pentode EF86 Tesla - (NOS)
Electron tube EF86 is a pre-amplifier pentode designed to be low noise and anti-microphonic. It is direct replacement for 6CF8, 6BK8, 6267 and russian 6Ж32П tubes. Made in former Czechoslovakia in years 1963 - 1964. Tubes are in original boxes. OTK stamp. Tested on BM215A tube tester.
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