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Post by bluebeat13 on Feb 5, 2022 18:28:12 GMT
Its a start for each channel, nice to see it progressing well with them Oli  Must admit had mixed results with silt foils with amps they do impart a certain tone, I found they suited pre amps psu's and dac, in pre's and dac's for big stiff supplies they lack the ideal traits I rerquire, however they do have a good tone. Keep up the good work sir!
You could say that the silt muddies the presentation? |
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Bigman80
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Post by Bigman80 on Feb 5, 2022 18:42:42 GMT
Its a start for each channel, nice to see it progressing well with them Oli  Must admit had mixed results with silt foils with amps they do impart a certain tone, I found they suited pre amps psu's and dac, in pre's and dac's for big stiff supplies they lack the ideal traits I rerquire, however they do have a good tone. Keep up the good work sir!
you should have kept that to yourself,if i know oli that will niggle away at him lol Lol, No it won't. They were selected for a specific reason. |
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Bigman80
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Post by Bigman80 on Feb 5, 2022 18:43:14 GMT
Its a start for each channel, nice to see it progressing well with them Oli Must admit had mixed results with silt foils with amps they do impart a certain tone, I found they suited pre amps psu's and dac, in pre's and dac's for big stiff supplies they lack the ideal traits I rerquire, however they do have a good tone. Keep up the good work sir!
You could say that the silt muddies the presentation? 🤣 |
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Post by misterc on Feb 5, 2022 19:21:58 GMT
No it doesn't muddy the sound lol, no it has a more soronious effect with the sound (pleasing), the acid test with any qual;ity capacitior is the dynamic rendering both in the macro and micro layering and the ability to recover quickly (and quietly) from large discharges caused by repeated bass transeients and large scale dynamic swings. Whilest keeping the music utterly linear and cohesive. Still have a few of them left from a project I did a couple of years ago.
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Bigman80
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Post by Bigman80 on Feb 5, 2022 19:27:54 GMT
No it doesn't muddy the sound lol, no it has a more soronious effect with the sound (pleasing), the acid test with any qual;ity capacitior is the dynamic rendering both in the macro and micro layering and the ability to recover quickly (and quietly) from large discharges caused by repeated bass transeients and large scale dynamic swings. Whilest keeping the music utterly linear and cohesive. Still have a few of them left from a project I did a couple of years ago. What do you use Tony? |
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Post by Deleted on Feb 5, 2022 22:06:14 GMT
You remember that Tom uses 4x 22,000uF caps per channel on his Power 686?
Is 80,000uF going to be enough for both?
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Bigman80
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Post by Bigman80 on Feb 5, 2022 22:46:29 GMT
You remember that Tom uses 4x 22,000uF caps per channel on his Power 686? Is 80,000uF going to be enough for both? He may do, but Angus has designed the power supply, which is different to Toms anyway. Thinking back, I had 40,000uf in my first 686, and that was absolutely fine. |
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Bigman80
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Post by Bigman80 on Feb 11, 2022 11:53:38 GMT
Boards are here!!!!  |
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Post by sq225917 on Feb 11, 2022 12:04:04 GMT
It begins
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Post by pete on Feb 11, 2022 12:29:44 GMT
You remember that Tom uses 4x 22,000uF caps per channel on his Power 686? Is 80,000uF going to be enough for both? He may do, but Angus has designed the power supply, which is different to Toms anyway. Thinking back, I had 40,000uf in my first 686, and that was absolutely fine. Pleased to hear that! |
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Bigman80
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Post by Bigman80 on Feb 11, 2022 12:55:30 GMT
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Post by mikeyb on Feb 11, 2022 13:56:02 GMT
You've plenty to be getting on with anyway 😉 😂 |
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Bigman80
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Post by Bigman80 on Feb 11, 2022 14:16:46 GMT
You've plenty to be getting on with anyway 😉 😂 Believe me, i know this lol |
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Post by mikeyb on Feb 11, 2022 14:47:54 GMT
You've plenty to be getting on with anyway 😉 😂 Believe me, i know this lol What to do is take flight around the world heading east and you'll arrive home yesterday, that'll help, worked for Phileas 😉 😆 |
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Bigman80
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Post by Bigman80 on Feb 11, 2022 15:10:04 GMT
Believe me, i know this lol What to do is take flight around the world heading east and you'll arrive home yesterday, that'll help, worked for Phileas 😉 😆 Not a bad idea, trouble is i will then have an extra day waiting for parts lol |
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Post by mikeyb on Feb 11, 2022 15:17:20 GMT
What to do is take flight around the world heading east and you'll arrive home yesterday, that'll help, worked for Phileas 😉 😆 Not a bad idea, trouble is i will then have an extra day waiting for parts lol Drat and Double drat! 😂 |
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Bigman80
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Post by Bigman80 on Feb 12, 2022 22:45:05 GMT
James Transformer is now back up and running after the New Year shutdown, so the two O-Core transformers have been ordered. I also have the PC-TRIPLE C on order for the internal wiring. All I can do now is wait for it all to start landing. misterc is kindly going to remove those naff connections in the signal path and then everything can be soldered directly into the PCB. I cant wait to get this thing up and running. |
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Bigman80
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Post by Bigman80 on Mar 7, 2022 21:38:38 GMT
Right, second case ordered from the same seller I get the cases for the BB3s and the Avalon stuff. Whilst it's £38 more expensive than I originally paid for the exact same case elsewhere, I do have a bit more faith that he'll actually get it here.
