triode for use as an AF voltage amplifier combined with a single diode for signal or AVC (AGC) rectification.
The filament power is very low and consequently the valve is rated for a very low current.
The triode is at the top with the diode below. The diode anode is the vertical rod to the right of the filament. The bright rectangle is a shield connected to the filament support.
The electrodes seen end on.
In this image the filament can be seen as a single strand but it is not held in tension.
The wide glass tube envelope is 29 mm in diameter and excluding the IO base pins it is 69 mm tall.
References: Datasheet, 1040 & 1043.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
f+
a
-
a(d)
-
f-
-
g1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
mAa
ra
gm
1.4
0.05
90
0.15
240k
0.275
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 11, 2015.
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