SYLVANIA 12AU7 Long Black Plates 1950's

SYLVANIA JAN CHS & JHS 12AU7 Long Black Plates 1950's
Military spec tube from early and mid 1950's. Their constructions are black plate with square getter halo. These are sought after for their smooth and detailed sound. Matched pairs available.

Quantity : Low Stock! 
Price : Grade A @ US$26,00/ea ; US$54,00/matched pair
          Grade B @ US$20,00/ea ; US$44,00/matched pair
          Grade C @ US$10,00/ea ; US$22,00/matched pair

Grade A - The best in the stock. Lowest noise and microphony with the tightest balanced sections we have available. This is typically 10% or often tighter given the large volumes of our stock.
Grade B - Low noise and microphonics with a section balance typically between 15% and 20%, but may be higher depending on available stock.
Grade C - Lowest noise but slightly microphonic. Section balance will be similar to Grade A or B. This grade is only suitable for use in the driver stage of an amplifier, or the output/buffer stage of a DAC or CD Player.

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