What is a CV2798 substitute or equivalent?

Direct equivalents to the CV2798 include QQE03/12, RS1029, 6360 family — dual beam tetrode. 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 CV2798?

Transconductance gm ≈ 7 mA/V, max plate voltage 300 V, max plate dissipation 5 W, heater 6.3 V / 0.84 A.

Is the CV2798 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the CV2798 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 CV2798 sound like?

Dual beam tetrode for VHF / transmitting push-pull service; not an EF80-style preamp 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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CV2798 CV2798 / QQE03/12 Tetrode Vacuum Tube

Q: What is the CV2798 vacuum tube?

The CV2798 (CV2798 / QQE03/12) is a tetrode vacuum tube designed for transmitting / push-pull applications. Dual beam tetrode for VHF / transmitting push-pull service; not an EF80-style preamp pentode..

Dual tetrode6.3V / 0.84A9-pin NovalSPICE

SourceCV2798 / QQE03/12 datasheet — dual beam tetrode; corrected type/use/sectionsReviewed2026-05-29StatusDataModelCalcModelKoren pentodePDF

Beam power tetrode rated at 5W for high-power output stages

Datasheet ↗SPICE

CV2798 / QQE03/12 — Mullard — tetrode vacuum tube — (1955)

7.0mA/V

6.2pF

0.1pF

2.70pF

GAIN0%

POWER13%

DRIVE50%

LINEARITY75%

SPECIFICATIONS

Heater6.3 V · 0.84 A

Max Plate Voltage300 V

Pa max5 W

Gain Factor—

gm7 mA/V

rp—

Inter-electrode capacitances

Cgk6.2 pF

Cgp0.08 pF

Cpk2.7 pF

Pinout9-pin Noval

Era1955

RarityModerate

HEATER6.3V / 0.84A

MAX PLATE300V / 5W

BASEnoval

SECTIONS2 (dual)

Source datasheets

1 manufacturer datasheets cross-checked for CV2798 / QQE03/12

1 verified

EXECUTIVE SUMMARY

The CV2798 is a dual indirectly-heated beam tetrode from Mullard, introduced around 1955. Commonly used in transmitting / push-pull applications. Dual beam tetrode for VHF / transmitting push-pull service; not an EF80-style preamp pentode.

APPLICATIONS

Phase splitter

Generic tetrode transmitting / push-pull stage

HISTORY

Introduced1955ManufacturerMullard

Golden Age

CV2798 Datasheet

Local mirror · PDF

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METRIX TESTER

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