Aleph Mini Pictures....Finally!

[highbias]

Here are a few pictures of the Mini that I built over last Christmas. Its been giving flawless performance since it was first turned on, driving a pair of Yamaha NS-10's.

Specs......

Tranny: Victoria Magnetics 320VA, 2X15 volt secondaries
Filtration: One Panasonic 120,000 mfd per rail
Outputs: IRFP-240
Wire: Silver plated Teflon covered 16 & 18 ga.
Board: Mike W. This board split in two
Resistors 1% mf RN65 surplus
Board Caps: Nothing fancy... but are 105 deg C.
Heatsinks: Surplus
Misc Parts: Surplus
Size: 14.75 W X 7 H X 6 D

P.S. Sorry for the less than adaquate shots as I am still trying to figure out this new D camera that I bought an hour ago.

Mark

Front view showing on-off Switch and blue LED.

[highbias]

Top view down into one end of the Mini. You can see the use of turrett terminals in much the same way that I previously used on the pair of 2's that I built. The power supply is built as a module that is inserted through the bottom of the amp. This will make disassembly and servicing in the future very easy.

Mark

[highbias]

Bottom view where you can see how the power supply module which is built onto the plate in the center is attached to the front and rear panels. The heat sinks are also attached to the front and rear making this a very strong chassis. The other advantage is that the entire amp acts as one huge heatsink.

Mark

[highbias]

The rear panel. The cheapo jacks will remain till its anodized and otherwise complete....some day...... Then replaced with higher quality stuff.

Mark

[highbias]

Another bottom view from one end showing routing of wore from board to heatsink. The general layout for the power supply module can also be discerned from this view.

Am building an Aleph 30 in a similar way for a friend. The difference is that it will be two heat sinks long each side and which will be spaced a bit further apart. This will allow more chassis length for larger the power supply components and chokes.

Mark

[MikeW]

Very nice mini. How much bias are you running? How hot does it get?

[cowanrg]

congratulations! i know how good it feels to be nearing completion.

do you have any pictures that would show scale? its heard to tell how big/small it is.

[highbias]

With an ambient room temp of 24.6 drg. C The running temp is 48 deg C on the top center of the heat sink. Never measured the actual current draw really accurately, just did it with a DC amprobe but have since forgotten what it was. The drop across the source resistors is about .52 volts. Weight is about 28 lbs. Photo attached for size comparison.

Mark

[kilowattski]

Wow! I am very impressed. Excellent build quality. I can see you have done this before. Do you plan on anodizing the chassis?

[highbias]

Thanks for all the compliments... I definately plan on anodizing it. The black pieces will actually get black hard coat instead of just a regular anodize because its far more durable than plain anodize and the fade rate is much lower. Front panel will be pewter and the rest black. I am planning on having the Mini, my pair of Aleph 2's and the Aleph 3 all done at the same time to get the overall cost per unit down. It'll be a good project for this winter and then on to a couple of no holds barred Aleph Ps. I plan on machining those chassis from a solid block of 6061 alumnium. The power supply for the P will be a thermo electric power generator.....(just kidding)..... I know you have the only Flux Capicators that were available!


Mark