JLH1969 Class A amplifier build

[ashar]

In this thread i ll be posting about my diy jlh1969.
Suggestions are always welcome.

After looking online for boards the only option in current situation was a pcb from diyaudiocart and components from projectpoint and diyaudiocart.
Here are some initial pics of progress so far.

 

[VSTEREO]

Looking forward for your build. JLH is my fav.

 

[sadik]

In this thread i ll be posting about my diy jlh1969.
Suggestions are always welcome.

After looking online for boards the only option in current situation was a pcb from diyaudiocart and components from projectpoint and diyaudiocart.
Here are some initial pics of progress so far.

I dont see any pics.

 

[ashar]

I tried uploading the pictures. But i need to compress them and upload. Will do in a while

 

[ashar]

Both boards were soldered.
All components are correct and initial test were done on a regulated power supply each channel drawing about 1.2 amps.
I m yet to make a power supply for these amp which is gonna be 18v with 32000uf capacitance x 2
I have used a spare motorcycle head for the heat sink .as i did not have any proper heatsink for now. This seems to be working just fine.
The amp sounds v v beautiful on the philips hi q speakers.
Next is making psu, enclosure, add VU meters and a preamp.

I think preamp is v imp for jlh power amp to make it louder .

Any suggestions and comments are most welcome.
Pardon my mistakes in this project is my first completely home built .

 

[ashar]

More pictures.

 

[ashar]

Trials on one board
No humm at all and the bass is v prominent

 

[ashar]

Board mounted on the big heat sink might look funny but it gets the job done.

 

[ashar]

Perspective view

 

[amrutmhatre90]

Interesting way for using Heatsink, looking forward to this build.

 

[ashar]

I sacrificed one transistor to confirm originality and quality.
They are 2n3055 from CDIL

 

[keith_correa]

Love the "jugaad" for the heatsinks!!!

 

[VSTEREO]

Very interesting to see motorcycle head as heatsink. That's DIY!

 

[jls001]

I don't care if it sounds good or bad. The cylinder head is too cool

 

[surfatwork]

Cool heatsink

 

[IndianEars]

Perspective view

I LOVE the Heatsink !

I remember in college, when we built the JLH, we often put each 2N3055, without heatsinks, in a saucer of water where the Top cap was submerged but the terminals dry... Needed periodic top up of the water.

Of course, each 2N3055 in a separate saucer, since their collectors (cases) are at significantly different voltages.

 

[keith_correa]

I LOVE the Heatsink !

I remember in college, when we built the JLH, we often put each 2N3055, without heatsinks, in a saucer of water where the Top cap was submerged but the terminals dry... Needed periodic top up of the water.

Of course, each 2N3055 in a separate saucer, since their collectors (cases) are at significantly different voltages.

So that's what they meant by "liquid cooled"!!!

 

[IndianEars]

I sacrificed one transistor to confirm originality and quality.
They are 2n3055 from CDIL

How does one confirm originality & quality by looking at the chip inside ?

 

[ashar]

How does one confirm originality & quality by looking at the chip inside ?

Tye fakes ones have no alluminium base under the chip , the chip is directly pasted on the body.

 

[ashar]

Trial on both boards together. The head is really serving the purpose really happy with the sink , will also add fans to induce more cooling.
Currently using 3way speakers.
The correct speakers would be full range speaker, that i already have will post vidos with them soon