All pre-amp tubes are being sold as mathed 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 pre-amp tubes are being sold as single matched pairs.  These tubes come in their original British RAF military boxes & in their original cigar rolls.