Me too... me too.. pics of my DIY Aleph 30

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Andypairo

Andypairo

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Joined 2002
mio.discoremoto.virgilio.it/pirobrothers_netdisk/
#1
Just managed to take some photos of my in-progress Aleph 30.
Any comments/suggestions?

Unfortunately I haven't so much spare time so it is going on very slowly....:bawling:

Cheers

Andrea
 

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#5
Andypairo said:
Just managed to take some photos of my in-progress Aleph 30.
Any comments/suggestions?
Unfortunately I haven't so much spare time so it is going on very slowly....:bawling:
Cheers Andrea
Click to expand...
Will be a real Beauty! 🙂 🙂

That warm red/orange colored wood and those black heatsinks
go together perfectly matched in color.

When you are finished you should post your best pictures
to the Pass-Amp Gallery.

/halo - a colorful man fond of nice colors
 
#7
very nice! i hope it sounds as good as it looks.
did you do the pcb's yourself? i like the nice big tracks.
i quite like the transformer mounting, too.

very nice all round. i wish i could make stuff that good looking.

hope all goes well!:nod:
 
#8
Hamish said:
very nice! i hope it sounds as good as it looks.
did you do the pcb's yourself? i like the nice big tracks.
i quite like the transformer mounting, too.

very nice all round. i wish i could make stuff that good looking.
Click to expand...

I did PCBs by myself but using a layout given to me by a fellow Italian DIYer; the front end of most Alephs is identical, you only need different output stages (and of course different values of components..)

Cheers

Andrea
 
#10
You gotta be hot to be real cool...

Looks great! Be careful though that the transformer doesn't get to hot seeing you have both sides of it covered up. You can measure the temperature rise above ambient accurately by checking the primary winding resistance cold and then hot. Here's a spreadsheet to help you do this.
 

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#11
MikeW said:
I hope you have some more free time. It looks very nice. How about some details. Power supply? Caps? What kind of outputs and what bias? Good work.
Click to expand...


I hope that too...

I'm still deciding about the power supply: on the pictures tou can see a rectifier bridge (35 A) on each heatsink, so 2 bridges.
After that I have 2x22000 uF common to both channels, and after these 2x30000 uF (the capacitor arrays you can see on photos) per channel.
My doubt is about inserting chokes between the condensers since I have only 2 suitable air-core inductors (1,2 mH, 0,33 ohm) and the condensers that feed each channel would be in parallel.

Transformer is 2x 22Vac, 500VA; a bit high in voltage but these heatsinks allow me to reach a higher power, so I don't care.

Output devices are matched IRFP150, six per channel (3+3), bias is around 2,5 A.

I guess the only way to go is .. to try!!

Cheers

Andrea
 
#12
Re: You gotta be hot to be real cool...

Circlotron said:
Looks great! Be careful though that the transformer doesn't get to hot seeing you have both sides of it covered up. You can measure the temperature rise above ambient accurately by checking the primary winding resistance cold and then hot. Here's a spreadsheet to help you do this.
Click to expand...

Thank you, I'll check it out

Cheers


Andrea
 
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