U52 Osram 5U4G brown base Square getter Blue cobalt logo km4 code Z tested 100% pair

Description

The U52 aka 5U4G is one of the best selling valve here at Audio Magical.

We had many requests about this valve and its variation.

We thought it is our commitment to show all that is available for this directly heated full wave rectifier that saw the light in the 1940s.

With a rating of 500 Volts on the anode, the U52 remains the best option for any vintage and modern set.

Please browse through all we have.

Pair of  unusual Osram U52 blue cobalt logo, hard to find a pair these days. square getter and black plate.

Osram U52 Blue Cobalt logo tested with AVO VCM 163 with A1=A2 100% emission