You're looking at two matched NOS pairs of VOSHOD ROCKET 6H23N tubes which is a variant of the E88CC tube family.Date of manufacture 1969 at the Voshod plant Russia.Ideal application for Audible Illusion pre amps which are notoriously hard on E88CC tubes or any other DAC/pre amp that requires this tube type.Technical particulars and consumer reviews on line.
Offered at $65 for the quad plus $5 for shipping.Personal check,US Post MO,cash,paypal add4% and I would invite you to check my audiogon feedback under my member name.
