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.

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..

Also known as QQE03 · 12 · RS1029 · 6360 family — dual beam tetrode · not a preamp pentode

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

Dual tetrodeHeater 6.3 V · 0.84 A9-pin Noval2 sectionsMullard 1955

Plate dissipation: 5W
Max plate voltage: 300V
Max screen voltage: 200V
Max cathode current: 50mA
Transconductance: 7mA/V

CV2798

Characteristics

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

HeaterIndirectly heated

Specifications of CV2798 — Heater
Heater voltageVh	6.3 V
Heater currentIh	0.84 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of CV2798 — Limiting values
Plate voltageVa max	300 V
Screen voltageVg2 max	200 V
Plate dissipationPa max	5 W
Screen dissipationPg2 max	1 W
Cathode currentIk max	50 mA
Heater–cathode voltageVhk max	100 V

Mechanical

Specifications of CV2798 — Mechanical
Base	9-pin Noval
Rarity	Moderate
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of CV2798 — Small signal
Transconductance	7 mA/V

Capacitances

Specifications of CV2798 — Capacitances
Input	6.2 pF
Grid–plate	0.08 pF
Output	2.7 pF

Charactereditorial reading, not a measurement

Specifications of CV2798 — Character
Gain	0%
Power	13%
Drive	50%
Linearity	75%

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

Using this tube

Applications

Phase splitter

Generic tetrode transmitting / push-pull stage

Replace or compare

Sources

By Jean-Michel Falligan DevergneReviewed May 29, 2026Source : CV2798 / QQE03/12 datasheet — dual beam tetrode; corrected type/use/sectionsActive model : Koren pentode

Manufacturer datasheets

1 manufacturer datasheets cross-checked for CV2798 / QQE03/121 verified

CV2798 DatasheetLocal mirror · PDF

SPICE models

Revision and verification status

Source: CV2798 / QQE03/12 datasheet — dual beam tetrode; corrected type/use/sections
Reviewed: 2026-05-29
Status: DataModelCalc
Model: Koren pentode

Context

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.

History

Introduced: 1955
Manufacturer: Mullard
Era: Golden Age

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