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Right now on eBay
KT66  6L6GC  NEW   GROOVE TUBES  Matched Pair No Reserve
$192.31 HKD - 6 bids
KT66 Pair KT 66 two valves branded boxed Thermionic Superior Quality Audio Valve
$771.27 HKD
**Matched pair**Genalex KT66 amplifier tubes in original boxes.TV-7/U test NOS.
$1687.64 HKD - 5 bids
GEC KT66 vacuum tube matched pair NOS NIB
$3531.87 HKD
MULLARD KT-66 MATCHED PAIR NIB
Buy: $2017.32 HKD
SINGLE MARCONI KT66 Valve/Tube (NOS) Avo Tested 84/5.6 BOXED
Buy: $1388.29 HKD
KT66  6L6GC International Servicemaster W. Germany Telefunken ?
Buy: $1373.66 HKD
Marconi KT66 Valve - Selling on Continuity Only
$308.51 HKD
MATCHED PAIR MARCONI KT66 (Unused NOS) Tubes/VALVES Avo Tested BOTH 84/5.6
Buy: $3033.66 HKD
KT66 Genalex Matched and Cryoset Quad (4) - 6L6 5881
$1412.83 HKD
VT75 KT66 OSRAM Black Base New Old Stock Tube Valve 1 PC A
$2570.9 HKD
Marconi Osram KT66 CV321 Smoked Grey Glass Valve/Tube Used (V25)
$1336.87 HKD
MATCHED QUAD GE 7851A (6L6GC/KT66) Tubes  - Tests as NOS
Buy: $1739.01 HKD
GT-KT88 Matched Quad Groove Tube Quartet Medium Fender KT66 KT90 6L6
Buy: $1299.09 HKD
KT66 ORIGINAL MARSHALL SPARES MATCHED PAIR VALVE/TUBE
$462.76 HKD
Matched Quad Tube Amp Doctor TAD KT66-STR Genalex Tube Remake 6L6 QUAD II MC-240
$1169.57 HKD
CV1075 Mil Spec KT66 Vacuum Tube Valve Test good on AVO CT160
Buy: $1275.17 HKD
KT66 Haltron Made By Osram GEC New Old Stock Tube Valve 1 PC B
$2570.9 HKD
Osram KT66 Curved Brown Base Valve/Tube New Old Stock (V23)
$1645.38 HKD
Marconi Osram KT66 CV321 Smoked Grey Glass Valve/Tube (V25)
$1542.54 HKD
GOLDEN DRAGON KT66 Retro Amplifier Power Tubes SINGLE Valve /Matched PAIR / QUAD
$442.09 HKD
Matched Pair KT66  New Valve Tubes Gold Class Made By Shuguang China
$514.18 HKD
(10) old stock GE General Electric KT66 / 7581A 6L6GC
Buy: $7056.68 HKD
GOLDEN DRAGON KT66 Retro Amplifier Power Tubes SINGLE Valve /Matched PAIR / QUAD
$1645.27 HKD
GOLDEN DRAGON KT66 Retro Amplifier Power Tubes SINGLE Valve /Matched PAIR / QUAD
$822.59 HKD
2 NOS KT66 Audio Tubes / Made in Russia -- TX2
$470.58 HKD
  RARE TUBE -1) KT66 OSRAM --    VERY STRONG
Buy: $1553.07 HKD
KT66 Matched Quad Groove Tube Medium (4 Tubes) Fender KT 66 6L6G CV1075
Buy: $647.58 HKD
KT66 Matched Quad Groove Tube Low Fender KT 66 6L6G CV1075 EL37 PP60 VT75
Buy: $616.18 HKD
GE 7581 KT-66 6L6GB Tubes - Matched Pair, Tested
Buy: $627.96 HKD
GEC Osram KT66 CV1075 Shouldered Grey Glass Valve/Tube (V12)
$2570.9 HKD
KT66 Pinnacle Made By GEC New Old Stock Tube Valve 1 PC
$1768.78 HKD
OSRAM KT66 Shouldered Black Ladder Plate Pan Getter Valve/Tube (V12)
$2570.9 HKD
KT66 GEC # NOS/NIB # legendary tube # BOTTOM-OO-GETTER (10676)
$2205.45 HKD
EL35 Mullard  White Print KT66 6L6G  B New  Old Stock Valve Tube  1 pc MA18
