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http://cie-wc.edu/Series_Parallel_9_14.pdf
Not recommended.
you could add 3 more 8 ohm speakers in series / parallel wiring and keep an 8 ohm load to the amp, or
2x 4 ohm speakers in series, or
2x 16 ohm speakers in parallel
the fuse hopefully took the brunt of the higher voltage,, replacing the fuse should do the trick, but yes you need the voltage transformer for sure they sell them pretty cheap here, Just be sure and look for the wattage in each one
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Probably the bias is set wrong... Please note that when installing MATCHED pair tubes, the tube pairs usually go at opposite ends of the strings, that is one on either side of the center of a set of four.
Make sure that when the audio from the speaker cuts, the headphones are still working (try it several times). If this is correct the problem isn't at the preamp or driver tubes. Try to locate the wire that is connecting the speaker with the amplifier. There must be a bad connection at this cable or at the speaker's coil itself. Try hiting with a solid tool (the back of a screwdriver for example) the parts and the connections (not the tubes, just the mountings) while the amplifier is working in order to locate a loosing contact. Once you find it use a soldering gun to fix the connection.
In case of a problem or clarification, don't hesitate to post.
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