21EX6

Beam Tetrode — Octal

Known Equivalents & Substitutes

No known equivalents. If you know of any, use the ⚑ Report Issue button above.

Similar Tubes (Not Drop-In Compatible)

Same tube family, same 21V/0.6A heater — verify exact interchangeability for specific application

Same tube family but 26.5V/0.45A heater — different heater voltage

Electrically identical but 6.3V/2.5A heater — not a drop-in in 21V series heater circuits

6EX6

Same tube family with 6.3V heater — not a drop-in in 21V circuits

Electrical Specifications

Section 1 — Beam Tetrode

Absolute Maximum

Anode Voltage (max)DC Plate-Supply Voltage (max)990V

Screen Voltage (max)DC Screen Grid Voltage (max)190V

Anode Dissipation (max)Plate Dissipation (max)24W

Screen Dissipation (max)Screen Dissipation (max)3.2W

Cathode Current (max)Cathode Current (max, average)

Notes

21V heater version of the 6DQ5/6EX6 horizontal-deflection tube family. Heater current is 0.6A at 21V.
The plate (anode) connection is via a top cap — this provides high-voltage insulation needed for TV horizontal deflection service.
Pins 1 and 5 are both Grid No.1; pins 3 and 6 are both Cathode/Suppressor Grid (G3); pins 4 and 8 are both Screen Grid (G2). Dual connections provide low-inductance paths.
Maximum peak positive-pulse plate voltage of 6500V applies only when pulse duration does not exceed 15% of one horizontal scanning cycle.
The DC component of heater-cathode voltage must not exceed 100V.

Pin Layout — Octal

1Control Grid (G1)

2Heater

3Cathode

Socket-Compatible Tubes ⚠ Not electrically compatible

References