Vintage Tungsol 6550 usa tubes for sale

[bigdaddy]

4 Vintage Tungsol 6550 tubes for sale, a matched batch set made in USA, in 1974 , came out Marshall lead 100w amp.
Tested on a Hickok 533a tube tester, 3 tested like a new tube when tested for reduced life (reducing filiment voltage) 4th tube
Still passes life test, but has reduced emissions with lowered filiment voltage. Can split this quad set, pricing would vary on number of tubes and quality.

[bigdaddy]

Re: Vintage Tungsol 6550 usa tubes for sale

6550 is a sub for KT-88 with a bias adjustment. This change can give you better dynamic response, and a cleaner tighter sound