What is the AZ1 vacuum tube?

The AZ1 is a rectifier vacuum tube designed for rectifier applications. Classic European rectifier. Gentle delivery..

What is a AZ1 substitute or equivalent?

Direct equivalents to the AZ1 include RGN1064. 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.

Is the AZ1 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the AZ1 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 AZ1 sound like?

Classic European rectifier. Gentle delivery.. 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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AZ1 Rectifier Vacuum Tube

Rectifier4V / 1.1ASide Contact P8A

SourcePhilips AZ1 datasheetReviewed2026-05-29StatusDataModelCalcModelunder reviewPDF

Full-wave rectifier for vacuum tube power supply designs

Datasheet ↗

AZ1 — Philips·Telefunken — rectifier vacuum tube — (1935)

5.0pF

6.5pF

4.00pF

GAIN0%

POWER0%

DRIVE50%

LINEARITY75%

SPECIFICATIONS

Heater4 V · 1.1 A

Max Plate Voltage500 V

Pa max—

Gain Factor—

gm—

rp—

Inter-electrode capacitances

Cgk5 pF

Cgp6.5 pF

Cpk4 pF

PinoutSide Contact P8A

Era1935

RarityModerate

HEATER4V / 1.1A

MAX PLATE500V

BASEp8a

Source datasheets

8 manufacturer datasheets cross-checked for AZ1

8 verified

EXECUTIVE SUMMARY

The AZ1 is a directly-heated rectifier from Philips·Telefunken, introduced around 1935. Commonly used in rectifier applications. Classic European rectifier. Gentle delivery.

APPLICATIONS

Power supply rectification

Generic rectifier rectifier stage

HISTORY

Introduced1935ManufacturerPhilips·Telefunken

Pre-War

AZ1 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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