Alpha Nirvana 39w 8ohm Class A Amp

[Nikos]

Find a large graph millimeter paper . Since first you have the dimensions of the materials. Boards ,trafo, psu caps and these heights .

 

[andyr]

I plan to use a 600W switching power supply in the same case, not a linear power supply.

What makes you feel an SMPS will be a good PS for the AN? Compared to, say, the 'SLB' which was designed specifically for it?

 

[Yurid]

@andyr I just have smps already and it worked great with JLH amp. Also SLB boards are not available for order now.

 

[jacques antoine]

@andyr My AN is equiped with modded SMPS and it works perfect.

 

[Yurid]

@jacques antoine Looks great! What SMPS did you use?

 

[jacques antoine]

@Yurid I used two MEANWELL LRS-350-24 (trimmed to 27V). I replaced the noisy Meanwell fans with silent Noctua NF-A9 FLX 92mm.

 

[Yurid]

@jacques antoine Considering that you have two separate power supplies for the positive arm and the negative arm, did you use any protection? I mean, what will happen if one of the power supplies fails?

 

[jacques antoine]

@Yurid There is a uPC1237-based delay and DC protect board visible between the two SMPS.
I use the same in all my amps and it effectively protected my speakers from single rail failure in another build.

 

[Yurid]

@jacques antoine By the way, Mean Well has low-noise 27-volt SMPS from the RPS line.

 

[jacques antoine]

@Yurid The RPS-300 are not good for this purpose: they only supply 200W with passive cooling. Unless of course you use four of them 🙂

 

[andyr]

@andyr My AN is ecquiped with modded SMPS and it works perfect.

I can well understand that, yes, it "works" - ie. makes a sound.

But for "perfect" ... I suggest you need to do a direct comparison with an SLB-equipped AN. 🙂

 

[andyr]

Also SLB boards are not available for order now.

Aah, OK. If you can get hold of the circuit ... you can always use 3mm teflon sheet as the "board" - and make up your own.

 

[Yurid]

@andyr My JLH1969 was originally built with a linear power supply, but I later changed it to an SMPS and it still sounds great.

 

[Yurid]

Aah, OK. If you can get hold of the circuit ... you can always use 3mm teflon sheet as the "board" - and make up your own.

Good joke.😁

 

[andyr]

@andyr My JLH1969 was originally built with a linear power supply, but I later changed it to an SMPS and it still sounds great.

That's a good test! 👍

 

[andyr]

Good joke.😁

Why is it a 'joke'? The teflon sheet holds the components in place ... and you do point-to-point soldering on the other side. Being teflon ... the sheet doesn't melt. Works very well.

Here's a dual 24v PS I built for my Naim 12s (heavily modified!) preamp:

 

[jimk04]

I have an M2X on SMPS and it sounds great, granted no comparisons yet to a good old fashioned set up, but I doubt it would be a vast amount better. Maybe if using say Tombos R21/R25 regulators then maybe so. But it's all conjecture isn't it without A/B tests.
Suffice to say I was very pleasantly surprised how good an SMPS can sound. And also not all SMPS are born equal!

 

[Yurid]

@andyr Great job! But for me this approach is too labor intensive.

 

[Yurid]

I have an M2X on SMPS and it sounds great, granted no comparisons yet to a good old fashioned set up, but I doubt it would be a vast amount better. Maybe if using say Tombos R21/R25 regulators then maybe so. But it's all conjecture isn't it without A/B tests.
Suffice to say I was very pleasantly surprised how good an SMPS can sound. And also not all SMPS are born equal!

I believe that a good high quality SMPS can easily compete with a linear power supply.

 

[Yurid]

@jimk04 I plan to use a custom high quality smps for this amp. Well, let's see what happens.