QP21 x 2, QP22B x 2, 240B, PD220 push-pull output valves. Heaters OK $17.57 USD Sold on: 2014-Feb-16 Marketplace: eBay 1 Treasure 0 Trash 100% Detail: 6 twin triode and twin pentode push-pull output valves with B7 bases. 2 - QP22P by Mullard - factory codes 976.2 with 2B? and 2BX 2 - QP21 by Marconi and Osram 1 - 240B by Cossor 1 - PD220 by Mazda Ba... More Relevance Historical Items
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