What is the GP-5 vacuum tube?

The GP-5 (GP-5 / ГП-5) is a triode vacuum tube designed for voltage regulator applications. High-voltage shunt regulator. TV / X-ray..

What is a GP-5 substitute or equivalent?

Direct equivalents to the GP-5 include ED500, 6BK4. 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 GP-5?

Amplification factor μ ≈ 2750, transconductance gm ≈ 0.7 mA/V, plate resistance rp ≈ 3900.0 kΩ, max plate voltage 30000 V, max plate dissipation 37.5 W, heater 6.3 V / 0.21 A.

Is the GP-5 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the GP-5 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 GP-5 sound like?

High-voltage shunt regulator. TV / X-ray.. 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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GP-5 GP-5 / ГП-5 Triode Vacuum Tube

Triode6.3V / 0.21A9-pin Magnoval

SourceFrank/pocnet Svetlana GP-5 · Lampes-et-TubesReviewed2026-05-29StatusDataModelCalcModelunder reviewPDF

Power triode delivering 37.5W for push-pull and SET designs

Datasheet ↗

GP-5 / ГП-5 — Svetlana — triode vacuum tube — (1960)

2750

3900.0kΩ

0.7mA/V

4.0pF

0.1pF

1.50pF

GAIN100%

POWER94%

DRIVE0%

LINEARITY10%

SPECIFICATIONS

Heater6.3 V · 0.21 A

Max Plate Voltage30000 V

Pa max37.5 W

Gain Factor2750

gm0.7 mA/V

rp3900.0 kΩ

Inter-electrode capacitances

Cgk4 pF

Cgp0.1 pF

Cpk1.5 pF

Pinout9-pin Magnoval

Era1960

RarityModerate

HEATER6.3V / 0.21A

MAX PLATE30000V / 37.5W

BASEmagnoval

Source datasheets

1 manufacturer datasheets cross-checked for GP-5 / ГП-5

1 verified

EXECUTIVE SUMMARY

The GP-5 is a indirectly-heated triode from Svetlana, introduced around 1960. It provides a gain factor (μ) of 2750 with 3900.0kΩ plate resistance. Commonly used in voltage regulator applications. High-voltage shunt regulator. TV / X-ray.

APPLICATIONS

SET outputPush-pull outputHigh-gain preamp

Generic triode voltage regulator stage

• Studio/recording• PA/public address

HISTORY

Introduced1960ManufacturerSvetlana

Late Production

GP-5 Datasheet

Local mirror · PDF

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METRIX TESTER

Test this tube on a Metrix

SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.

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