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Topic: PaX amplifier: invitation to discussion
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KioseusZnook
6 posts
Popping In
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09-07-2008 00:54
Yes, those look quite good. Now it was my intention to put three paX amps in one enclosure and two in two others but with the cost of three enclosures I'm now toying with the idea of getting all seven into one. That's if I can find one big enough to house seven toroids, seven heatsinks, 22 pcbs, one OLED display, 1 AVR, screening... and still have good thermal properties.
Good job there's no rush!
Now when it comes to the paX pcbs, £40 Sterling for the construction of ONE paX amp from Elektor's 'thePCB Shop' is getting toward the excessive. Especially when it's only £18 for a DigiButler pcb and that's populated with SMDs to boot...
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hadihf
25 posts
Occasional Visitor
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11-07-2008 13:16
janneman01Hi Farook,
Hah! Cheap and good? Difficult  .
I am also looking at one, I made my prototype myself but that takes too long and is also not cheap.
I am looking at these:
http://www.hifi2000.it/default.asp?id=104&mnu=104
The 'pesante' are models with heatsinks. Not really cheap but look very good.
Jan Didden Hi Jan, I sent mails on your homepage address. Did you get these? By the way I yhink enclosures at www.par-metal are also good. Regards Farooq
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hadihf
25 posts
Occasional Visitor
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12-07-2008 16:20
Dear Jan,
On power amplifier schematic, Pin 3 of J10 is attached directly to L1, While on PCB tracks it is connected to junction of R65 and C10. Which is correct? Also do I have to reinforce the PCB tracks at the output?
Regards
Farooq
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janneman01
22 posts
Occasional Visitor
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12-07-2008 18:22
hello farook,
The pcb is correct. Good catch!
I am currently in Spain on vacation, I will look at my home email for your mails. If it is only one or two, you can also resend at jandidden01@gmail.com .
Jan Didden
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janneman01
22 posts
Occasional Visitor
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12-07-2008 18:23
Last time I tried par-metal it looked like they were out of business. Did you order from them recently?
Jan Didden
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norman12
1 post
Popping In
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22-07-2008 22:10
I'm building this amplifier, but have come across a discrepancy between the circuit diagram and the parts list. Could someone verify the values of R33 and R49. The circuit calls for 100ohms and 22kohms, but the parts list states 1k and 10k respectively.
Many thanks.
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janneman01
22 posts
Occasional Visitor
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24-07-2008 10:22
Hello Norman,
The values you quoted are correct. (R33=100 ohms, R49=22k). The values in the partslist are incorrect. I will ask Elektor to publish a correction. Thanks for catching that.
best regards,
Jan Didden
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KioseusZnook
6 posts
Popping In
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07-05-2009 19:27
Just wondering, after all this time, whether anyone has built their paX amps and what they think regarding its sound.
In my case I've had to postpone building mine due to being so busy with other things, but I'm hoping to get back to it after the summer.
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hadihf
25 posts
Occasional Visitor
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07-06-2009 20:02
I also started to buid one but has to stop due to shifting to UAE..but remember reading somewhere Jan mentioning that severals were built and working excellently.
Regards
Farooq
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janneman01
22 posts
Occasional Visitor
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07-06-2009 21:39
Ehhh... Ahum... not wanting to brag, but this email I received this week:
"Jan, we have spent a blissful evening listening to our new Pax. This is a seriously good amp. My twin boys asked (completely spontaneously) if I had "surround sound". Everyone likes it. Thank you for all your help and the great design."
So, *some* people like it
Jan Didden
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mick.carrick
3 posts
Popping In
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08-06-2009 11:38
As the author of the email Jan mentioned, I should perhaps elaborate a bit on why I like this amp so much.
It excels particularly at revealing subtleties of the music in a very relaxed and enjoyable way. There is absolutely nothing Hi-Fi about it in the sense of being "in your face" but it reproduces the music in a very natural way. I find I am being absorbed into the music and thinking about and enjoying music rather than an amplifier. It appears to add no character of its own to any of the various kinds of music I have listened to so far, but reveals the space in which it was recorded in a very satisfying way. It sounds expensive like some amps I definitely can't afford such as Mark Levinson, Pass Labs and others. Its power is there when called for but it has a single ended Class A sort of refinement that makes listening a genuine pleasure.
