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Tube Tinker — Electron Tube Database

Tube cross-reference

N309 alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the N309 power - pentode single (not beam) (under 10w). Compare core specifications and verify every restriction before using a replacement.

Replacement tubes for N309

The following tubes are recorded as possible replacements for N309. This direction does not establish that N309 can replace them.

15A6

Power - Pentode Single (NOT beam) (under 10W)

American To Foreign

The database records 15A6 as a possible replacement forN309.

No special restrictions are recorded for this substitution.

SpecificationOriginal tubeReplacement
Tube typePower - Pentode Single (NOT beam) (under 10W)Power - Pentode Single (NOT beam) (under 10W)
ConstructionPentodePentode
BaseNot recorded9AR
SocketB9AB9A
Base pins99
Sections11
Heater voltage15 V15 V
Heater current0.3 A0.3 A

Where N309 can be used as the replacement

In these recorded relationships, N309 is the replacement tube. The listed original tubes are not automatically suitable as replacements for N309.

15A6

Power - Pentode Single (NOT beam) (under 10W)

Foreign To American

The database records N309 as a possible replacement for15A6.

No special restrictions are recorded for this substitution.

SpecificationN309 replacementOriginal tube
Tube typePower - Pentode Single (NOT beam) (under 10W)Power - Pentode Single (NOT beam) (under 10W)
ConstructionPentodePentode
BaseNot recorded9AR
SocketB9AB9A
Base pins99
Sections11
Heater voltage15 V15 V
Heater current0.3 A0.3 A

Verify before substituting

Matching a base or heater voltage is not enough to prove that two tubes are interchangeable. Check pin connections, heater current, maximum ratings, bias requirements, warm-up behavior, and the equipment manufacturer’s service documentation before making a substitution.

View the complete N309 specifications →