Rectifier · Full-wave rectifier
5U4GB
Directly heated full-wave rectifier used in many vintage-style amplifier power supplies.
Base: Octal
- Specs not yet verified against a datasheet
- No replacement verified yet
Where to buy 5U4GB
- ReverbNo affiliate relationshipSearch 5U4GB on ReverbOpens reverb.com search results
Online marketplace for new and used music gear, including vacuum tubes.
- Apos Audio isn't listed: its site search didn't return a 5U4GB when we checked on Nov 4, 2026.
Each button opens that retailer's own search for 5U4GB. We don't see their prices or stock.
Before you buy, check that the listing names 5U4GB. A listing that mentions another tube name isn't necessarily the same type. Affiliate disclosure
Specifications
Not yet verified
Electrical specifications are pending verification against a manufacturer datasheet. We don't publish numbers until they have a cited source.
Common uses
- power supply rectification
Replacing a 5U4GB
A tube that fits the same socket is not automatically a safe replacement. Heater voltage, pin connections and electrical ratings must match what your amplifier is designed for. Check your amp's manual or a qualified technician.