top sonic echelon vintage rft germany ecc813, classic warm tone audio tube, telefunken alternative and similar to 6463 + more below
this hard to find nickel grid coin base was a limited run '60s audiophile darling, briefly mentioned in literature 1962-1964
tune-up and tweak your systems measured feedback, holographics, transparency, distortion, and sound stage warmth
(also see similar: 6463 E86CC CV5305 CV5304 CC86E 6GM8 ECC86)
full mutual conductance gm test + life/leak/short/gas/sound check, several pristine singles w/ nice silkscreens in stock
+ undergoes a value-added complimentary refurbish and deoxit process ~ one of a kind seller quality control
give several sessions or up to 100+ hours w/ your specific amps voltage to cure / break-in
ships well packed worldwide!
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