What is the 7027A vacuum tube?

The 7027A is a tetrode vacuum tube designed for power (pp) applications. High-voltage 6L6. Ampeg bass tone..

What is a 7027A substitute or equivalent?

Direct equivalents to the 7027A include 6L6GC (higher voltage). 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 7027A?

Transconductance gm ≈ 6 mA/V, plate resistance rp ≈ 22.5 kΩ, max plate voltage 600 V, max plate dissipation 35 W, heater 6.3 V / 0.9 A.

Is the 7027A still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the 7027A as Sought-after 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 7027A sound like?

High-voltage 6L6. Ampeg bass tone.. 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

←7027A

← 6Y6GT 7044 →Compare…

7027A Tetrode Vacuum Tube

Tetrode6.3V / 0.9AOctal

SourceRCAReviewed2026-05-29StatusDataModelCalcModelunder reviewPDF

Beam power tetrode rated at 35W for high-power output stages

Datasheet ↗

7027A — RCA — tetrode vacuum tube — (1958)

22.5kΩ

6.0mA/V

10.0pF

1.5pF

7.50pF

GAIN0%

POWER88%

DRIVE78%

LINEARITY75%

SPECIFICATIONS

Heater6.3 V · 0.9 A

Max Plate Voltage600 V

Pa max35 W

Gain Factor—

gm6 mA/V

rp22.5 kΩ

Inter-electrode capacitances

Cgk10 pF

Cgp1.5 pF

Cpk7.5 pF

PinoutOctal

Era1958

RaritySought-after

HEATER6.3V / 0.9A

MAX PLATE600V / 35W

BASEoctal

Source datasheets

1 manufacturer datasheets cross-checked for 7027A

1 verified

EXECUTIVE SUMMARY

The 7027A is a indirectly-heated beam tetrode from RCA, introduced around 1958. Commonly used in power (pp) applications. High-voltage 6L6. Ampeg bass tone.

APPLICATIONS

High-power output

Generic tetrode power (pp) stage

• PA/public address

HISTORY

Introduced1958ManufacturerRCA

Golden Age

7027A Datasheet

Local mirror · PDF

↗

METRIX TESTER

Test this tube on a Metrix

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

SIMILAR TETRODES

View all →

12E1Power 1614Power (PP)1625Transmitting / Power 4Y100ROutput Power 4Y75ROutput Power 5881Power (PP)5AQ5Power 5V6Power