Sensibly equivalent¶ to:
6267 6BK8 6F22 CV2901 Z729
The EF86 is the standard early stage audio pre-amplifier valve. This exhibit was made in the 21st century by Tube Audio Doctor.
Its design is low noise and anti-microphonic. In use it is recommended that it is fitted into a vibration resistant base. This has a synthetic rubber mount.
The outer screen obscures all internal construction. Note the newer approach to the connections from the pins - the use of copper.
The thin glass tube envelope is 22 mm in diameter and excluding the B9A base pins, is 48 mm tall.
References: Datasheet & 1040. Type EF86 was first introduced in 1953.
Absolute Maximum Operating Conditions¶
PDF scanned from an original document held by the museum
Updated May 03, 2016. shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.g2 pin:2.s pin:3.k pin:4.h pin:5.h pin:6.a pin:7.s pin:8.g3 pin:9.g1