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Quad 6550


Brand New Matched Quad (4) Genalex Gold Lion Reissue KT88 / 6550 Vacuum Tubes

$173.06


KT90 EH Matched Cryo Treated Quad (4) 6550 KT88

$189.99


New Current Matched Quad (4) Psvane KT88 (6550) HiFi Series Vacuum Tubes Hi-Fi

$124.95


NOS MATCHED QUAD Tung Sol Style 6550 Tube Shuguang Beijing Made 80's KT88

$64.99


New JJ Electronic OEM KT88 Tubes Valves, Matched Quad KT-88 6550 KT 88

$99.99


Matched Quads (4 tubes) Tung Sol 6550 Reissue amp tubes, BRAND NEW

$118.10


Electro Harmonix Factory Plat Matched 6550 6550EH Vacuum Tubes QUAD 24hr Burn-in

$119.95


SOVTEK Factory Platinum Matched QUAD FOUR 6550WE 6550 tubes 24 Hr Burn-in

$112.95


KT88 Matched Quad Electro Harmonix + Cryo Treated Vacuum Tubes- 4 6550 KT90

$169.99


Brand New Current Matched Quad (4) Electro-Harmonix 6550 Ceramic Vacuum Tubes

$124.98


Tung Sol KT120 Cryo Matched Quad (4) - 6550 / KT88

$199.99


Tung Sol 6550 Cryo Matched Quad (4) - KT88

$179.99


Factory Matched Quad Tube Amp Doctor TAD KT88 6550 For Tube Amplifiers Citation

$199.00


NOS PHILIPS ECG JAN USA 6550 AMPLITREX TUBES MATCHED QUAD!

$798.00


Quad of Tung-Sol (GE label) 6550 KT88 NOS NIB Solid Gray Plate 1961 Vacuum Tubes

$1,100.00


Matched Quad (4) original Svetlana SED 6550C, AT1000 Tested, mid-1990s

$294.00


QUAD of General Electric GE 6550A tubes ~ test NOS...OUTSTANDING!

$610.00


Tung-Sol 6550 Original Issue Tubes, Matched Quad - Tested, NOS

$650.00


MATCHED QUAD - SVETLANA 6550 / 6550C (KT88) VACUUM TUBES - CURRENT MATCHED!

$124.50


Factory Matched Quad Tube Amp Doctor TAD 6550 6550A KT88 - GE 6550A Remake

$180.00


Tung Sol KT150 Cryo Matched Quad (4) KT88 6550 KT90 KT120

$389.99


Brand New Current Matched Quad Svetlana 6550 / 6550C (KT88) Reissue Vacuum Tubes

$129.50


New Plate Current Matched Quad (4) Tung-Sol Reissue 6550 KT88 Coke Bottle Tubes

$128.00


TAD Matched Quad Winged C SED 6550 C Tubes-24 Hour Burn In -Premium Selected NOS

$490.00


Factory Matched QUAD Svetlana KT88SV 6550 KT88 - For Tube Amplifiers

$160.00


New Premium Select NessTone 6550 Power Tube Matched Quad - Big, Clean Warm Bass

$89.99


Mullard KT88 Cryo Treated and Matched Quad - (4) 6550 KT90

$179.99


Quad of Telefunken Black Diamond 6550

$284.00


KT88(6550)Cryogenic Valve Art tubes matched pair 2 pcs. quads available.

$89.90


KT88 JJ Cryo Treated Matched Quad (4) 6550 KT90

$189.99


Matched Quads Svetlana 6550 6550C amp tubes, BRAND NEW

$125.00