U52=5U4G GEC brown base "D" getter NOS 1950's (sold out)

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Sorry, this product is sold out!

sold out) U52=5U4G GEC black plates - brown base "D" getter halo NOS 1950's original box date code "LM" - tube was factory sealed in plastic, cut open to test 

1 section) 54/40 

1 section) 58/40

Amplitrex Tested: 120ma current through plates (below 42ma V drop is very good)

Diode #1 Forward Voltage 412V, Reverse 24V drop

Diode #2 Forward Voltage 412V, Reverse 28V drop


U52 are best sounding 5U4G ever made

the only 5U4G substitute that sonically compares to the U52 is the 274A or 274B Western Electric 


Recommended for

- WA6-SE (Special Edition) Headphone Amplifier

- SET amps

- Wright Sound SET

- Audio Note P4 Balanced mono amps

- Dared MCP7 preamp with phono

- Singlepower

- Modwright Transporter

- Donald North Audio






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