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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
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Old 8th March 2018, 08:40 PM   #951
xrk971 is offline xrk971  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
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Originally Posted by GnuB View Post
Since more than half the heat would be radiating inward (assuming everything is mounted inside), isn't there a potential for excessive heat build up affecting, or decreasing the life span of, the speaker materials (cones, surrounds); even with the 20W version?
It will be warmer inside the cabinet - this is where adding insulation pads internally would help. Foil covered pink Owens Corning fiberglass anyone? That would force heat to radiate outwards.
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Old 8th March 2018, 09:57 PM   #952
monotube2 is offline monotube2
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
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Originally Posted by xrk971 View Post
It will be warmer inside the cabinet - this is where adding insulation pads internally would help. Foil covered pink Owens Corning fiberglass anyone? That would force heat to radiate outwards.
Mounted outside on the back side, directly wired to the speakers ( no binding posts )
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Old 8th March 2018, 11:54 PM   #953
xrk971 is offline xrk971  United States
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Alpha 20 GB2 Update

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Danibosn - 2 sets
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Old 9th March 2018, 04:00 PM   #954
Juntuin is offline Juntuin  Finland
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Not the prettiest one, but I'm quite close to fire her up for a test drive. If there's no smoke, then resistors swap, final casework and other stuff.
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Old 9th March 2018, 04:14 PM   #955
Vunce is online now Vunce  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Juntuin your right there!
Just double check power wiring and fire her up
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Old 9th March 2018, 04:16 PM   #956
6L6 is offline 6L6  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Don't forget the fan! Those heatsinks will not be able to do much passively cooled, and the amp's largest thermal load is at idle.
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Old 9th March 2018, 04:35 PM   #957
xrk971 is offline xrk971  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier-img20180309_185516-jpg

It's looking good and very close to first sound. Can you please show closeup of how you clamped the MOSFETs to those Dell CPU coolers? Usual L-angle and screws?
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Old 9th March 2018, 04:47 PM   #958
Juntuin is offline Juntuin  Finland
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Hi, I wont forget fans i'll power them first with external aux supply. Usually I check wires like 10 times, don't trust myself enough.

Theres just thick aluminium plate bolted on top of mosfets, needs some reinforcement, it was 5mins quick and dirty experiment. Maybe a little longer and bolts to other ends also. Bolted L-angle would be stiffer and I might chance to that later.
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Old 9th March 2018, 07:51 PM   #959
pcgab is offline pcgab  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
My new heatsinks arrived today, they should be ample for 20w Alpha. I'll attach a few quick pics for scale.

Each heatsink is 8" of this profile:

http://www.heatsinkusa.com/10-080-wi...inum-heatsink/


I'm pretty swamped for awhile, but I'm hoping to sneak in some time to get these prepped. I've matched my mosfet's and just need to mount to heatsinks, then wire up the proto-chassis for first sound.
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File Type: jpg IMG_0031.jpg (962.9 KB, 239 views)
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Old 9th March 2018, 08:50 PM   #960
Juntuin is offline Juntuin  Finland
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Looking good Gable, hoping we have couple of rocking Alphas more soon
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