This exhibit is the Moorhead Special transmitting valve that was made for the US market. The internal gettering gives the glass a gold appearance.Thanks to Joe Gruber for sending the images.The balloon envelope is mm in diameter and, excluding the base pins, is mm tall.Reference: Joe Gruber. Type Moorhead-Special was first introduced in 1917. |
Pin Connections
| 1 | 2 | 3 | 4 |  g1 | f | f | a |
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Updated June 13, 2020. shape:balloon construction:pinch type:triode age:pre.1920 base:uv pin:1.g1 pin:2.f pin:3.f pin:4.a
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