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Deforest Audion metal base display tube 1920's (single)
DV-5 Deforest Isolantite base used/good 1920's (single)
PT-210 Balloon engraved base NOS 1920's (29ma Gm=2000)
UV-202 Radiotron "brass base" and tipped NOS original box 1920 era (45ma) (very rare)