A BB3 case I ordered 4 days ago is already in the UK with FedEx.
Fingers crossed it makes it this time.
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Post by sq225917 on Mar 7, 2022 23:39:47 GMT
80,000uf, is that per channel?
88,000uf per side in mine+ 400va a side...
You're letting the side down Oli.
To be fair I noticed f3ck all difference adding the second psu boards. Maybe a touch more grip flat out in the bass, maybe.
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Bigman80
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Post by Bigman80 on Mar 8, 2022 6:53:09 GMT
80,000uf, is that per channel? 88,000uf per side in mine+ 400va a side... You're letting the side down Oli. To be fair I noticed f3ck all difference adding the second psu boards. Maybe a touch more grip flat out in the bass, maybe. Hahaha, no, 40,000 per channel I am letting the side down!, but I wanted to use that particular Kemet cap but couldn't get the value I wanted. Or, couldn't get them for the budget. I can up them at a later date, but I have doubled what was in my original 686. The O-Core transformers are 300va per channel. I had a 600va single Toroidy before. I don't think I need more. It's good for around 150wpc. Should be fine!. The good thing is that what we are doing is tweakable. I can go bigger if I need to. |
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optical
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Post by optical on Mar 8, 2022 8:01:22 GMT
Power supply people!
I have a question, basically it revolves around these design principals:
Is it better to go complete over-kill/engineering on the PSU (where you can effectively all but eliminate ripple etc)?
or
Is it better to have a power supply 'just' capable of supplying maximum current/draw as a smaller supply could have a different (and possibly more pleasing) sonic signature? (Resulting in more speed/clarity etc).
Sort of akin to using the thinnest gauge signal wire possible without sacrificing any frequency response or extension. Of course the design of the PSU can make components sound different but I wonder where the point of diminishing returns is reached and indeed if it could actually hinder overall SQ if going far beyond that point?
It may have lower ripple or other technically superior parameters but is it possible that it might actually not make a good listen?
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Post by jimbo on Mar 8, 2022 8:05:19 GMT
I would suggest somewhere in the middle.  |
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optical
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Post by optical on Mar 8, 2022 8:26:09 GMT
I would suggest somewhere in the middle.  Yeah that makes sense Jim, just wondered if there were possibly advantages of one over the other which people might view as more important than the trade-offs of the opposite design, if you know what I mean? I'm doing some reading up in the mean time but interested to hear from a few horses mouths so to speak. I'm garnering the general consensus here is to go a bit over on the engineering spec, hence my wondering if there are more drawbacks than advantages. - Should probably start a thread on it if I can't find one - |
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Post by jimbo on Mar 8, 2022 8:33:45 GMT
I believe massive over kill power supply is indeed expensive and probably why it is not usually implemented in many commercially available amplifiers. This is quite a good article on amplifier design and may give you a steer on what you want to achieve? Some of the advantages and disadvantages of amplifier power supply design. www.tnt-audio.com/clinica/ssps1_e.html |
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Post by sq225917 on Mar 8, 2022 19:48:34 GMT
Over size for va doesn't hurt, for caps there is an optimum value of capacitance for any psu, but things like ripple and crcrc, crclc, play just as much of a role. The 686 has 90db of psrr so psu noise isn't an issue. I still snubbed the psu in mine though, actual measured value for least ringing using a c-rc filter, rather than just guessing
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Bigman80
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Post by Bigman80 on Mar 17, 2022 19:15:45 GMT
FINALLY! A CASE!!!!!  |
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Post by sq225917 on Mar 17, 2022 20:12:25 GMT
IT'S ALIVE !#@$?
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Bigman80
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Post by Bigman80 on Mar 17, 2022 21:37:55 GMT
Well not yet it isnt, but this is a big step closer. |
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Post by sq225917 on Mar 18, 2022 18:17:36 GMT
Let's see it then
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Bigman80
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Post by Bigman80 on Mar 19, 2022 15:02:58 GMT
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