What is the E280F vacuum tube?

The E280F is a pentode vacuum tube designed for preamp applications. Small-current professional pentode..

What is a E280F substitute or equivalent?

Direct equivalents to the E280F include 7722. These share the same pinout and operating envelope, so they can usually be swapped without circuit changes — though batch-to-batch variations between manufacturers (NOS vs current production) may shift the sonic character noticeably.

What are the key specifications of the E280F?

Amplification factor μ ≈ 60, transconductance gm ≈ 26 mA/V, plate resistance rp ≈ 100.0 kΩ, max plate voltage 220 V, max plate dissipation 4 W, heater 6.3 V / 0.315 A.

Is the E280F still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the E280F as Rare availability. NOS (new-old-stock) examples from RCA, Mullard, Tung-Sol, GE, Sylvania and Telefunken trade among collectors; modern production where it exists comes mostly from JJ Electronic, Electro-Harmonix, Tung-Sol (New Sensor), Genalex, and a handful of small-batch makers.

What does the E280F sound like?

Small-current professional pentode.. Sonic character also depends heavily on the circuit operating point, the surrounding tubes in the stage, and the output transformer when present — use the interactive loadline calculator on this page to explore the trade-offs.

By Jean-Michel Falligan Devergne · Reviewed May 29, 2026

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E280F Pentode Vacuum Tube

Pentode6.3V / 0.315A9-pin Noval

SourceSiemens E280F/7722 datasheetReviewed2026-05-29StatusDataModelCalcModelunder reviewPDF

Small-signal pentode for low-noise voltage amplification

Datasheet ↗

E280F — Siemens — pentode vacuum tube — (1962)

100.0kΩ

26.0mA/V

9.3pF

0.0pF

2.60pF

GAIN60%

POWER10%

DRIVE0%

LINEARITY70%

SPECIFICATIONS

Heater6.3 V · 0.315 A

Max Plate Voltage220 V

Pa max4 W

Gain Factor60

gm26 mA/V

rp100.0 kΩ

Inter-electrode capacitances

Cgk9.3 pF

Cgp0.035 pF

Cpk2.6 pF

Pinout9-pin Noval

Era1962

RarityRare

HEATER6.3V / 0.315A

MAX PLATE220V / 4W

BASEnoval

Source datasheets

2 manufacturer datasheets cross-checked for E280F

2 verified

EXECUTIVE SUMMARY

The E280F is a indirectly-heated pentode from Siemens, introduced around 1962. It provides a gain factor (μ) of 60 with 100.0kΩ plate resistance. Commonly used in preamp applications. Small-current professional pentode.

APPLICATIONS

Voltage amplifier

Generic pentode preamp stage

HISTORY

Introduced1962ManufacturerSiemens

Late Production

E280F Datasheet

Local mirror · PDF

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METRIX TESTER

Test this tube on a Metrix

SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.

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