80A

Type 80/274A-compatible directly heated full-wave rectifier for conventional high-voltage power supplies. Its five-volt filament provides moderate current for amplifier, receiver, and other vacuum-tube supplies.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: UX4
Socket code: UX4
Base pins: 4
Nominal heater: 5 V / 2 A

Description

Special Type 80/274A-compatible directly heated full-wave rectifier. The supplied Emission Labs sheet was read for filament data, maximum ratings, representative operating points, gm/rp/mu, output conditions, capacitances, and rectifier filter conditions as applicable.

Socket description

Medium-shell UX 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: UX4
Socket code: UX4
Base pins: 4
Nominal heater voltage: 5 V
Nominal heater current: 2 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

UX4 - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier nominal output current: 160 mA

Representative of two electrically identical rectifier paths.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier nominal output current: 160 mA

Second physical rectifier section; promoted electrical properties populated from identical section.

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

2026 Emission Labs

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristics

Filament voltage
5 V
Filament current
2 A

Other

Maximum AC input voltage
350 V RMS
Type80;CapacitorInputFilter
Maximum DC output current
125 mA
Type80;CapacitorInputFilter
Maximum AC input voltage
550 V RMS
274A;ChokeInputFilter
Maximum DC output current
160 mA
274A
Maximum first capacitor
4 uF
274A