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Aleph 0 layout for Aleph J
Aleph 0 layout for Aleph J
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Old 27th January 2020, 12:37 PM   #1
wowbagger is offline wowbagger  United States
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Aleph 0 layout for Aleph J
Default Aleph 0 layout for Aleph J

I'm contemplating building an Aleph J (or BA-3 - can't decide), and I'm looking to maximize heatsink area for a given footprint.

I'm looking at the Aleph 0 case design for inspiration (attached). Four identical heatsinks, one on each face, makes for easy construction compared to the later Aleph models with the different heatsink on the rear containing the inputs (attached). I'm considering four of the 5U/300mm Dissipante heatsinks.

However, since the inputs on the Aleph 0 are pushed to the bottom of the casing (attached), which is where the transformer is located, the input signal wiring is very close to the transformer (attached). In contrast, the traditional Dissipante layout puts the transformer relatively far away from the input wiring (attached).

Would the Aleph 0 layout result in unnecessary amounts of noise? Is the additional footprint worthwhile? I'd also have to scale back the heatsinking to the normal 4x 5U/200mm - certainly doable, but I'd like heatsink temps as low as possible.
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File Type: jpg aleph-0-4-pass-labs.jpg (37.9 KB, 459 views)
File Type: jpg IMG_9446.jpg (368.0 KB, 437 views)
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Old 27th January 2020, 01:08 PM   #2
2 picoDumbs is online now 2 picoDumbs  Australia
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Aleph 0 layout for Aleph J
You can actually buy those aleph heat sinks from a diyaudio member.
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Old 27th January 2020, 05:34 PM   #3
wowbagger is offline wowbagger  United States
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Aleph 0 layout for Aleph J
Thanks, but if you mean these sinks, they're in a completely different price bracket than the common Dissipante sinks at the DIYaudio store.
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Old 27th January 2020, 05:39 PM   #4
TungstenAudio is offline TungstenAudio  United States
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I was initially interested in those heatsinks as well, but the price was way too high to make building a pair of monoblocks an attractive option.
Regarding the proximity of the circuitry to the power transformer – the aleph amplifier circuit is relatively insensitive to picking up electromagnetic feilds. No signal transformer, such as used in the M2 or F6.
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Old 28th January 2020, 02:34 PM   #5
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Aleph 0 layout for Aleph J
Thanks!
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Old 21st March 2020, 04:56 PM   #6
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Aleph 0 layout for Aleph J
Default Progress

Found some salvage heatsinks on eBay - approx. 9" x 12" each with a 1/2" thick heat spreader/base. This thing sure is heavy.

Bottom panels are 3.5" high. The rear panel will have all inputs/outputs. I'm debating whether to run a power switch to the front panel - I'd like to keep AC lines short, but it would be convenient.

At this point, the plan is to mount two output devices on each sink and run each device at about 30 W - temps should be reasonably low. I'm wondering if the thing is bolted together well enough so that the base (1/8" aluminum) could dissipate the 25-35 W for a dual-mono 30mF-CapMx-30mF PSU. I'm planning on using thermal compound for final assembly.

If I can't mount the pass transistors on the base, I'll have to run leads up to the main heatsinks. In view of this, I shrunk the Gtose CapMx to fit right on the leads of the transistor, so the only "flying leads" I'd need would be the output of the first cap bank, the input of the second cap bank, and a line back to ground.

It's this line back to ground that concerns me. Would it go back to the star? to the capacitors?
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File Type: png Annotation 2020-03-21 125341.png (296.8 KB, 106 views)

Last edited by wowbagger; 21st March 2020 at 05:02 PM.
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Old 30th March 2020, 05:21 PM   #7
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Aleph 0 layout for Aleph J
Default Progess

Pictures, in order:
1. Back panel cut and drilled
2. Top perforated sheet fitted
3. Baseplate drilled and feet attached
4. Toroids (2 Antek AS-4222) mounted and cute face installed on the underside of the internal ledge. This is the chassis upside down - compare to pictures in previous post.
5. Second angle showing ledge

If the space looks tight in the pictures, it's because my guest bathroom is my apartment's best approximation of a workshop.
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File Type: jpg IMG_0283.jpg (857.9 KB, 91 views)

Last edited by wowbagger; 30th March 2020 at 05:37 PM. Reason: rotate picture
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Old 30th March 2020, 05:30 PM   #8
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Aleph 0 layout for Aleph J
looking good
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Old 30th March 2020, 05:41 PM   #9
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Aleph 0 layout for Aleph J
title changed as requested.
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Old 30th March 2020, 06:04 PM   #10
wowbagger is offline wowbagger  United States
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Aleph 0 layout for Aleph J
After realizing that $10 in plated perfboard from Amazon was a lot cheaper than $100 of custom PCBs that may or may not work as a first-time design (and would be delivered a lot sooner), I switched from my original plans for a slick SMD construction (see Babelfish J thread here) to tried-and-true through hole components, and I'll be laying out the motherboard about the same as shown (except P2P instead of a PCB, of course). The CapMx and PSU will also be P2P on perfboard.

Since I'm keeping it simple, I'm no longer cascoding the input pair (for now - I did toss a few extra transistors in my Mouser cart, so we'll see what happens to those), and I'm keeping the voltage at about 25 V after the CapMx. With the generous heatsinking, I think I'll shoot for about 2.5 A total bias.

I haven't even hit the halfway point of this build and I'm already thinking about how this chassis and PSU would be perfect for a BBA-3. This hobby is a slippery slope!
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File Type: png Annotation 2020-03-30 135203 2.png (50.7 KB, 75 views)
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