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12Y4Sensibly 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. See also 1944 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 |  a(d1) | h | h | a(d2) | k |
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Absolute Maximum Operating Conditions¶
| Vh | Ah |
| 12.6 | 0.15 |
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Updated February 17, 2015.
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