Aleph-X: High-Power Version

[dantwomey]

Grataku,

Let's take this discussion in a new direction. Whether it be the Aleph 1.2, or the XA200, or a 200W Aleph-X. Would the 'gain' justify the 'pain'?

Regards,
Dan

[roddyama]

Originally posted by dantwomey
An extra ten hours this week will buy me a 1500VA plitron. A few more hours over christmas and I can buy a heatsink. etc. etc. etc.

Regards,
Dan

Hi Dan,

You might think about a few more hours into January and February because for a 200w Aleph X your going to need 2 of those 1500VA Plitrons (one for each channel). Even that would be marginal if you wanted to make the Aleph1.2 mark of 300w into 4ohms.

Here's Williams post which includes his spreadsheet for calculating power dissipation in the Aleph X
http://www.diyaudio.com/forums/showt...066#post101066

[dantwomey]

I believe I have enough spare parts to complete the power supply and heatsinks for a single 'test' channel. If I could talk a couple people local to me like Peter and Coulomb into some sort of joint effort I think we would have some interesting pics by March.

How's that for a little optimistic stab at the outer limits?

Regards,
Dan

[Coulomb]

Well the 1500VA Plitron is $191 CAD, I have two at 60 VAC for my Aelphs. I guess I will need two more at 22 VAC secondaries and 8 Amps of bias to get 160 watts into 8 ohms. The thing is my speakers are 6 ohm loads, which will give me 225 watts TOP.

I think I will just leave them outside this winter, that should keep the snow back 20 or 30 feet from the house!

Anthony

[roddyama]

Originally posted by Coulomb
I think I will just leave them outside this winter, that should keep the snow back 20 or 30 feet from the house!

Anthony

If you have force air heating, just put them in front of the return vent and save on the gas bill.
Just don't stick then under the thermostat, it might get a little chilly in your house.

[Coulomb]

Here is the chassis I am working on for my High Power Aelph X, I have two of them. I hope to have the metalwork finished in January.



Anthony

[roddyama]

Oh yeah, Now I remember those cases from the first time you linked to them a while back. They should do the job quite well.

[dantwomey]

Coulomb,

Where did you source those heatsinks?

Regards,
Dan

[Coulomb]

eBay, $8 US each. I bought 16 of them.

eBay rules for sourcing Heatsinks and Capacitors.

Anthony

[Coulomb]

Originally posted by roddyama
Oh yeah, Now I remember those cases from the first time you linked to them a while back. They should do the job quite well.

Yeah they were going to be for an Aelph 1.2 but the Aelph-X seems more worthy. I have had some troubles with a place to host my pics so my links keep changing, Most annoying.

The cases are not finished, I have to do something with the corners. There will be a Hardwood trim on the bottom on the front and sides with the I/O on the lower back.

Right now I have Dales boards set up to give me two FETs per heatsink - 16 in total. With the spreadsheet I grabbed from this forum it looks like I want 8 Amps at 27 VDC rails.

Regards

Anthony