Up for sale is a NOS Matched Pair of OLD (Pre-War) EI 12AX7 ECC83 Tubes. I purchased these as a spare set for my Fisher 500c Phono stage. I tested them for 5-10 minutes and Put them away as spares. They are VERY Quiet. There is no stenciling on the tubes. The Tubes have the Philips-EI etched Factory Codes. Tube 1 was tested at 110/110. Tube 2 was tested at 112/112. If you have ANY problem I will refund you and pay the return shipping. There is a 30 day return. Domestic Boxed shipping is FREE. If you make additional purchases, I will combine the shipping.

Thank you,

amadeus