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Electro Harmonix 5U4GB Is a great choice for the Mesa Boogie Dual Rectifier, Triple Rectifier amps that use the 5U4GB valves. Electro Harmonix are one of the few companies manufacturing the 5U4 rectifier valve making It another popular valve for the re-brand companies. Buy It In Its original form and markings at a fraction of the cost.Superior directly heated rectifier Diode. Replacement for all 5U4 types, including NOS-style "big bottle" tubes.
