2 NOS Mullard Mitcham CV455 R7J Code 1967 ECC81 12AT7 Gt Brit Audio + FreePost

Audiophile crown jewels, revered worldwide for their rich holographic sound stage imaging. Set of 2 vintage grey plate mullard mitcham cv455 (special 12at7 ecc81) audio / preamp vacuum tubes.

Pristine matched pair w/ authentic. Etch codes and mullard boxes, old 1967 production. Carefully curated screened and twice tested, plus complimentary proprietary refurb deox process.

(65) + important life test pass! (life check = longetivity indicator). Our special gm output test applies real world 225vdc voltages w/ filtered dc, plus an impeccable gas test and leak/short check. Mutual gm conductance scores are the ability to transfer current especially important for push-pull preamps. Also double checked (twice tested) for mutual gm conductance via supplier tv7 / hickok 539c.

Give 100+ session hours w/ your specific amps voltage to fully settle in (break-in is important). Authentic vintage hifidelity audiophile / preamp / mic tube curation by caliacoustics. Including limited special editions + rare true-nos sealed box + pinched waist.

Also high-resolution headphones + premium vocal stage and studio mics. 6dj8 7dj8 6922 7308 / ecc88 pcc88 e88cc e188cc cca.

12ax7 12at7 12au7 12bh7 / ecc83 ecc82 ecc81 e82cc. 6bq5 6au6 6267 6ca7 6ca4 6aq5 / 6v6 6l6 6sl7 6sn7 5y3 5u4 5ar4. 5814 5751 5965 6189 6201 7062 7189 / cv2492 cv4004 cv455 cv4085. El34 el84 ef86 ef94 ez81 ecc85 e180cc gz34.