(Osram HL2, L63, KTZ63, KT2, KT33C, KT61, KT66 & PX4. Advert)

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Wireless World, March, 1948.

Valves Advertised:

HL2, L63, KTZ63, KT2, KT33C, KT61, KT66 & PX4.

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