1. Less is more.
2. The frequency responce curve must be flat not from mic to loudspeaker but from vocal chords of singer or actor to the brain of the listener.
3. Doubling of frequency is not a correct octave to the brain of the listener. For example 880Hz sounds a flat A5 (the mind perceived octave of 440Hz is not 880Hz, why should it be?) S. S. Stevens.
A nice example of correct intonation for human brain is Days of Future Passed - Moody Blues
4. Softly playing or singing creates a loud end recorded result. (How to make a mix loud etc - Sound on Sound)
5. Pitch perception does not depend only on frequency but on intensity too. Example, a loud 440Hz tone sounds flatter than a soft one. (Sound and Hearing - S. S. Stevens)
6. Electron tubes can amazingly operate with just one 3V battery. (Pleiades V series)
7. Input transformers can also be easily hand made. (Pleiades transformers, filters)
Additional notes:
What we eat, (drink, breath, think etc) or rather not eat is more important than the greatest preamplifier power supply.
The first light rays on our body (sunrise) seem to be very important. Frequency is high and the energy of a photon is proportional to frequency). They enter our body and it is said they repair everything. No need to overdo anything. Παν μέτρον Άριστον. The frequency is a few hundred THz (terra hertz or million million hertz).
Dry rubbing with hands our body in the morning under the sun to get rid of so many dead cells in the form of dust plays a significant role in our well being. Fresh and clean air, brushing teeth with top quality and expensive ultra soft tooth brush, toothpaste without flue ride fluoride. Eating magical sesame. Using common sense...
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