β24 Pieterh's build

beta24

Re: β24 Pieterh's build

Postby Pieterh » April 11th, 2018, 9:45 am

For the following job we need a special engineering tool, an engine hoist to place the heavy PSU carefully in the tight B24 engine room :idea:
10 Engine hoist 2.jpg

Doing this properly leads to the following situation:
10 Hoisting the PSU in the engine room.jpg

In the end I used 20mm brass standoffs to accomodate the wiring, the barrier terminal (star ground etc) underneath the PSU bottom plate. Originally, I had planned to use 15mm standoffs, but I think that a bit more space was better. When you design your back panel and the position of e.g. the loudspeaker binding posts you need to take into account the height of the PSU bottom plate which is dermined by the standoffs and the PSU plate thickness (4mm here).
In addition, I could connect my 30cm twisted transformer wires directly to the Sigma 22 for 'maximum sound quality', wow. But, 30cm was a bit short, so I advise you to order a transformer with longer transformer wires (40 or 50 cm) for more convenience (tighter twisting possbilities, more flexible wire routing underneath).
12 Use of 20mm brass standoffs to accomodate Xformer wiring -Xformer direct coupling to S22 for 'maximum SQ'.jpg
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Re: β24 Pieterh's build

Postby Pieterh » April 11th, 2018, 10:54 am

13 Angle view 1 without back panel.jpg

14 Angle view 2 without back panel.jpg

16 Side view.jpg
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Re: β24 Pieterh's build

Postby Pieterh » April 11th, 2018, 11:03 am

In order to mount the back panel I had to find a way to get an m4 nut down to the bottom left and right corners where fingers don't go. And first mounting the back panel and then the PSU was also not an option. Here is my solution: a wrench with tape holding a nut for you:
18 Creative tools.jpg

Here I could photograph the tool in action in a top corner.
19 Creative tools in action.jpg

And here the back panel is mounted:
20 Back panel in place.jpg


To be continued....duty is calling......
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Re: β24 Pieterh's build

Postby brian92fs » April 11th, 2018, 7:28 pm

Looks great! Really appreciate the detailed photo-rich build log.

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Re: β24 Pieterh's build

Postby bk_856er » April 11th, 2018, 10:13 pm

Love the engine hoist!

BK

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Re: β24 Pieterh's build

Postby Pieterh » April 13th, 2018, 6:56 am

bk_856er wrote:Love the engine hoist!
BK

:)
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Re: β24 Pieterh's build

Postby Pieterh » April 13th, 2018, 6:58 am

Before I forget, here is a photo showing the position of the thermal breaker:
21 Thermal breaker.jpg
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Re: β24 Pieterh's build

Postby Pieterh » April 13th, 2018, 7:06 am

Yes Guys, despite all type of family and working life duties I have been able to finish my B24 within 2 years! Hurray!
This is also the right spot and occasion to say words of thanks.

First of all a very BIG THANK YOU to Ti and his unique approach to design and support (forum) of DIY audio equipment. That approach gave me confidence that even I could finish this big amp. The whole building process hasn’t been easy and I had to depart from one B24 board…….but in the end the whole process was very rewarding. Not only by the final sound quality result of the B24 (more on that later because I really have some positive things to share about the B24) but also by the nice hobby time I had at my working place and the things I learned. Another BIG THANK YOU to all other people that are active on the forum and that help each other and me with advise and sharing of experiences. I see this thread with detailed documentation and photographs of my build as my contribution to the community here. From the positive responses and likes I got on my thread I understand that it has been appreciated, Thanks! Btw: I also enjoyed it much to write everything down.

And how about this, I increased the ranking of the Netherlands, as by now The Netherlands has at least one B24 Class A/B and two B24 Class A amps (SonusBonum). I don’t know of any other B24 builders in the Netherlands, are there?

After these valuable words, let’s get back to the 170W/19kg hardware beauty and continue with the photo log. After assembling the B24 the first thing to do was to test the offset again, and it passed that test:
22 First testing offset again.jpg

Then I tested my B24 with an old loudspeaker and with my android phone with an AudioQuest Dragon Fly Red Dac/Headphone amp. Test passed:
23 First testing with old speaker.jpg

Here we have a pic of the first test in my stereo:
24 First real testing in my stereo.jpg
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Re: β24 Pieterh's build

Postby Pieterh » April 13th, 2018, 7:09 am

And here are some beauty test competition pictures where the beauty of course lies in the eyes of the B24 builder(beholder):
25 B24 completed front view 1.jpg

26 B24 completed back view.jpg

27 B24 completed top view 3.jpg
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Re: β24 Pieterh's build

Postby Pieterh » April 13th, 2018, 7:11 am

28 B24 underside.jpg

25 B24 completed front view 2.jpg

29 B24 complete Overview 1.jpg
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Last edited by Pieterh on April 13th, 2018, 11:07 am, edited 1 time in total.

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