Tube Amp Doctor 5U4GB Rectifier Tube

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Special offer ends January 16, 2026 at 4:00PM ET

StewMAX Member Appreciation Event
20% OFF + FREE SHIPPING*
Special offer ends January 16, 2026 at 4:00PM ET

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Single Tube Item # 50279 No longer available
$20.70
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Tube Amp Doctor 5U4GB Rectifier Tube

The 5U4GB has a straight glass envelope. This type has been widely used in U.S. made guitar amps from the 1950s to the 70s.

The 5U4GB has a slow start feature, which protects output tubes from high voltage peaks when you switch the power on.
California Proposition 65 Warning
Cancer and Reproductive Harm
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