6AU4

Name: 6AU4
Brand: RCA

Rectifier — Octal — RCA

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Data: HighHigh quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.

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Known Equivalents & Substitutes

6AU4GT6AU4GTA

Similar Tubes (Not Drop-In Compatible)

12D4

Same half-wave TV damper family but 12.6V heater — not interchangeable without heater string redesign

6AX4GTB

Half-wave Octal TV damper rectifier — lower PIV (4400V vs 4500V), lower peak plate current

Electrical Specifications

Absolute Maximum

Anode Dissipation (max)Plate Dissipation (max)6.5W

Heater-to-Cathode Voltage (max)Peak Heater-Cathode Voltage (heater negative)4,500V

Rectifier

Peak Inverse VoltagePeak Inverse Plate Voltage4,500V

Voltage Drop (typical)Tube Voltage Drop (derived at Ib=210 mA DC)20V

Notes

Pin 2 is an internal connection — do not use as a tie point.
Socket terminals 1, 2, 4, and 6 should not be used as tie points.
On the 5-pin base, pin 1 as well as pins 4 and 6 is omitted.
Peak inverse plate voltage rating of 4500V applies for operation in a 525-line, 30-frame system.
DC component of plate voltage must not exceed 900V.
DC component of heater-cathode voltage must not exceed 100V.
6AU4GT and 6AU4GTA are envelope/rating variants — pin-compatible drop-in replacements.
Tube voltage drop (Vdrop) is not stated as a discrete figure in the RCA 6AU4-GTA datasheet. Derived from the Average Plate Characteristic curve (92CS-8651R1, Ef=6.3V) at the maximum DC plate current of 210 mA, where plate voltage reads approximately 20 V.

Pin Layout — Octal