What is a 6111 substitute or equivalent?

Direct equivalents to the 6111 include 6112 (low-mu sister). 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 6111?

Amplification factor μ ≈ 20, transconductance gm ≈ 5 mA/V, plate resistance rp ≈ 4.0 kΩ, max plate voltage 165 V, max plate dissipation 1.1 W, heater 6.3 V / 0.3 A.

Is the 6111 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the 6111 as Moderate 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 6111 sound like?

Raytheon subminiature dual triode (sister of 6112). Flying-lead 8-pin construction, no socket. Originally designed for ruggedized military / aerospace amplifiers; now a hi-fi cult favorite for ultra-compact preamp builds.. 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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6111 Triode Vacuum Tube

Q: What is the 6111 vacuum tube?

The 6111 is a triode vacuum tube designed for preamp / driver applications. Raytheon subminiature dual triode (sister of 6112). Flying-lead 8-pin construction, no socket. Originally designed for ruggedized military / aerospace amplifiers; now a hi-fi cult favorite for ultra-compact preamp builds..

Dual triode6.3V / 0.3A8-pin Submini (flying leads)SPICE

SourceRaytheon 6111 datasheet · Reddit /r/diytubes feedbackReviewed2026-05-29StatusDataModelCalcModelNorman KorenPDF

Medium-gain triode for driver and line stage applications

Datasheet ↗SPICE

6111 — Raytheon·GE — triode vacuum tube — (1957)

4.0kΩ

5.0mA/V

1.9pF

1.5pF

0.28pF

GAIN20%

POWER3%

DRIVE96%

LINEARITY90%

SPECIFICATIONS

Heater6.3 V · 0.3 A

Max Plate Voltage165 V

Pa max1.1 W

Gain Factor20

gm5 mA/V

rp4.0 kΩ

Inter-electrode capacitances

Cgk1.9 pF

Cgp1.5 pF

Cpk0.28 pF

Pinout8-pin Submini (flying leads)

Era1957

RarityModerate

HEATER6.3V / 0.3A

MAX PLATE165V / 1.1W

BASEsubmini-8

SECTIONS2 (dual)

Source datasheets

6 manufacturer datasheets cross-checked for 6111

6 verified

TYPICAL OPERATING POINT

Va90V

Ia3.64mA

Vg-3V

Pd0.33W

RL8kΩ

Av22dB

EXECUTIVE SUMMARY

The 6111 is a dual indirectly-heated triode from Raytheon·GE, introduced around 1957. It provides a gain factor (μ) of 20 with 4000Ω plate resistance. Commonly used in preamp / driver applications. Raytheon subminiature dual triode (sister of 6112). Flying-lead 8-pin construction, no socket. Originally designed for ruggedized military / aerospace amplifiers; now a hi-fi cult favorite for ultra-compact preamp builds.

APPLICATIONS

Voltage amplifierPhase splitter

Generic triode preamp / driver stage

• Hi-Fi stereo• Headphone amp

HISTORY

Introduced1957ManufacturerRaytheon·GE

Golden Age

6111 Datasheet

Local mirror · PDF

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METRIX TESTER

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