At your own risk always protect your hearing by listening at low levels.
Some relevant schematics may be:
If a vintage hearing aid has only 3 electron tubes, or 2 electron tubes and one transistor, or 3 transistors all operating in class A (electrons flowing all the time)...
Then how would such a top quality circuit sound by connecting say a Sennheiser MD21 with an input transformer or an MD21 HL using its internal transformer? Plates or anodes are at low 22V? potemtial so it may be a marvel of low noise amplification.
By connecting a suitable attenuator for protecting hearing, then Sennheiser HD580 studio quality headphones for example could be connected at the output.
How would it sound like?
Nice small boxes...
With a few stages of electron tube amplifiers...
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