GKDC 591B Hi-Fi rectifier, Equivalent to 274B 5U4G 5Z3, Superior to Shuguang GZ480 for Tube Amplifier (1 Piece)

591B Rectifier Tube
Product Overview
The 591B rectifier tube is designed as a high-performance upgrade for Hi‑Fi tube amplifiers. Built with premium materials and optimized acoustic structure, it delivers more current, longer service life, and smoother, more natural sound compared to conventional rectifier tubes.
Key Features

• Stronger Output Current

With a single‑sided anode and triple‑filament structure, the 591B provides up to 0.4A output current — 40% higher than the 274B rectifier tube. This brings fuller, richer sound and smoother high frequencies.

• No Arcing with Large Filter Capacitors

Unlike traditional tubes, the 591B supports a first‑stage filter capacitor up to 150μF without arcing, greatly improving stability and safety for your amplifier.

• Long Service Life

Made of high‑borosilicate glass that withstands rapid temperature changes. Designed for a service life of over 7,000 hours for long‑term reliable use.

• Optimized for Hi‑Fi Sound

The mesh plate design creates a more open and natural soundstage, improves sonic fullness and layering, and reduces harshness in the high frequencies for a cleaner, more musical listening experience.
Specifications

• Filament Voltage (Uf): 5V

• Filament Current (Ia): 3.1A

• Rectified Current (Iz): ≥380mA

• Maximum Output Current: 550mA

• Peak Inverse Voltage: 1500V

• Service Life: 7000+ hours

For delivery time:
Please contact us for checking the delivery time before placing your order.

Generally, we will dispatch the items within 7 days upon order confirmation; some items may need 20~25 days to get ready for delivery, then we will try our best to dispatch as soon as possible, or we will contact you and offer advice.

 
For Bulk order:
If you would like to place a bulk order, please contact us for better price and better delivery cost.