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Old 21st April 2013, 03:32 AM   #901
dodog is offline dodog  United States
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Is 2SK170BL an appropriate substitute for Q4?
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Old 21st April 2013, 05:22 AM   #902
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Quote:
Originally Posted by JRKO View Post
All wooded construction. Walnut front, 18mm ply sides, 5mm ply back panel. Ventilated metal top still to come. Will have a matching 180w hifimediy bass amp and B1.miniDSP pre amp soon

Volume control is inside as this will be a power amp for hi effeciency 109db/w/m horns and need some gain adjustment but wanted to keep the front clean.

heatsinks upwards causes no issues

still have the damn turn off thump
Very nice work !

I am about the start building this amp, do you still have your turn off thump ?

My speakers are full range and sensitive, I can`t stand turn off thump..

Thanks,
Eric
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Old 21st April 2013, 07:20 PM   #903
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Thanks

Yeah I still have the thump. Its not too bad on the 97db/w/m Emkens use at the moment but I cant even contemplate attaching it to my £200 CD's yet.

Will be having a look into it when I get back from my holiday in the US of A - will post here
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Old 21st April 2013, 09:55 PM   #904
dodog is offline dodog  United States
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I contacted Spencer about sourcing Q4. Last parts question. Is there a source (digikey, mouser, etc.) for those standoffs (are they brass?) used to connect the PCB to the heatsinks available in the DIY store?
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Old 22nd April 2013, 01:00 PM   #905
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Originally Posted by curtvm View Post
I ordered parts for this amp recently, and ordered this instead-
W21-R68JI TT Electronics/Welwyn | 985-1096-1-ND | DigiKey
(I ordered the same type for the 0.47 also, just to make it look good)
I can't imagine this part will work any different than the one recommended.

I also ordered J111's so i could keep everything on one order (note J111 has different pinout, gate is not middle pin).

I'm still building, using a mix of breadboard, wire, over sized cpu heatsink, and whatever else I have on hand besides the ordered parts from digikey- Index of /~henryvm/aca
Many thanks. I will order those. Your board/layout sure looks great .
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Old 22nd April 2013, 04:29 PM   #906
bcmbob is online now bcmbob  United States
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For anyone interested in the earlier discussion on liquid cooling the ACA, here is a link to something displaying a concept that can be scaled down from its 120 mm base to 70 mm or even 40. Follow the BLAT-3 link for construction details.
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Old 25th April 2013, 06:32 PM   #907
Variac is offline Variac  United States
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We have more of the kits in the store!!
Also a few remaining pairs of heatsinks and a couple of laptop power supplies.
More power supplies and the new chassis' soon!
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Old 25th April 2013, 06:38 PM   #908
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The standoffs are brass and are M3 (metric) They are the same as used in Lian Li computer cases. (Most other computer cases use #6 standoffs which won't work for the ACA chassis' or our separate heatsinks). Once the separate heatsinks are gone we won't stock more, we'll just stock the chassis, which incorporates different design heatsinks but drilled and tapped in the same pattern.

Quote:
Originally Posted by dodog View Post
I contacted Spencer about sourcing Q4. Last parts question. Is there a source (digikey, mouser, etc.) for those standoffs (are they brass?) used to connect the PCB to the heatsinks available in the DIY store?

Last edited by Variac; 26th April 2013 at 05:16 AM.
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Old 25th April 2013, 06:46 PM   #909
dodog is offline dodog  United States
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Originally Posted by Variac View Post
The standoffs are brass and are M3 (metric) They are the same as used in Lian Li computer cases. (Most other computer cases use #6 standoffs which won't work for the ACA chassis' or our separate heatsinks). Once the separate heatsinks are gone we won't stock more, we'll just stock the chassis, which incorporates drilled and tapped heatsinks.
Thank you for that information!

Will the new chassis accommodate the heatsinks that are in the parts store now?
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Old 25th April 2013, 08:46 PM   #910
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no, unfortunately they are not compatible, although both have tapped holes to mount the boards and MOSFETS


If you're going to order a chassis probably best to just make do with any heatsink temporarily. Easiest would be with holes drilled all the way through and each of the MOSFETS attached with a bolt (and insulator of course). The PCB's can be attached the same way to the sink or to something thin attached to the heatsink.

The chassis' are awesome IMHO and should be available within a month. .

Last edited by Variac; 26th April 2013 at 12:41 AM.
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