At your risk.
The use of the somewhat big (size75mm) transformer with air gap and low ratio described on previous post makes possible a good quality sound with only a 12V battery.
But today a smaller size transformer made years ago rediscovered by chance produced a sweeter and better quality sound, more natural, easier and even smoother to the ear.
The size of this transformer is 60mm. Es are stacked together and there are 2 long screws keeping them together. While Is are stacked together and placed over the Es with no 3M Scotch invisible tape separating them. There is still of course a true air gap as metals do not fit exactly together.
Also thin wire is used by "mistake" on both primary and secondary.
Also and this is the most interesting point perhaps, the laminations are ordinary "thicker" laminations used on power transformers.
I thought there would be no extended high frequency response. By surprise there was amazing bass, mid and treble.
The experiment with this transformer sounds less loud but it sounds much better or listenable with musicality.
Signal path:
Constant Craving - K. D. Lang on CD - Sony CD Walkman line out - Pleiades 2N3055 resistor biased from collector to base, Vb=12V, Ic typically 60mA - Marantz Imperial 5-C with Tweeter setting at Low
Later addition:
Perhaps this comparison of the 2 transformers is not as relevant as it seems as the 2nd one has an inductance ratio of about 1.5H to 47mH i.e. is has a larger turns ratio.
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