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Re: a tale of two mono amps, one noisy and one good

"Rebiasing alone" will NOT allow you to substitute 6550s or KT88s for the 8417 tubes! QS modifies the circuit further - see the website for further info. You might try eBay for relatively inexpensive 8417s with the inherent attendant risk of poor quality tubes.


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  • Re: a tale of two mono amps, one noisy and one good - Webnick 09:51:24 01/07/07 (0)


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