Best Sounding E188CC=7308 are these
(7308=10,000 hour premium 6922 with low microphonics)
7308 Amperex Holland "PQ" white printing with 2 Stars on tube 1959 - 1960
7308 Philips Miniwatt Holland 1958-1966 <--IN STOCK (the first series had 2 stars on each tube)
7308 Telefunken 1960's
7308 Siemens 1960's (some are branded RCA West Germany)
7308 Mullard 1960's - 1970's, many have dimpled disc getter halo
7308 Amperex PQ USA white printing 1960-1967
7308 Amperex PQ USA orange printing 1967 - mid 1970's
7308 Amperex JAN and USN-CEP-7308 Amperex white label 1960's
7308 Sylvania JAN NOS late 1960's to mid - 1970's
7308 Siemens late 1970's-1980's (avoid these, poor sound)
The Best Sounding 6922=E88CC Gold Pins ever made are:
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6922 Siemens Halske early to mid 1960's (airy highs, great detail, solid bass)
6922 Telefunken 1960's
6922 Amperex "PQ" Holland Gold Pins white printing 1960-1966 (older the better)
6922 Amperex Holland branded Amperex or Philips Miniwatt or Mullard Holland
or Philips Holland "SQ" 1960's
6922 Mullard 1960's
CV2493=E88CC-01 Mullard late 1960's to mid-1970's
6922 Amperex USA "PQ" white printing 1960's then orange printing 1967-1972
Best Sounding CCa Low Noise 6922 Gold Pins are:
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CCa Siemens late 1950's (extremely rare)
CCa Siemens mid-1960's (slightly better than the Tele, slightly more high-end air)
CCa Telefunken 1960's (superb overall sound, very rare)
CCa Siemens 1974
The Best Sounding 6DJ8=ECC88 ever made are:
6DJ8 Siemens West Germany 1960's (nothing beats this tube; accurate, open, focused, detailed, airy, tight bass)
6DJ8 Amperex Bugle Boy Holland "D" getter 1950's (superbly musical 6DJ8, nice articulate bass, 3D sound)
6DJ8 Telefunken West Germany 1960's (a little bass shy, but superbly smooth and listenable long term)
6DJ8 Amperex Bugle Boy Holland 1960's
6DJ8 Amperex Holland 1960's and Amperex Holland Globe Logo late 1960's - mid 1970's
(some are branded Philips Miniwatt)
CV5358=6DJ8 Mullard 1960's (smooth, good bass, the older versions are the best)
6DJ8 Mullard 1960's (either branded Mullard or Philips or Amperex Great Britain)
6DJ8 Sylvania late 1960's - mid 1970's (excellent sound for the money, best value)
6DJ8 GE USA 1960's - 1970's
