What can I built with 1:1 audio transformers?

[GrooveChampion]

Bought some 42TM018's for an amp selector I never needed building, now they are lying around, suggestions on what to use them on?

[anders]

Maestro Brassmaster!

[GrooveChampion]

Wait really? I thought octave fuzzes use other transformers

[PMowdes]

Death by audio - Space ring

http://guitar-fx-layouts.42897.x6.nabble.com/Death-by-Audio-Space-Ring-Verified-tp42130.html

[balazs.bencs]

Earthquaker Devices Bit Commander! Octave goodness will blow the roof off.

[SpaceCommandant]

Would it be possible to use a 600ohm :600ohm transformer in some of these? Maybe by modding some values?

[GrooveChampion]

Mine is 10k to 10k I think