several Aleph's in one big case

[aaronboumans]

I am building a new 8-channel amp. 4 aleph 60's and 4 alep30's in one big case
It is an extention from my stereo-system to 5.1 (all active).
My question is;
As all 8 unbalaced inputs are connected to one active filter, so sharing the signalground, should I connect all powersupply ground (from all 8 Aleph's) to eachother? All 8 amps are in one case, should I consider it to be one amp or as 8 amps in one case? What's the best internal wiring? All seperate or all together?

 

[aaronboumans]

with picture
so maybe will react faster😱
notice the cd for size reference


see build here;
http://www.zelfbouwaudio.nl/forum/viewtopic.php?f=7&t=11329

 

[Zen Mod]

....should I connect all powersupply ground (from all 8 Aleph's) to eachother?...

let each stereo PSU have it's gnd connected to chassis via 10-20R NTC

that , with proper layout of power buses and input cables , will give you hum free operation.

hopefully

 

[moe29]

wow, that's a lot of heat to dissipate in one case...

my Aleph 2 mono blocks look about as big, when put side by side 🙂

good luck finishing it up!

 

[aaronboumans]

zen mod; so all eight grounds seperately with 8 NTC's to chassis.
Can you explain why? thanks
@moe29
I will measure the heatsink for proper comparison

 

[Zen Mod]

you said :

As all 8 unbalaced inputs are connected to one active filter, so sharing the signalground

so - fact is that each PSU must be connected to safety gnd , same as case ;

if you connect those PSUs ( read - PSU grounds) ditto to safety gnd , you'll have gnd loop between inputs and PSU side gnds

when you connect those PSU gnds via 10-20R NTCs , that resistance is usually enough to avoid gnd loops

read Pass papers - there you'll find pretty clear and often humorous explanation for all important audio things

 

[aaronboumans]

like this?
http://www.dz3w.com/uploadfile/2010/0815/20100815101057521.gif
in the right lower corner, the thermistor?
From circuit and chassis ground to the NTC to the AC outlet ground.

 

[Zen Mod]

sort of , but not exactly

look in F5 pdf , for instance

there are two NTC's - one in-line with mains (as soft start) , and another one between gnd and chasiis , which is directly on safety gnd

 

[aaronboumans]

and I should do this will amps in the one case. All 8 gnd throught 8 ntcs to chassis/acgnd
Ok
thanks Zen Mod

 

[aaronboumans]

I measured the heatsink;
its 96x50x33 cm(24,4x19,7x13 inch)

 

[aaronboumans]

done! finished!
see featured build on
Pass DIY

 

[6L6]

My God, that must get hot!!!!

But it looks great!

 

[aaronboumans]

when the total system is finished there will be 8 aleph60 and 8 aleph30 (and a 1500W AB sub-amp) working at once. That it why the lack of socks 😛

global warming? sorry my fault....

 

[Loudthud]

What are you using for a power transformer(s)? What does it draw from the power grid?

 

[wirewiggler]

to quote Chocky "anyone can dim there own lights, real diyers dim their neighbors" or something like that.

Bill

 

[aaronboumans]

What are you using for a power transformer(s)? What does it draw from the power grid?

all toroids.
Typical A60 draws 220W and a (singlechannel)A30 100W
So a total of 2560W plus the AB-amp plus sacd-player etcetc (so around 3kW)
All will be divided over 3 phase power
So I is a lot but not more than a hot-air-oven or a waterboiler or something like that...



ps the '1500W" ab-amp can draw 1500W from main but it is 2x400W@4Ohm, sorry for confusion