What is a A2134 substitute or equivalent?

Direct equivalents to the A2134 include CV4062, CV2179, E2134 — verify against primary datasheet; not confirmed as EL84 drop-in. 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 A2134?

Amplification factor μ ≈ 220, transconductance gm ≈ 9.5 mA/V, plate resistance rp ≈ 23.2 kΩ, max plate voltage 300 V, max plate dissipation 9 W, heater 6.3 V / 0.635 A.

Is the A2134 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the A2134 as Common 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 A2134 sound like?

Special-purpose pentode; classification and substitution require primary datasheet verification.. 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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A2134 Pentode Vacuum Tube

Q: What is the A2134 vacuum tube?

The A2134 is a pentode vacuum tube designed for power applications. Special-purpose pentode; classification and substitution require primary datasheet verification..

Pentode6.3V / 0.635A7-pin Miniature B7GSPICE

SourceA2134 data conflict — EL84-equivalent wording removed pending primary datasheet verificationReviewed2026-05-29StatusDataModelCalcModelKoren pentodePDF

Small-signal pentode for low-noise voltage amplification

Datasheet ↗SPICE

A2134 — Mullard — pentode vacuum tube — (1955)

220

23.2kΩ

9.5mA/V

10.0pF

0.3pF

10.00pF

GAIN100%

POWER23%

DRIVE77%

LINEARITY10%

SPECIFICATIONS

Heater6.3 V · 0.635 A

Max Plate Voltage300 V

Pa max9 W

Gain Factor220

gm9.5 mA/V

rp23.2 kΩ

Inter-electrode capacitances

Cgk10 pF

Cgp0.3 pF

Cpk10 pF

Pinout7-pin Miniature B7G

Era1955

RarityCommon

HEATER6.3V / 0.635A

MAX PLATE300V / 9W

BASEb7g

Source datasheets

1 manufacturer datasheets cross-checked for A2134

1 verified

Triode-connectedMarconi's Wireless Telegraph CMARCH 1955

Specs when the screen grid (g2) is tied to the anode — the tube acts as a triode.

165 V

Vg1

-9 V

9.5 mA/V

According to Marconi's Wireless Telegraph Company Limited (Chelmsford) (MARCH 1955): « Triode connection »

EXECUTIVE SUMMARY

The A2134 is a indirectly-heated pentode from Mullard, introduced around 1955. It provides a gain factor (μ) of 220 with 23.2kΩ plate resistance. Commonly used in power applications. Special-purpose pentode; classification and substitution require primary datasheet verification.

HISTORY

Introduced1955ManufacturerMullard

Golden Age

A2134 Datasheet

Local mirror · PDF

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