Aleph 30 going on..

Andypairo · 26th February 2003, 05:35 PM

I am currently idle-testing my amp with no load and no signal attached.

Power supply comes from a 2x22 Vac transformer (500 VA), primary capacitors (20 mF per rail), then a R-C for each channel (and rail) (165 mOhm - 30 mF).

Both rails are at about 30V dc, which is quite high for a Aleph 30 but since my heatsinks are big enough I don't care.

After a hour the thermistor I use for inrush protection settled at about 72 °C, while the heatsinks are slightly different but at least 20 degrees below.

I noticed that the "signal" mosfets get quite hot: is a small heatsink mandatory or they can be avoided?

for now.. that's all folks!

Cheers

Andrea

Mad_K · 26th February 2003, 08:34 PM

Quote:

Originally posted by Andypairo
least 20 degrees below.

I noticed that the "signal" mosfets get quite hot: is a small heatsink mandatory or they can be avoided?
!

If you run normal bias (5V acoss R11) on them, they can be avoided. (I don't use them).

Andypairo · 4th April 2003, 12:00 PM

Here are some photos of this little monster.. upper and back plate are made of sanded aluminium, the light from the pushbutton is actually blue (even if it doesn't seem...)

Andypairo · 4th April 2003, 12:02 PM

Next one

Andypairo · 4th April 2003, 12:03 PM

another.. closeup of the rear panel

Andypairo · 4th April 2003, 12:04 PM

inside view..

Andypairo · 4th April 2003, 12:05 PM

a photo was supposed to be in the previous message...

Andypairo · 4th April 2003, 12:07 PM

pant..puff... the last one!

moe29 · 4th April 2003, 02:39 PM

Phat!

nice case work

way to represent...

keep keepin' it real

m., out

relder · 26th April 2003, 01:20 AM

How did you cut the slots in the top/back?

26th February 2003, 05:35 PM	#1
Andypairo diyAudio Member Join Date: Sep 2002 Location: near Milano , Italy	Aleph 30 going on.. I am currently idle-testing my amp with no load and no signal attached. Power supply comes from a 2x22 Vac transformer (500 VA), primary capacitors (20 mF per rail), then a R-C for each channel (and rail) (165 mOhm - 30 mF). Both rails are at about 30V dc, which is quite high for a Aleph 30 but since my heatsinks are big enough I don't care. After a hour the thermistor I use for inrush protection settled at about 72 °C, while the heatsinks are slightly different but at least 20 degrees below. I noticed that the "signal" mosfets get quite hot: is a small heatsink mandatory or they can be avoided? for now.. that's all folks! Cheers Andrea

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4th April 2003, 12:04 PM	#6
Andypairo diyAudio Member Join Date: Sep 2002 Location: near Milano , Italy	inside view..

4th April 2003, 02:39 PM	#9
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	Phat! nice case work way to represent... keep keepin' it real m., out

26th April 2003, 01:20 AM	#10
relder diyAudio Member Join Date: Jan 2002 Location: Tucson, AZ Blog Entries: 14	How did you cut the slots in the top/back?

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