classic 60 tubes

Tubes Asylum

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I own a Arc classic 60 which I enjoy very much,but it is time for new tubes. Presently it has kt91s. Is this the best tube for the amp or should I go for something else like 6550, which I think are the original type. Also,I am under the impression that some mods had to be done to use the kt91s and that some changes would have to be made to go back.
thanks for any information...Kelly

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Topic - classic 60 tubes - kms 20:20:14 03/28/06 (2)

Re: classic 60 tubes - The Lost Bears 05:28:57 03/30/06 (1)

Re: classic 60 tubes - kms 21:16:46 04/01/06 (0)

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