So don't hesitate to build a pair. Jan has been a great help and although it is an unfamiliar design, it is not difficult to get it right. The only caveat is to suggest that you follow Jan's advice to build and test each stage in the order he has outlined in the Construction guide. Trouble shooting should then be easy. I built mine with regulated power supplies (Boak style from AA) as a twin monoblock. The regulators were mainly to tame an overvoltage raw supply but I am sure they do no harm. The only other point is that the bias adjustments take a while to settle and its easy to get a bit carried away and raise the bias too fast (and consequently too high). In its final setting, it took several hours to stabilise.
Thanks to Jan for a brilliant design.
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Obi-Wan
6 posts
Popping In
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15-03-2010 21:01
Just a quick comment, since the issue of using balanced amplifier inputs was brought up here:
My own system, in the design phases now ( I plan to use several Elektor designs as modules, including the "High-end Preamp" and the "Crescendo Millenium Amplifier), will use balanced interconnects between all components, in part to eliminate so-called "ground loops," and in part due to a lot of RF interference in my area. I'm not happy about adding unnecessary stages, either, especially as I will hear most of my music from my computer via Elektor's "Winamp Controller" through your "Audio DAC 2000" and "96KHz Sampling Rate Converter"--needless to say I'll be trying to keep every signal as pristine as I possibly can!
I intend to use THAT 1200s or 1206s (with the bootstrapped inputs) as component input stages, with Neutrik NC3FAV connectors, and for component output stages, simple impedance-balanced outputs since to gain the advantages of balanced interconnects I don't really need to drive both the + and - audio lines, especially into the THAT 1200 series. If I actually wire an analog signal across my living room I may drive that with a THAT 1606, but between components in the main system rack I see no advantage to doing so.
Good luck!
-klo
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Admin
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22-11-2010 21:24
[ admin ]
content removed. Unable to remove post in its entirety.
Post edited by Elektor Editor
on 23-11-2010 15:34
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Admin
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23-11-2010 09:38
[ admin ]
content removed. Unable to remove post in its entirety.
Post edited by Elektor Editor
on 23-11-2010 15:34
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pat75
8 posts
Popping In
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18-06-2011 10:11
somebody to have the complet schematic of the pax amplifier
thak you in advance
patrick
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janneman01
22 posts
Occasional Visitor
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18-06-2011 11:30
Hi Patrick,
You can download the complete articles for a few dollars from http://www.elektor.com/magazines/2008/april/pax-a-power-amplifier-with-error-correction-part.399028.lynkx .
There's also an 'Audio collection 1' DVD that has the full articles, don't know the price.
I would advise to get the complete articles; this amp is bit different in concept than a 'regular' audio power amp and the articles gives some advise how to incrementally build it up and test in several steps to assure success.
best,
jan didden
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neron
1 post
Popping In
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22-06-2011 00:05
hi my name is neron
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pat75
8 posts
Popping In
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25-06-2011 09:06
thank you for answer ,but there is 4 pcb ? whom to have to utilize?
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janneman01
22 posts
Occasional Visitor
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25-06-2011 09:46
Hello pat75,
Are you asking where to get the boards? There is one board pre amplifier channel, plus one board for the protection system per channel, indeed total 4.
I understand that Elektor provides boards through their PCB service. Also, Pilgham Audio (www.pilghamaudio.com) sells complete kits; I don't know if they will sell boards only.
I recently changed the protection board so if you are going to build this amp be sure to get the latest protection board from Pilgham.
best,
jan didden
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pat75
8 posts
Popping In
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25-06-2011 12:34
dear jan i dont understand because there is 2 pcb no reflected and 2 pcb reflected for the pax amplifier?
whom to have utilized? 1and 2 or 1and 3or 1and 4or 2and 3 or 3and 4
thank you dear jan
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