Joe Dassin

 

A Pleiades derivative of the great Musical Fidelity A1 class A amplifier

 At your risk.

How would it sound if only the last 2 transistors are used with an output transformer say 2:1 and no negative feedback?

For example single ended with BD135 driving the 2N3055,  and Vb=24V.

Euroelectron playlist on YouTube

At your risk.

https://www.youtube.com/playlist?list=PLpEisBQ5la76mpSBX1IuTnT6iD1ywZCq6

Abrazame - Julio Iglesias

Acapulco Nights - G.J. Lunghi

Annabel - Xarhakos

Bad Boy - Den Harrow

Big in Japan - Alphaville

Cenerentola - Martinelli

Crazy - Patsy Cline

Interlude - Siouxsie, Morrisey

Maria Magdalena - Sandra

Miserere - Alegri, Roy Goodman, SIr Willcocks

Tha s' Agapo - Galani

The Captain of Her Heart - Double

The Hook - Hatzinassios

The Fate of Ophelia - Taylor Swift

The Power of Love - Frankie Goes to Hollywood

Year of the Cat - Al Stewart

My Army of Lovers - Army of Lovers

musicalike playlist name on YouTube has been changed to euroelectron playlist

 At your risk.

On renewablemusic YouTube Channel.

https://www.youtube.com/@renewablemusic

Pleiades BD650 one Darlington transistor power amplifier in single ended Class A

 At your risk. A suitable fuse must be in series with any battery for safety. Protect your ears from high SPL. There is a broadband click sound when turning off the amplifier.

It sounds very nice. Drums sound like the real thing.

Singal path: 

On the Border - Al Stewart (on origianl CD) - Sony CD Walkman line out - Marantz Imperial 5G (one speaker so far)

Power supply is just 12V from a 1.3AH lead acid battery. 

Ic is 120mA. So power output should be less than 1W.

Output hand wound transformer is about 3 to 1. So from an 8 ohm speaker the amp sees about 

8 ohms x 3 x 3= 72 ohms. Air gap is by gluing one layer of scitch invisible tape across the stacked Es.

The transformer used on this prototype is rather big.

Bias is by a resitor from collector to base.

There is a 50uF film wound input capacitor.

And a variable series resistor (rheostat)  connected to base for volume control.

It should be nice making 2 such monoblocks inside a transparent plexiglass box powered by 8 AA batteries in series with a suitable fuse.

Everything is Beautiful, Όλα Είναι Όμορφα

At your risk. Με δική σας ευθύνη.

Γυρνώντας από σπίτια

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Έχοντας περάσει θαυμάσια

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Με τισ μουριές να θυμίζουν 

Απο τη γλύκα που γεύτικες

Που σου έδωσε απλόχερα κάτι που στερήθηκες μικρός

Και νέος μένεις όμορφος

Με απίστευτο ταχίνι ολικής

Κακαό 100% και χουρμάδες βασιλικούς

Δίπλα σου στο μετρό

Κάθεται μια κυρία όμορφη

Με μιά μανώλια στα δύο χέρια

Που μυρίζει αρχή καλοκαιριού

musicalike playlist on renewablemusic - youtube

At your risk.

https://www.youtube.com/playlist?list=PLpEisBQ5la76mpSBX1IuTnT6iD1ywZCq6

Acapulco Nights - G.J. Lunghi

Annabel - Xarhakos

Bad Boy - Den Harrow

Big in Japan - Alphaville

Cenerentola - Martinelli

Crazy - Patsy Cline

Interlude - Siouxsie, Morrisey

Maria Magdalena - Sandra

Tha s' Agapo - Galani

The Captain of Her Heart - Double

The Hook - Hatzinassios

The Fate of Ophelia - Taylor Swift

The Power of Love - Frankie Goes to Hollywood

Year of the Cat - Al Stewart

My Army of Lovers - Army of Lovers