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DD620

Sensibly equivalent to:
ZD
    
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A pair of signal diodes are to be found in the DD620, A Mazda valve from 1934, intended for use in universal mains sets (transformerless for AC or DC use). For this application the heater cathode insulation has been designed to withstand a high voltage difference.
The large canopy is a screen, the two anodes are within. The lower anode is visible, but the top anode is hidden under the screen.
The envelope on this exhibit is some 9 mm shorter than our other DD620.
The balloon envelope is 40 mm in diameter and, excluding the B5 base pins, is 73 mm tall.
References: Data-sheet & 1040. Type DD620 was first introduced in 1934. See also 1934 adverts.

 

Pin Connections
B5
1
2
3
4
5
a(1)
a(2)
h
h
k

 

Absolute Maximum Operating Conditions
Diode
Vh
Ah
mAa
6.0
0.2
0.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 20, 2013.
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