Log-in

(!!!) (#1 - U52=5U4G - Best Pair - Best Sound) U52=5U4G GEC brown base "D" getter NOS 1950's original boxes (54/40 - 55/40 and 54/40 - 55/40) 1% matched (P3)

$ 798.88

1 matched pair) U52=5U4G GEC black plates - brown base "D" getter NOS 1950's original boxes

same date codes "LM" tubes were factory sealed in plastic, cut open to test and match

1 tube) 54/40 and 55/40

1 tube) 54/40 and 55/40

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

TUBE #1) 

Diode #1 Forward Voltage 417V, Reverse 27V drop

Diode #2 Forward Voltage 418V, Reverse 28V drop

TUBE #2) diagonal scratch on glass

Diode #1 Forward Voltage 417V, Reverse 27V drop

Diode #2 Forward Voltage 418V, Reverse 27V drop

each tube has M.W.T = (Marconi Wireless Telegraph) on each tube

each tube has "Aduana perfumeria circulacion" stamp on glass (Spain - customs label)

U52 are best sounding 5U4G ever made

only tube that compares to U52 sonically is the 274A or 274B Western Electric 

 

Recommended for

- SET amps

- Wright Sound SET
- Audio Note P4 Balanced mono amps
- Dared MCP7 preamp with phono
- Singlepower
- Modwright Transporter
- Donald North Audio

 

 

 

 

 

 

See more: vacuum tube
Scroll to top