> What tools

If you want to characterize the transformers properly you probably need
two complete network analyzers and some auxiliary DC and AC sources to
simulate ground loop, external magnetic fields, DC components in some of
the windings, etc.

If you are satisfied to go 'by ear', get a pair of good ready made
transformers a reel of cable and a switchover device (to switch to your
transformers and to the good ones), and start testing with your friends.
The comparison with the factory made units will remove some of the
siubjectivity in the tests.

Of course you know that overdriving transformers with certain core
materials (soft saturation) is one of the old ways to get a good guitar
fuzz ;-). In fact the core material is extremely important for good sound.

You could also cheat and get two miniature 600 Ohm bal/unbal transformers
for use in audio equipment and build a small preamp to drive them in the
guitar (impedance transformer with a little gain, like 3-5dB). These will
transformers cost $10+ each.

Peter

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