All preamp tubes are being sold as matched pairs & have been tested for micro phonics.  In addition, the buyer may choose to have their tubes cryogenically treated, FREE of charge, as an added bonus. This is the same cryogenic treatment that we offer on our Kr Audio Tubes.

Please Note - These  preamp tubes  are being sold as matched pairs. These tubes come in their original British RAF military boxes & in their original cigar rolls.