Elliott P3A design based power amp:

hydrovac

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Hi all!

I have always wanted to build the Elliott P3A amplifier and long had it on my "want to build" list. Procured these modules without filter caps and heat sink...
The module has on board PSU and speaker protect... so, just need a mains filter, soft start and 40-0-40 @ 16amp trafo to power both the channels. Initially was contemplating to build mono blocks but, as i already have a large chassis with heat sinks... hence, decided to go for a stereo format.


The modules:
1721704959626.jpeg

Filter caps soldered and mounted on heat sink:
1721705576308.jpeg


The large and heavy enclosure i intend to use:
1721706179364.jpeg

1721706194520.jpeg



1721706217226.jpeg

...


 
Looks beautiful and Solid, hope it sounds good too.
What are the specs for this ?

Source for chassis ?
Thanks amrut,
Yet to gather technical specs from the designer...

(according to the designer} The design is a combination of P68 and P3A by Rod Elliott... the amp is capable of running in class A mode in low volume and automatically switches to class AB mode in high volume by self adjusting its biasing... it can run in fixed bias mode also, by soldering 2 diodes on the board to bypass the VBe multiplier section.

Trafo 40-0-40 @16amps, 0-12 @2amps for spkr protect powering both channels.
psu 2x15000uf/100vdc filter caps on each board... I was given an option of output transistors to choose from: 1941/5198, 5200/1943,
Njw 0281/0302
I opted for 5200/1943 (supposed to have more thermal stability due to its size)… three pairs per module.
300Watts @ 4ohm
180watts @ 8ohm load

clean execution.
Thanks Kannan!

Hook up wiring completed, powered and chkd rail voltages, dc offset (90 mV) and adjusted the quiescent current to 65 mA... will leave it on for couple of hours and recheck the values.

1721814288219.jpeg

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