$1768.78 HKD
Marconi Osram KT66 CV321 Smoked Grey Glass Valve/Tube (V14)
$1542.54 HKD
Four  Matched KT66 Valves - Premium Tested 120 Day Warranty
$1285.35 HKD
Brand New Tung-Sol Reissue 7581A KT66 Current Matched Octet (8) Vacuum Tubes
Buy: $1619.98 HKD
KT66 Haltron Made By Osram GEC New Old Stock Tube Valve 1 PC A
$2570.9 HKD
GEC Osram KT66 Shouldered Grey Glass Valve/Tube (V13)
$2570.9 HKD
Brand New Tung-Sol Reissue 7581A KT66 Current Matched Quad (4) Vacuum Tubes
Buy: $773.17 HKD
7581A KT66 GE MATCHED PAIR NOS VALVE/TUBE (LC19)
Buy: $1542.54 HKD
Brand New Tung-Sol Reissue KT66 Plate Current Matched Pair (2) Vacuum Tubes
Buy: $586.43 HKD
KT66 Brimar/GEC # NOS/NIB # BOTTOM-OO-GETTER # SMOKED GLASS - MILITARY (10514)
$2132.03 HKD
KT66 OSRAM  VALVE/TUBE Tests OK on an AVO MkIV Valve Tester
$1439.6 HKD
KT66 Quad Groove Tube High (4 Tubes) Fender KT 66 6L6G CV1075 EL37 PP60 VT75
Buy: $678.98 HKD
GEC Osram KT66 Black Base Smoked Glass Matched Pair Test Good
Buy: $6279.5 HKD
4x NEW JJ Tesla KT66 Vacuum Tubes, Matched Quad TESTED
$1149.95 HKD
JJ/Tesla KT66 Power Tubes, Matched Quad
Buy: $1260.55 HKD
KT66 GEC # NOS/NIB # legendary tube # military smoked-glass-version # (10649)
$2132.03 HKD
EL35 Mullard  White Print KT66 6L6G  C New  Old Stock Valve Tube  1 pc MA18
$1768.78 HKD
EL35 Mullard  White Print KT66 6L6G E New  Old Stock Valve Tube  1 pc MA18
$1768.78 HKD
KT66 OSRAM  VALVE/TUBE in Original Box Tests good on an AVO MkIV Valve Tester
$1536.88 HKD
EL35 Mullard  White Print KT66 6L6G  A  New  Old Stock Valve Tube  1 pc MA18
$1768.78 HKD
Brimar 6L6G Valve/Tube New Old Stock - 1 Piece (V20)
$514.18 HKD
Genalex KT66 6L6 1-Tube RARE *Teacup Getter*BROWN Base BLACK Bottle GEC Britain!
$1390.22 HKD
Brand New Tung-Sol Reissue KT66 Plate Current Matched Quad (4) Vacuum Tubes
Buy: $1106.78 HKD
TAD 6L6GC STR Cryo Treated Matched Power Tube Quad (4) 5881 KT66
Buy: $902.61 HKD
Brand New Tung-Sol Reissue 7581A KT66 Current Matched Pair (2) Vacuum Tubes
Buy: $411.08 HKD
EL35 Mullard  White Print KT66 6L6G D New  Old Stock Valve Tube  1 pc MA18
$1768.78 HKD
KT66 GEC # NOS # BOTTOM-OO-GETTER # SMOKED GLASS - MILITARY (10475)
$2132.03 HKD
KT66 Genalex Matched and Cryoset Pair (2) - 6L6 5881
Buy: $667.13 HKD
KT88 Quartet Slovakia Groove Tube Low (R1) (4 Tubes) Fender KT66 KT90 6L6 EL34
Buy: $1251.99 HKD
KT66 GEC # NOS # BOTTOM-OO-GETTER # legendary tube/oldest production (7335)
$2132.03 HKD
KT88 Quartet Slovakia Groove Tube Matched Quad Medium Fender KT66 KT90 6L6
Buy: $1299.09 HKD
Tung Sol KT66 Cryo Treated Matched Pair (2)
Buy: $549.38 HKD
PM GUITAR Amplifier Power Tube RANGE => SELECT model from Menu (Single & Matched
$1645.27 HKD
(2x) NEW KT66 JJ / Tesla Audio Output Tubes - VERIFIED MATCHED PAIR
