almost finished aleph3

[cowanrg]

with the help of a few forum members (magura, mikeW, and alain), i am nearing completion on my aleph3. you can see specs and some other things in this thread: bringing up aleph 3, no smoke, but no sound

here are some pics from my horrible digital camera (takes worse pictures than some camera phones!)

(they arent huge pictures, but it still might take a few seconds to load)

view from front. its got a faceplate, but no light or on/off switch yet. still deciding what to do about all that.


a view of the back, i use the speaker posts on the far sides becuase these are monoblocks and i have short speaker cables. this helps me with better placement. it looks like the bolt of the xformer is touching the plate that the pcb is on, but its got about a 1/2" of clearance, its just the camera.


here is what it looks like all closed up. the case if from par-metal, and is really great. its cheap, and looks very nice. however, like all metal, it scratches easily, and is very difficult to work with when drilling, etc...


hopefully i can get it all wired up within the next few days and then start on the other one!

[Brian Donaldson]

Put a thermometer in the case and check, but my money is on the amp frying itself with that little ventalation and fins oriented the way they are. I don't mean to step on any toes, and it may be OK, but take precautions until your comfortable with final temp.

[cowanrg]

i have tested them face down, and they are fine. they get a bit hot, but not horribly so. 2 small fans might work out well though. but its already been tested.

[cowanrg]

also, its hard to tell from the pictures, but the top, sides and bottom are ventilated...

[kilowattski]

Just a word of warning. You may get some unwanted 60 Hz stuff because your amp board is awful close to the power transformer.

[cowanrg]

i hoped to counteract this by having the pcb mounted on a 1/4" metal plate. you can kinda see it in the picture. ive tested it like this, and its dead silent.

[trigon]

Originally posted by cowanrg
i hoped to counteract this by having the pcb mounted on a 1/4" metal plate. you can kinda see it in the picture. ive tested it like this, and its dead silent.

If you keep your signal ground away from the power supply ground you should be ok. Nice Aleph.


Trigon

[BDP]

Is the case a series 20? I'm looking for a case for the MOX X-over. How thick of front panel did you order and what type of finish, painted black or black anodized.

Thats going to make a nice package. How much bias on the outputs?

BDP

[cowanrg]

it is the series 20 case. its a bit thin, but its still metal, and strong enough for all the stuff in it. the front panel is the 0.25" thick panel. its decent, i wanted the thicker, but it wasnt in stock, and i got these for cheap. they are black anodized. i almost wish i would have gone with painted, because the anodizing scratches very easy, so its hard to get a PERFECT finished amp if you have any work that needs to be done on it.

i think the bias is normal, it pulls a bit over 2 amps. it gets HOT.

Originally posted by BDP
Is the case a series 20? I'm looking for a case for the MOX X-over. How thick of front panel did you order and what type of finish, painted black or black anodized.

Thats going to make a nice package. How much bias on the outputs?

BDP

[Magura]

When Working on painted/anodized ithems, just cover the ithem with adhesive plastic film for protection while machining. You can buy an easily removable version from the AD companies, they use it for window decoration.

Magura