4251594900887
article number: 5U4GB
product id: 43721
selected rectifier tube (RT504)
The Straight One!
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.
