▼ Menu

DD620

Sensibly equivalent to:
ZD
    
Extras ▼

 

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: Datasheet & 1040. Type DD620 was first introduced in 1934.

 

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.
shape:balloon construction:pinch type:double.diode age:1930.1940 base:b5 heater:6.0v pins:5 pin:1.a(1) pin:2.a(2) pin:3.h pin:4.h pin:5.k
Return to Main Index