(At your risk).
When connecting the Pleiades K117 to the Apple 3.5mm to USB C adaptor, headphones must be connected to the latter otherwise the mobile phone may not recognize it.
Friday, May 15, 2026
SM58 to mobile phone
(At your risk).
Please reduce volume before playing.
Signal path:
Outdoors at SNFCC park -
Shure SM58 at 24in, 45o above head towards nose of singer -
German Transformer 500 Ohm to 50 KOhm, primary inductance 230mH -
Pleiades K117 JFET microphone preamplifier (schematic on a previous post) -
Apple 3.5mm to USB C adaptor (with Philips in ear headphones connected to)
Xiaomi Redmi Note 13 Pro + 5G
Notes:
To my mind when I listen to it with the Sennheiser HD-580 headphones, it sounds bass or mid bass heavy. The Shure Unidyne B may do the trick as in my experience it can sound with flat frequency response from my mind as producer to my mind as listener without the need to add a frequency response EQ or filter after the microphone.
We need to use a much quieter outdoors place.
The Principle of Least Change in Music
(At your risk).
Least change has great impact on mind perception.
For example:
You Do Something to Me - Paul Weller
The song is written in E minor.
So the first bass is E.
Paul sings E #F G B while bass is E.
Then repeats B while bass goes down to D creating an interval of major 6th.
Then bass goes down to A but as there is nothing at that moment sung the mind of the listener has the perception of prepared major 9th since the distance between bass A and melody B is 9 steps of the scale.
For more please read the book: "A Letter to Clive Davis" - euroelectron
Further reading:
The Bach Manual for his students in composition which can be found at the appendix of Bach's biography by Spitta. I do not know if it is included in newer editions, please check.
The major 3rd major 7th Chord
For example.
Bass C (Do) and a higher part playing B (Si).
Accord to the Bach-Niedt manual we also add the 3rd with respect to bass, that is E (Mi).
The beauty can be heard whenever the singer sings "I can't" in every chorus of the song We Are the People - Empire of the Sun.
For more please read the book under construction: "A Letter to Clive Davis" on euroelectron.
Doris Day
I heard this yesterday form Kosmos FM radio of Hellenic Radio in the Adam's broadcast show.
The Kid and the Fish, a hypothetical fairytale
(At your risk).
The kid goes at the sea bank to buy fresh fish for the cat.
All fish are dead except 1 which jumps with agony inside an open white EPS box.
The fish cries please save me, buy me and set me free in the nearby sea.
He decides to buy 2 fish for the cat and him for 5e and then he asks the price for the alive fish.
OK 5e but please do not peel it and let me take it buy the time I leave.
The assistant of the seller puts the living fish just inside a supermarket strong plastic bag.
The boy rushes to the nearby beach at the back of the market place when he is alone with the fish in hand.
He throws the fish into the sea!
The fish is kind of dizzy. Almost does not not move.
A seagull immediately comes to get the fish.
The kid is ready to jump to save the fish or to get something form the beach to throw to the seagull.
The seagull gets frightened and leaves higher in the air.
The fish starts moving but there are a few dozens small fish gathered ready to eat it.
But as the fish starts turning towards them they get scared and kind of withdraw.
The fish find itself at very shallow water, almost eating mud..
But gets stringer and stronger and ...
Suddenly starts moving towards deeper water, leaving.
Salutes the kid...
The Sperm Donor, a hypothetical film
(At your risk).
The sperm donor after a few years happens to have in his class his child without knowing.
He feels somehow related and gradually falls in love with the mother of their child...
(Vicky pointed out that this idea can be an interesting contemporary film).
Great Inox (stainless steel) screws for Neutrik chassis connectors
(At your risk).
In Piraeus port near Athens there is a store with a huge warehouse selling great quality stainless steel products for marine etc.
This is what is used when building Pleiades amplifier prototypes.
A few days ago i had the pleasure meeting the sales manager Apostolos Tsochatzis.
They now sell worldwide through their www.inoxstores,com
Website is www.theodosiadis.gr
Tuesday, May 12, 2026
Phono Cartridges or Dynamic Microphones are nice...
At your risk.
They give you direct access to the ribbon or moving coil or stationary coil, that is the source of the music signal.
Then you can connect an external preamplifier and the better this preamp is made the more information or low noise you can extract.
And inherently their output is electronically balanced.
Tape recorder magnetic heads are the same but usually the preamps are built inside the equipment.
Whereas in a phono record player the output is direct access to the cartridge.
Thursday, May 7, 2026
DUAL CS-627 turntable battery powered?
At your risk. A suitable fuse must be in series with any battery for heat injury or fire hazard protection.
It looks a very promising candidate for being battery powered. All that seem to be needed is about 25V DC to power the electronics which control the DC motor which direct drives the turntable.
Power consumption with quartz unlock is just 3W, with quartz lock about 4.5W.
It comes with fabulous Ortofon low mass cantilever variable magnetic shunt cartridge.
Error in the Schematic of Pleiades 3 K117 JFET RIAA Phono Preamp
At your risk.
Current consumption is about 1.2mA per channel.
Tuesday, May 5, 2026
H. De F. Harold
The pioneer of the amplifier.
For example his patent US1349252, just an input transformer an electron tube, an output transformer and no resistors or capacitors, just 3 batteries for filament, bias, plate supply.
https://en.wikipedia.org/wiki/Harold_D._Arnold
Monday, May 4, 2026
Asian Spice Restaurant in 86 Liossion street Athens
At your risk.
I had yesterday one of the best meals i ever had.