TD3A

The TD3A is a 4.7mA 18pF germanium tunnel diode. Tek used part number 152-0125-00 to refer to them. According to Stan Griffiths, they were used in: 1L40, 1S1, 1S2, 11B1, 11B2, 11B2A, 147A, 1470, 148, 21A , 22A, 3B4, 3B5, 408, 432, 434, 453, 453A, 454, 466, 491, 5T3, 544, 546, 547, 556, 7B70, 7B71, and 7D11.