Incredible quality amplifier by Graham, prepare your ears for it

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In this image, you can see parts over the board

This can give you an idea of the parts position

regards,

Carlos

 

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This image show the parts and their values

This is to turn easy the assemble and check up.

regards,

Carlos

 

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This amplifier, alike Radio frequency transmitters...need some tuning

And this is the real fun here.

You can produce many different amplifiers.... each one different, and this way you can customize it to your personal taste.

regards,

Carlos

 

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There are many modifications you can make

Here you can see some of them.

The ancient Aksas....used bootstrapped circuits too, and they have some identities...but Hugh discovered some modifications that made the amplifier unbeatable...and those are the secrets on Aksa.

Now, lifeforce is very different, but have their secrets too, and could produce a better sound, better bass, deeper bass, fast response, more clear voices and undistorted trebles....beeing better than old 55s

This Graham design works in class A, and produce that class A sonics you already know.

I am suggesting places were you can tweak.

regards,

Carlos

 

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This is the old schematic, produce by Graham Maynard

This one was used to produce the suggestion of lay out

No!... this layout was produce using paint.... is simple an not precise, of course, prefer to use something made with eagle or something alike.

regards,

Carlos

 

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A missed line included in the lay out

Sorry...my mistake.

regards,

Carlos

 

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Transistors position shown here.

regards,

Carlos

 

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This amplifier will not look ugly...it will be only very standard

It will look.....something alike this sketch.

regards,

Carlos

 

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There are two connections missed..for a while

Positive rails filter capacitors...left side filter....the ground side is not connected to the ground line that surrounds the board following counter clockwise direction.

Up rail driver colector is not connected to positive rail.

I will show, to the beginers only, how to produce simple boards, hand made.

First:

Prepare the board layout to be fixed over the board.

Carlos

 

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Fix your layout over the board...copper downwards.

The layout is positioned imagining that the board is transparent..and observing by higher position you are watching the components and the copper lines shown because you imaginate the board as transparent.

I hope not too much confused.

hehe

Carlos

 

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Now you are ready to produce the holes

That will be used to components leads.

regards,

Carlos

 

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Use the machine you have at hand...drilling machine or other

And open the needed holes.

regards,

Carlos

 

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Now you see the reference and the board side by side

Holes already done here...they are made, in advance, related to paint the copper lines.

regards,

Carlos

 

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Now turn your layout and turn also your board.

You will have the layout oposite side...seen using transparency...and the copper board with holes.

This is the reference used to trace, by hand, the copper lines.

You may use those permanent ink pens...those famous US pens used to write on glasses...or the one used for transparencies..or some pen you can find to be used to copper board, special to electronics.

regards,

Carlos

 

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Trace the copper lines following your transparent reference

Do this job manually.

regards,

Carlos

 

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Here is a sample of the work done..of course not perfect

As manual work normally is worst than the use of machinery.

regards,

Carlos

 

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Now let's corrode the copper...the non painted, exposed copper will be corroded

The "acid" used will corrode faster if you make it hot...around 60 degrées centigrades.

Here, i use Iron "Percloreto"...maybe chloride for you...or something alike.

When heated.... go twisting softly to create some "turbulence" that will produce better and faster results.

The copper goes up.

regards,

Carlos

 

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This is the board ready...the copper already removed.

The first step will be the used of steel brush to remove the paint.

The image is showing the copper side...with traces covered by paint...the hand work you have made.

regards,

Carlos

 

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Removed the paint...the copper lines will appear to you

Here is the image.

regards.

Carlos

 

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Here is the board...ready to be assembled.

Just following the sketch.

I will not assemble this month...maybe the other.... i have an enormous strip of amplifier under work.... a big line, now counting with 7 amplifiers.

My time is small those last monthes....amplifiers are beeing made very very slowly...alike a turtle...one each 15 days.

When normally i use to spend some hours to complete and listen

Of course..fast work is also a pig work...things turn ugly.

I hope i could help.

regards,

Carlos