Aleph Temperature Sweet Spot

[gnomus]

Any thing can have magnetic properties. If you have a powerfull enough magnet. I saw this on TV. A bug floated in a small highly concentrated magnetic field created in a small three inch cylindrical chamber. To create the field required the same amount of electrical power needed for a small town. You could do it to a person if you wanted to spend a few billion dollars to make a powerful enough magnetic field.

[Lisandro_P]

Originally posted by mrfeedback
Possible rational explanation is that temperature is affecting noise characteristics of output devices, combined with negative loop feedback system causing change in final output noise.

Wasn't the Lavardin amps about this ('constant power' biasing to have the transistors not changing their operating points)? It does make sense to me.

[macka]

Thankyou all for your technical and creative input.

Decision Time: Do I build a rectangle box or an Aleph cube?

Should I follow other or choose to be different or re create it in the mold of the original? How about we case a vote!

I have two options.

1. Build the Alpeh 2 in a rectangle (like the A60 and recent Aleph
2 project in the gallery) using available PCB's and two 35 x 15
x 5 cm heatsinks rated at 0.21 c/watt.

Given an ambient temperature in Melbourne of 19-22 c this will in theory give an operating temperature of about 50 to 53 c. Even in summer on a hot day at 30 c the temperature should still be about 60-63c.

The box is self would be the main contruction challenge.

2. Build the Alpeh in a cube (like the original) using (4) 20 - 25 x 15 x 5cm heatsinks each rated at 0.38 - 0.36 c/watt.

Based on the same conditions as above the operating temperature would be slightly lower in theory at about 46 - 49c and on a hot day still only 59 c.

The heatsinks could easily be bolted together with L angle aluminium and say a 3 inch deep plinth at the bottom to add some depth and form a base. The total size would be 25 x 25

But fitting everything in and assembling it and wiring it up could be a challenge.


Does anyone have any ideas?

All input is most welcome!


regards

macka