These are actually 6H8C which is Russian 6SN7GT equivalent, and exported to the West back in the cold war years. Technically built to fulfill Russian Military standards, these are quality tubes and sonically superior to today’s current production! Our batches are from 1960's and 70's.
Quantity is Stock : 14 pcs
Price : Grade A @ US$29,00/ea ; US$60,00/matched pair
Grade B @ US$24,00/ea ; US$50,00/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.