On improving Better Skies - Papercut ?

https://m.youtube.com/watch?v=XTrUrB24Y_8


Very nice melody with prepared major 7ths (with respect to bass).
There is some kind of higher simplicity in this melody reminding good quality 80s.


An example on prepared major 7ths?
For example at 3:05 the vocal sings (....awayyyyyy...) with note E while bass is A and then bass becomes F while voice still on E creating a beautiful F major 7th interval lasting for a short time.


Shame on me, I did not know this song had been made in my country. I heard it possibkyngirstbtime yesterday on Galaxy radio.

Also nice prepared 9ths.
For example melody singing Mi Fa Sol Sol and bass becoming at the last Sol, from La to Fa creating Fa Sol ie major ninth.


Could it be improved?


Possibly by varispeed so that key becomes from A minor to B flat minor. Varispeed would create that ethereal quality to voice enhancing the nice vocal. Perhaps some selective echo too like on Moonlight Shadow - Oldfield.


Bass is also very nice.
Key is A minor ie all notes white or natural.
A9
F
D6
E

Efficiency vs sound quality is power amplifiers

Inconclusive as yet but some elements with examples can be seen in the next post on Pleiades BD139, Pleiades DL33, Pleiades 2N3055 one active device power amplifiers operating in class A (electrons flowing all the time).


It may be that less efficiency means more fidelity.


Nothing gets lost. One looses more energy but it may sound better.


Not much energy. One of these amplifiers consumes 200mA at 9V.
Yet it sends nice quality sound around many rooms.

Revisiting Pleiades DL33, Pleiades BD139 one active device amplifiers

This was done before listing to the Pleiades 2N3055


Signal path:


(Fame soundtrack CD, Ingenue - KD Lang CD) - Sony CD Walkman - amplifier under test - Zeis Ikon fullrnage baffle speaker or Pleiades linoleum Auratone 5C type fullrnage speaker - reverberant small room - listener's brain


Trying various output transformer secondary taps with the BD139 amolier it was found that louder did not mean better
More turn windings ie more output impedance gave a more smooth, bass, treble mid sound.
This agrees with the Nelson Pass paper on higher output impedance for driving fullrnage speakers.


The DL33 at 10mA sounded less loud but more civilized.


On both above cases the Zeiss Ikon speaker sounded much louder.


Then the 2N3055 was tried in a different room with tye Pleiades linoleum Auratone 5C type speaker, see next post.


Very nice sound.


It seems there is a lot of impedance mismatch as the 4Ω speaker voice coil is directly coupled to the collect.


Yet it sound nice and big.

Revisiting Pleiades 2N3055 one transistor amplifier (Part 3)

Caution: Always use a protective fuse in series with a battery


It still sounds nice.


Battery is discharged so that the voltage across it while the amplifier is operating is a bit less than 9 volts, in fact 8.9V.


Quiescent current trough transistor or loudspeaker at this condition is 200mA.


(Biasing resistor from collector to base is 10KΩ)


Signal path:


(Better Skies - Papercut) - YouTube - iPad mini headphones out, connection to one channel - 100μF 35V ELNA Silmic II capacitor - Pleiades 2N3055 in small aluminum box - Pleiades Auratone 5C type speaker placed on linoleum carpet above wooden floor - bedroom lab


The battery used is a discharged 1.2AH lead acid multipower.

Better Skies - Papercut ft Efi Theologou

https://m.youtube.com/watch?v=XTrUrB24Y_8


Very nice use of A9 ie:
La Do Mi Si


Also very nice use of 6th intervals above bass (ie 6th chords) just before 3:00


See also:


Bach Bass Rules - Bach, Niedt - PDF

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