Pics of Aleph 5

[protos]

Here are the pictures at last of my Aleph 5 monos. Although not as pro looking as some constructions I've seen at Pass diy and here I am quite proud of them considering a complete lack of electronic diy experience. Many thanks to all for their help. Thanks Mr.Pass for sharing. Without this very informative and encouraging site I would never have attempted this.

[protos]

pic 2

[protos]

pic 3

I took about 45 hours to finish. Although I did need some extra hours to trouble shoot some silly mistakes.

[Tony D.]

Nice Alephs. Did you add another pair of output devices per channel?

The Aleph 5 boards I have seen only have spaces for 6 IRFP044 or such per channel.

Tony D.

[Peter Daniel]

What is between heatsinks and the angles where you mount devices? Looks like another piece of something.
Nice use of a single board for everything.

[Nelson Pass]

Smart as paint, sez I.

[mefinnis]

You certainly haven't skimped on the heatsinking

How warm are the amps and did you run standard bias, or was the extra FET for some additional oomph ?

Well done, Mark

[PedroPO]

nice job

it's really nice!

I'm doing one miself (wainting for the sinks). I hope mine gets half as good as yours.


did you use a external PSU?

Post it on Passdiy (maybe some better quality pics).

[Edwin Dorre]

Originally posted by protos
Here are the pictures at last of my Aleph 5 monos. Although not as pro looking as some constructions I've seen at Pass diy and here I am quite proud of them considering a complete lack of electronic diy experience. Many thanks to all for their help. Thanks Mr.Pass for sharing. Without this very informative and encouraging site I would never have attempted this.

Nice to see another Aleph finshed! Nice going! Love the feet!

Perhaps you can up the bias a bit with so much heatsink! Are those perpetual P1 and P3 DAC's in your rack? How do they sound with the Aleph? What loudspeakers are you using?

I always like the look of a blue led in grey front!

Edwin

[protos]

Thanks for the nice comments guys.
Here is some extra info. The ps is under the main board and is 500va trafo 2 bridges 2x47000uf Aerovox caps (no bypass).OFC cabling and Audio Note silver coated input wiring and input output connectors.Black Gate electrolytics. Brass screws for the fets.The values for bias are kept as per original x3 plan only I have x4 so I guess I do have more oomph probably around 2.1/2.2 amps bias per side. Heat sinks are running at about 45C although the fets measure much higher if you measure directly on center pin so I would hesitate to bias them even higher.Does anyone know what the maximum temperature is for these fets under reasonable conditions? The amps are very quiet even without extra ps filters. I have to put my ear practically right up to my 90 db Zingali Overture 3 horn/hybrid speakers to hear any noise. However I do seem to have some noise when connecting the input but I guess that is a system grounding problem.
Credit is due to Kostas Vazakas who is featured in the Pass diy gallery and who was so kind as to send me his pcb design seeing that I have no clue how to design a proper pcb. Unfortunately his measurements did not fit with my transformer width so I ended up using those two extra strips of aluminium between the angled extrusion and the heat sink . I still am not completely satisfied with the look of the aluminium. It scratches easily and when I tried to polish it with a polisher and cream it doesn't polish evenly.I tried to experiment with brushing but that doesn;t have an even look to it either.
I am using the perpetual P1-P3+ power supply with a Teac VRDS 25(clocked) as transport (regarded as one of the best transport mechanisms- I think Wadia use them). I will be upgrading the op-amps to BB opa627 within the next couple of days. I am very satisfied with this combination and I think it is a bargain for the price.