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Re: My Fisher 500B just blew up.

Even with the new JJ and EH tubes and the McShane mods, expect some "incidents."

In the past 2 years I've purchased 3 matched quads of JJ 7591's for different amps and 2 matched quads of EH 7868's...all from different reputable suppliers which are all AA sponsors. In all of my amps I reduced the grid leak resistors to 160k. With two of the matched JJ sets, one tube in each set went "south"....one after 9 months, the other after a month of use...the third (newest) set is fine for now after 3 months. The EH 7868's have faired better for me in my statistically insignificant sampling....all of the tubes have been fine (although one tube started out noisy and settled down in use).

In the future I may buy a matched sextet to have a spare or two...


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  • Re: My Fisher 500B just blew up. - dadbar 08:21:20 04/26/07 (0)


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