old tungsol 6550 U.S made 1960's-1970's vintage strong quad tubes, guitar, hifi, preamp, speaker, amplifer, cd player, dac, turntable, headphone, audiophile
old tungsol 6550 U.S made 1960's-1970's vintage strong quad tubes, guitar, hifi, preamp, speaker, amplifer, cd player, dac, turntable, headphone, audiophile
old tungsol 6550 U.S made 1960's-1970's vintage strong quad tubes, guitar, hifi, preamp, speaker, amplifer, cd player, dac, turntable, headphone, audiophile
old tungsol 6550 U.S made 1960's-1970's vintage strong quad tubes, guitar, hifi, preamp, speaker, amplifer, cd player, dac, turntable, headphone, audiophile
old tungsol 6550 U.S made 1960's-1970's vintage strong quad tubes, guitar, hifi, preamp, speaker, amplifer, cd player, dac, turntable, headphone, audiophile
old tungsol 6550 U.S made 1960's-1970's vintage strong quad tubes, guitar, hifi, preamp, speaker, amplifer, cd player, dac, turntable, headphone, audiophile

old tungsol 6550 U.S made 1960's-1970's vintage strong quad tubes, guitar, hifi, preamp, speaker, amplifer, cd player, dac, turntable, headphone, audiophile


S$700
Singapore

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old tungsol 6550 U.S made 1960's-1970's vintage strong quad--$700 test results--66,65,64,65 From the condition of the tube and mercury they are either new old stock or very very lightly used http://s1076.photobucket.com/user/llczxjlpolsy/library/old%20tungsol%206550%20US%20made%20vintage%20strong%20quad?sort=3&page=1 Tung-Sol 6550 from the late 1960's to very early 1970's. All these tubes have similar production codes on the base. They are the 3-getter, 3-hole version. tubes are tested on tv-7 tube tester use by U.S army and airforce where minimum good for 6550 is 44. strong/nos start around 60/60 and above interest call--91454638-wilson/ wilsonzxjtube@gmail.com overseas and local registered postage services are available.


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