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The Dario TL54 is an audio output pentode rated to give 8.5 Watts into a 3.5 kΩ load. The cathode resistor would be 175 Ω.

The reverse is plain and the inside is blocked by the internal coating.

The top mica is visible but not much else.

The classic envelope is 49 mm in diameter and, excluding the B7 base pins, is 117 mm tall.

Reference: Data. Type TL54 was first introduced in 1938. See also 1938 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