5U4GB made in Russia

Description

5U4GB Russian-made rectifier listing

This product retains the Russian-made 5U4GB designation recorded in the Glass Audio catalogue. The original manufacturing factory, production date and individual measurements have not been established here. Ask us about the markings and available item if your purchase requires a particular manufacturer or production variant.

Historical 5U4GB type reference

The RCA reference describes a full-wave vacuum rectifier with a directly heated coated filament. Its November 1954 tentative data gives a 5 V AC, 3 A filament and an octal base, with basing diagram G-5T shown from below.

• Peak inverse plate voltage: 1,550 V in the cited historical reference.
• Peak plate current: 1 A per plate; this is not a continuous DC load-current rating.
• Permissible AC supply and DC output: consult the rating chart for the filter and operating conditions.

These are historical RCA type data, not a Russian manufacturer specification or measurements of the individual valve offered. Filter capacitance, transformer impedance, load, switching conditions and mounting requirements must be assessed together. A value from a capacitor-input example must not be treated as a universal DC output or approved capacitor value.

Replacing a rectifier safely

A 5 V filament or octal base alone does not make a valve an approved substitute. Do not assume interchangeability with 5AR4/GZ34, 5Y3, other 5U4 suffixes or a solid-state rectifier. Filament demand, voltage drop, supply behaviour, equipment ratings and startup conditions can differ. Rectification by itself does not guarantee voltage regulation, reduced hum or a particular audio character.

Glass Audio tests valves before sale. No selected noise grade, service-life guarantee or unused-stock condition is claimed here. Power supplies can retain lethal voltages after disconnection; a suitably qualified technician should assess compatibility and internal servicing.

Reference and ordering support

Source: RCA 5U4GB historical archive, including tentative data dated 5 November 1954 and separately dated charts. Follow the exact document conditions rather than combining limits from different revisions.

Visit the datasheet library or contact Glass Audio with your amplifier model and existing rectifier markings. International postage is calculated before a quote. Pretoria collection is by prior arrangement.