A pair of 12BH7 / 12BH7A dual-triode vacuum tubes. Structurally verified as RCA production, since the numbers are worn off. Model 257 or 151 tester on 6/25/26. These feature the classic long gray plates and top halo getters.
A pair of 12BH7 / 12BH7A dual-triode vacuum tubes. Structurally verified as RCA production, since the numbers are worn off. Model 257 or 151 tester on 6/25/26. These feature the classic long gray plates and top halo getters.