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.

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..

Also known as CV4062 · CV2179 · E2134 — verify against primary datasheet · not confirmed as EL84 drop-in

Small-signal pentode for low-noise voltage amplification

PentodeHeater 6.3 V · 0.635 A7-pin Miniature B7GMullard 1955

Plate dissipation: 9W
Max plate voltage: 300V
Transconductance: 9.5mA/V

A2134

Characteristics

Datasheet values, once each. Every value cites its sheet.

HeaterIndirectly heated

Specifications of A2134 — Heater
Heater voltageVh	6.3 V
Heater currentIh	0.635 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of A2134 — Limiting values
Plate voltageVa max	300 V
Plate dissipationPa max	9 W

Mechanical

Specifications of A2134 — Mechanical
Base	7-pin Miniature B7G
Rarity	Common
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of A2134 — Small signal
Transconductance	9.5 mA/V
Plate resistance	23.2 kΩ
Amplification factor	220

Capacitances

Specifications of A2134 — Capacitances
Input	10 pF
Grid–plate	0.3 pF
Output	10 pF

Charactereditorial reading, not a measurement

Specifications of A2134 — Character
Gain	100%
Power	23%
Drive	77%
Linearity	10%

datasheet cited · model or editorial reading · catalogue value, no citation attached yet · nothing invented

Typical operation

Conditions published by the manufacturers, one row per condition. Nothing is computed.

Typical operation
Setup	Va	Vg2	Vg1 / Rk	Ia	Ig2	Load	Pout	THD	Source
Class A, single-endedpentode connection · cathode bias	100 V	100 V	100 Ω	39 mA	6.5 mA	2.5 kΩ	1.45 W	8.6%	OCR, to be checked Marconi's Wireless Telegraph Company Limited · 1955 · p. 1 · transcript
Class AB1, push-pullpentode connection · cathode bias · values for two tubes	100 V	100 V	120 Ω	70 mA	12 mA	3 kΩ a-a	2.25 W	3.3%	OCR, to be checked Marconi's Wireless Telegraph Company Limited · 1955 · p. 2 · transcript
Class AB1, push-pulltriode connection · cathode bias · values for two tubes	165 V		330 Ω	65 mA		3 kΩ a-a	2.6 W	1.4%	OCR, to be checked Marconi's Wireless Telegraph Company Limited · 1955 · p. 2 · transcript

Using this tube

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Sources

By Jean-Michel Falligan DevergneReviewed May 29, 2026Source : A2134 data conflict — EL84-equivalent wording removed pending primary datasheet verificationActive model : Koren pentode

Manufacturer datasheets

1 manufacturer datasheets cross-checked for A21341 verified

Triode-connectedMarconi's Wireless Telegraph CMARCH 1955

Va: 165 V
Vg1: -9 V
gm: 9.5 mA/V
µ: 12

A2134 DatasheetLocal mirror · PDF

SPICE models

Revision and verification status

Source: A2134 data conflict — EL84-equivalent wording removed pending primary datasheet verification
Reviewed: 2026-05-29
Status: DataModelCalc
Model: Koren pentode

Context

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

Introduced: 1955
Manufacturer: Mullard
Era: Golden Age

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