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Futterman H3 Blowing Fuse

I am restoring a Futterman H3 stereo amp (Harvard Elec). This one uses 6EJ7, 6FS5, 6DR7, 6EM7 if that helps. It is blowing fuse after a minute or two. I believe the output tubes (6HJ5) are weak and can not source 8 good ones. If I fire it up without the 6HJ5, it does not blow the fuse. Not sure if I should source 6HJ5 or convert to a different tube.
Is there an easy tube conversion to replace the 6HJ5? Was thinging of EL509. May not be as easy to convert as 6LF6, but avilable.
Any help is appreciated. The guys at moscode may charge a pretty penny to get it all running with conversion. I would be willing to pay reasonable repair/conversion cost, but who knows when they say "Send it in first".
I plan to use it with stacked Quad 57.


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Topic - Futterman H3 Blowing Fuse - vacumtubes 22:15:06 09/25/06 (6)

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