The HP210 is a low-microphony screened RF amplifier pentode designed for radio use. It is directly heated and was designed for use with battery supplies for both HT and LT. The HP210 was made in two forms one with a B4 base and the other with a B7 base. The B7 base itself was introduced in 1933.
The classic envelope is 43 mm in diameter and, excluding the B7 base pins, is 108 mm tall.
References: 1043. Type HP210 was first introduced in 1934. See also 1934 adverts.
Absolute Maximum Operating Conditions¶
Updated January 07, 2022.