Description

audiophile crown jewel! the top sonic echelon mullard xf is one of the most rugged 6ca7 el34 ever made highly sought after liquid mid-band, musical polished tonality, great lows w/ refined bass, and an oustanding top-end rich warm immersive depth, and full frequency holographic sound reproduction ~ truly collectible, upgrade fidelity! 3 x authentic gt britain mullard, w/ fair visible silkscreens, and plain or branded boxes included, etch codes below + complimentary value-added refurb screen and deox process, one of a kind quality control full mutual conductance gm test, set of 3 strong old stock: xf2 b9j2 etch ~ 90 % gm / xf2 b6c2 etch ~ 105 % gm / ~ xf4 b6f3 etch ~ 105% gm (65 good) our high power output test simulates circuits, and applies up to 250v, more than many other testers + important life test pass! (longetivity indicator) + an impeccable gas / leak / short check give 150+ session hours w/ your specific amps voltage to fully cure / break-in ships well packed worldwide w/ free economy postage! authentic vintage hifidelity audiophile / preamp / power / mic tube curation by caliacoustics see our website for new arrivals + limited special editions + rare true-nos sealed box + pinched waist collectibles