$592.79 HKD
7581A GE USA  KT66   New Old Stock Valve Tube 1pc D17
$771.27 HKD
(4) Factory Matched Genalex Gold Lion KT66  6L6 6L6GC
$1326.56 HKD
EL35 Mullard  White Print KT66 6L6G G New  Old Stock Valve Tube  1 pc MA18
$1768.78 HKD
JJ/Tesla KT66 Power Vacuum Tubes Valves, Matched Pair
Buy: $640.6 HKD
EL35 Mullard  White Print KT66 6L6G H  New  Old Stock Valve Tube  1 pc MA18
$1768.78 HKD
PM GUITAR Amplifier Power Tube RANGE => SELECT model from Menu (Single & Matched
$822.59 HKD
RCA 6L6G (KT66 Equivalent) Valve / Vacuum Tube - AVO Tested - (#2)
Buy: $822.69 HKD
Brand New Tung-Sol Reissue KT66 Plate Current Matched Octet (8) Vacuum Tubes
Buy: $2118.97 HKD
EL35 Mullard  White Print KT66 6L6G F New  Old Stock Valve Tube  1 pc MA18
$1768.78 HKD
EL35 Mullard  White Print KT66 6L6G I  New  Old Stock Valve Tube  1 pc MA18
$1768.78 HKD
Matched Pair-NIB Philips (Sylvania) 7581A (KT66/6L6GC) amplifiers tubes.  NOS.
$784.87 HKD
Vendo Quartetto valvole Elettroniche KT 66 GEC NOS (possibile permuta)
Buy: $8270.8 HKD
Brimar 6L6G (KT66 Equivalent) Valve / Vacuum Tube - AVO Tested - (#12)
Buy: $822.69 HKD
Brand New Tung-Sol Reissue KT66 Plate Current Matched Sextet (6) Vacuum Tubes
Buy: $1671.0 HKD
KT88 Matched Sextet Slovakia Black Box Groove Tube Medium Fender KT66 KT90
Buy: $1927.05 HKD
Two Matched KT66 Valves - Premium Tested 120 Day Warranty
$750.6 HKD
Brand New Tung-Sol Reissue 7581A KT66 Current MatchedSextet (6) Vacuum Tubes
Buy: $1227.74 HKD
Tung Sol 7581A Matched + Cryo Treated Pair (2) 6L6 5881 KT66
Buy: $431.64 HKD
New Current Matched Pair (2) Reissue Genalex Gold Lion KT66 6L6 Vacuum Tubes
$525.52 HKD
Mullard EL35 Red Print KT66 6L6G Valve Tube (V16)
$1542.54 HKD
SINGLE Boxed MARCONI KT66 Valve/Tube (Believed NOS) 1 Avo Tested 70/5.1
Buy: $1388.29 HKD
PAIR  Rare BLACK BOTTLE OZRAM KT66 Valves/Tubes(BLACK BASES) 89/6.7 & 90/6.8
Buy: $5090.38 HKD
Genalex Gold Lion Tube Upgrade Kit Marshall Astoria Classic Amps w/KT66 ECC83
$1648.39 HKD
KT88 Matched Sextet Slovakia Groove Tube Low Fender KT66 KT90 6L6 EL34 6V6
Buy: $1879.95 HKD
TWO NOS SYLVANIA VINTAGE AMPLIFIER TUBES 5AR4 / GZ34 + 6L6GC / KT66 KNIGHT AUDIO
$2158.61 HKD
Sophia Electric 12AX7/ECC83 tube for 300B 2A3 El34 KT88 KT66 6550 tube amplifier
$784.95 HKD
6L6 WXT+ Sovtek Matched + Cryo Pair Vacuum Tubes KT66 5881
Buy: $353.15 HKD
KT88 Quartet Slovakia Black Box Groove Tube Medium (4 Tubes) Fender KT66 KT90
Buy: $1354.04 HKD
NEW - Single JJ Tesla KT66 Power Vacuum Tube valve
Buy: $310.76 HKD
5881/6L6WGB/KT66 GE # NOS/NIB  # Holy Grail  # BROWN BASE # (7372)
$596.42 HKD
ONE 1 x KT66  MARCONI OSRAM M-O Valve Company Tube OO Getter GEC G.E.C.
Buy: $1470.36 HKD
QUAD 4 x KT66 GENALEX GOLD MONARCH GEC G.E.C. Marconi UK Tube Match 2% OO Getter
Buy: $11027.73 HKD