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Power - Beam (NOT sweep) ·BeamPower

7027A

Higher-rated 7027-family beam-power tube designed for high-fidelity audio output, with substantial Class-A and push-pull Class-AB1 power capability.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7AC
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 900 mA

Description

7027A is a BeamPower vacuum tube documented in the RCA Receiving Tube Manual. The supplied excerpt was reviewed for heater data, section arrangement, maximum ratings, electrical characteristics, interelectrode capacitances, typical operating conditions, and stated applications.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7AC
Socket code
IO
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
900 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7AC - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1Pin 1—NCVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN2Pin 2—H — HeaterVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN3Pin 3AP — Plate (Anode)Verified

12L6GT/25L6GT manufacturer basing, 7AC

PIN4Pin 4AG2 — Screen GridVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN5Pin 5AG1 — Control GridVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN7Pin 7—H — HeaterVerified

12L6GT/25L6GT manufacturer basing, 7AC

PIN8Pin 8ABP — Beam-Forming PlateGroup AC8Verified

12L6GT/25L6GT manufacturer basing, 7AC

PIN8Pin 8AK — CathodeGroup AC8Verified

12L6GT/25L6GT manufacturer basing, 7AC

Section ratings

1 physical section, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
22500 Ω
Transconductance
0.0052 S
Max plate voltage
450 V
Max screen voltage
450 V
Max plate dissipation
30 W
Max screen dissipation
5 W
Max cathode current
220 mA

Promoted from published typical characteristics and limiting values in 7027A.pdf; repeated identical physical sections are compressed where applicable.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Heater voltage

    6.3 V

  • Heater current

    900 mA

  • Maximum plate voltage

    600 V

    ClassAB1;PushPull

  • Maximum screen voltage

    500 V

    ClassAB1;PushPull

  • Maximum screen input

    5 W

  • Maximum plate dissipation

    35 W

  • Push-pull plate voltage

    450 V

    ClassAB1;TwoTubes

  • Push-pull screen voltage

    350 V

    ClassAB1;TwoTubes

  • Push-pull power output

    50 W

    ClassAB1;TwoTubes

Characteristic

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    250 V

    ClassA

  • Grid voltage

    -14 V

    ClassA

  • Plate resistance

    22500 ohm

    ClassA

  • Transconductance

    6000 uS

    ClassA

  • Plate current

    72 mA

    ClassA

Capacitance

  • Grid-to-plate capacitance

    1.5 pF

Data set 02

2026 JJ Electronic

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Capacitance

  • Uf

    6.3 V

    Published value

  • If

    900 mA

    Published value

  • ca/g1

    1.5 pF

    Published value

  • Ua

    250

    Published value

  • Ug2

    250

    Published value

  • Ug1

    -14

    Published value

  • Ia

    72

    Published value

  • Ig2

    5

    Published value

  • N

    6.5

    Published value

Other

  • Ua

    450

    Published value

  • Ug2

    450

    Published value

  • Wa

    30

    Published value

Data set 03

2026 Tungsol Rebrand

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Power Output

    -

    HI-FI audio output; Class A/push-pull data published