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| 15D1, 9D2, 11D3, 1DD1, 4D1, 7D3, 7D6, 7D8, 7A3, R2 & 1D5 Advert. •Wireless Retailer and Broadcaster •October 17, 1936 |
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| 6BE6, 6BA6, 6AT6, 6AQ5, 6X4, 12BE6, 12BA6, 12AT6, 35L6GT, 35W4, 6AK6, 1S5, 1U5, 3S4, 3V4, 1R5 & 1T4 Advert. •Wireless World •September, 1952. |
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