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12Y4

Sensibly equivalent to:
CV523
    
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The 12Y4 is a pair of signal diodes in a classic envelope fitted with a B5 base. It dates to the early 1940's. This exhibit was made by Marconi Canada.
Oliver Palix comments at radiomuseum.org: as with the ARP3, the 12Y4 is used in the WWII Canadian set C52. One for AGC and signal detection, the second as a noise limiter.
The Marconi C52 short wave transceiver was designed for operation from a 12 Volt vehicle battery with a rotary transformer to generate the HT supply. Coverage was 1.75-16 MHz and this medium range set had an output power of 70-100 Watts CW or 45-75 Watts voice.
The diodes stacked on the common cathode.
The classic envelope is 38 mm in diameter, and excluding the B5 base pins is 88 mm tall.
Reference: 3002. Type 12Y4 was first introduced in 1944.

 

Pin Connections
B5
1
2
3
4
5
a(d1)
h
h
a(d2)
k

 

Absolute Maximum Operating Conditions
Diode
Vh
Ah
12.6
0.15
Updated February 17, 2015.
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