What is the EFL200-Pre vacuum tube?

The EFL200-Pre (EFL200 (Pre)) is a pentode vacuum tube designed for preamp applications. Preamp section..

What is a EFL200-Pre substitute or equivalent?

Direct equivalents to the EFL200-Pre include 6Y9. 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 EFL200-Pre?

Amplification factor μ ≈ 38, transconductance gm ≈ 22 mA/V, plate resistance rp ≈ 33.0 kΩ, max plate voltage 250 V, max plate dissipation 5 W, heater 6.3 V / 0.83 A.

Is the EFL200-Pre still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the EFL200-Pre 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 EFL200-Pre sound like?

Preamp section.. 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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EFL200-Pre EFL200 (Pre) Pentode Vacuum Tube

Pentode6.3V / 0.83ADecalSPICE

Sourcerfparts EFL200/6Y9 frame-grid pentodeReviewed2026-05-29StatusDataModelCalcModelKoren pentodePDF

Small-signal pentode for low-noise voltage amplification

Datasheet ↗SPICE

EFL200 (Pre) — Philips — pentode vacuum tube — (1960)

33.0kΩ

22.0mA/V

12.5pF

0.1pF

6.50pF

GAIN38%

POWER13%

DRIVE67%

LINEARITY81%

SPECIFICATIONS

Heater6.3 V · 0.83 A

Max Plate Voltage250 V

Pa max5 W

Gain Factor38

gm22 mA/V

rp33.0 kΩ

Inter-electrode capacitances

Cgk12.5 pF

Cgp0.1 pF

Cpk6.5 pF

PinoutDecal

Era1960

RarityModerate

HEATER6.3V / 0.83A

MAX PLATE250V / 5W

BASEdecal

Source datasheets

2 manufacturer datasheets cross-checked for EFL200 (Pre)

2 verified

EXECUTIVE SUMMARY

The EFL200-Pre is a indirectly-heated pentode from Philips, introduced around 1960. It provides a gain factor (μ) of 38 with 33.0kΩ plate resistance. Commonly used in preamp applications. Preamp section.

HISTORY

Introduced1960ManufacturerPhilips

Late Production

EFL200-Pre Datasheet

Local mirror · PDF

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METRIX TESTER

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