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5U4GB Electro-Harmonix

5U4GB Electro-Harmonix

R 480.00 ZAR
R 480.00 ZAR
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The Electro-Harmonix 5U4GB (model 5U4GBEH) is a direct-heated dual-diode octal-base power rectifier vacuum tube designed to replicate classic vintage U.S.-made RCA black-plate 5U4GB tubes. [1, 2, 3, 4]
Key Specifications & Features
Type: Octal-base full-wave power rectifier (filamentary twin diode) [1, 2]
Filament Requirements: 5.0V DC/AC at 3.0A (3000 mA) [1, 2]
DC Output Ratings: Typically delivers 275–300 mA DC output current at roughly 290–420V DC (capacitor input). [1]
Maximum Ratings: Peak inverse plate voltage of 1550V and steady-state peak plate current of 1.0A. [1]
Tone & Characteristics: Provides a warm, clean, and sweet tone with classic tube "sag"—offering a softer, more compressed dynamic feel compared to a GZ34/5AR4, but with more headroom than a 5Y3. [1, 2]
Compatibility: Can substitute into any circuit calling for 5U4, 5U4GB, 5U4GA, 5U4G, or GZ37. (Note: Exchanging a GZ34/5AR4 for a 5U4GB requires verifying power transformer and filament current (3A draw) ratings to avoid damage). [1, 2, 3]

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Product Product subtotal Quantity Price Product subtotal
5U4GB Electro-Harmonix
5U4GB Electro-Harmonix
5U4GB Electro-Harmonix
R 480.00/ea		 R 0.00
R 480.00/ea R 0.00