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(!!!!) (#1 U52 Pair) U52=5U4G GEC brown base "D" getter NOS 1950's original boxes (54-58/40 and 54-59/40 x 2 tubes) (P1) (Best 274B SUB)

$ 808.88

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 58/40

1 tube) 54/40 and 59/40

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

TUBE #1)

Diode #1 Forward Voltage 419V, Reverse 23V drop

Diode #2 Forward Voltage 420V, Reverse 28V drop

TUBE #2)

Diode #1 Forward Voltage 417V, Reverse 23V drop

Diode #2 Forward Voltage 418V, Reverse 28V 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
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