The 12v heater sister of well known Sylvania chrome top 6SN7GT's. These also have T-shape black plates. Our stock tubes are spare parts selected for test equipment manufactured by Sperry Gyroscope Company, US. The yellow stickers indicating the "selected part" have come off mostly.

Quantity in Stock : Out of Stock!
Price :  Grade A @ US$20,00/ea ; US$43,00/matched pair
           Grade B @ US$14,00/ea ; US$30,00/matched pair
           Grade C @ US$8,00/ea ; US$16,00/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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