NOS 1970's PHILIPS-ECG BRANDED TUNG-SOL 6550A / KT-88 matched QUAD MADE IN U.S.A.
PHILIPS ECG Tung-Sol 6550, plate with 3 holes version (PRECEDED by the plates without holes version).
Only Tung-Sol made ST shaped 6550, and sold to other manufacturers and merchants with a black plastic base under the metal, who rebranded (most common: RCA, GE, SERVICE-MASTER, AND PHILIPS ECG).
Appears to be very late 1970's production TUNG-SOL 6550 made just prior to TUNG-SOL closing down their Newark, NJ plant, they do have PHILIPS ECG branding on the quad.
NEW NEVER USED - GREAT TEST MEASUREMENTS
SUPERIOR METAL BASE POWER TUBES
THREE (3) GETTER RINGS FOR SUPERIOR PERFORMANCE
CLEAR, SOLID, LONG-LIFE POWER TUBES
LASTS 4 to 5 times longer than Russian or Chinese KT-88's
MATCHED QUAD:
TESTED AT FULL 500 VOLTS on the AMPLITREX AT-1000 TUBE TEST SYSTEM.
58.2mA (104%) 6,950 GM (107%)
58.1mA (104%) 6,900 GM (107%)
58.0mA (104%) 6,800 GM (106%)
58.0mA (104%) 6,800 GM (106%)
LIQUID midrange, SOLID bass, MADE IN USA, AMERICA’s BEST 6550A second to no USA made tube, superior to Svetlana or Sovtek 6550.
- ARC VT60, ARC VT100 MarkII and MarkIII, Ref. 300, Ref. 600
- Audio Research Reference 3 line-stage power supply
- Luxman
- Rogue
- Cary
- VTL MB300, MB450, ST-150
- CJ Premier 8 and 11A, 12
- Jadis
- Ampeg SVT
- Comins Alessandro Jazz Guitar Amp
- Cary SLI-80
- Octave V40SE
- THD
- VAC PA100/100
- McIntosh 275 MK IV 2005
- Harmon Kardon
- Audio Aero Capitole Integrated amp
