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  « old tungsol 6550 U.S made 1960's-1970 strong quad »
March 29th, 2024, 2:44pm
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   old tungsol 6550 U.S made 1960's-1970 strong quad
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   Author  Topic: old tungsol 6550 U.S made 1960's-1970 strong quad  
wilsonzxj

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old tungsol 6550 U.S made 1960's-1970 strong quad
« on: July 13th, 2017, 10:18pm »

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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%20tun gsol%206550%20US%20made%20vintage%20strong%20quad?sort=3&page=1

T ung-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/sms/watsapps/email--91454638-wilson/ wilsonzxjtube@gmail.com (overseas and local registered postage services are available)
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