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Wireless World, February, 1957.

Valves advertised:
TY7-6000A, TY7-6000W, TY6-5000A, TY6-5000W, QY5-3000A, QY5-3000W, TY4-500, TY4-350, QY4-250, QY4-500A, TY3-250, TY2-125, QY3-125, QY3-65, QV1-150A, QQV06-40A, QQV07-40, QV06-20, QQV03-20A, TD1-100A, QQV04-15, TD04-20, QQV03-10, QV03-12, QV04-7, QQV02-6, TD03-10, TD03-10F & TD05-12.
    
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