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Old 11th May 2010, 08:36 PM   #91
teamacc is offline teamacc  Netherlands
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That is so true, but at 1 euro/cap it might be that the sound out of them is not that good at all. (not saying cheap caps all sound crap, but the more expensive ones ought to sound better)
I agree on the criteria of low voltage rating and size, but sometimes one has to consider a bigger cap sounding better, even if it picks up a little RF, then so be it.

There will ofcourse be an optimum, but the optimum might be different for the ones with the scopes and the ones without, as something that looks good on the scope, might sound crap when actually playing music.
This is not a rant to all you who use scopes :P (as i have none)

I think it is true that one should select some smaller caps with maybe lower voltage rating, but always listen to them before recommending them (as i personally dont like the sound of wimas...)
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Old 11th May 2010, 08:51 PM   #92
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Quote:
Originally Posted by teamacc View Post
That is so true, but at 1 euro/cap it might be that the sound out of them is not that good at all. (not saying cheap caps all sound crap, but the more expensive ones ought to sound better)
I agree on the criteria of low voltage rating and size, but sometimes one has to consider a bigger cap sounding better, even if it picks up a little RF, then so be it.

There will ofcourse be an optimum, but the optimum might be different for the ones with the scopes and the ones without, as something that looks good on the scope, might sound crap when actually playing music.This is not a rant to all you who use scopes :P (as i have none)

I think it is true that one should select some smaller caps with maybe lower voltage rating, but always listen to them before recommending them (as i personally dont like the sound of wimas...)
I was only joking but I see that was not clear. However I wish to react to your statements:

not saying cheap caps all sound crap, but the more expensive ones ought to sound better

This is a doubtful remark as you pay for the brand name, marketing, overhead etc. as well especially when we consider so called boutique parts. Good industrial stuff that is produced in large numbers and that does not need the former named phenomenons as much can sound just as good or even better as has been proven in the years. That is hard to swallow if you just paid 30 Euro for one cap If you would use the same analogy for cars or food ...


I agree on the criteria of low voltage rating and size, but sometimes one has to consider a bigger cap sounding better, even if it picks up a little RF, then so be it.

If it picks up RF it can not simply sound better, at least it will not perform optimally. A larger cap sounds often better than a smaller one from the same series with the same dielectric but when it picks up stray RF the fact that it could sound better will be worsened by the stray RF/EMI. When one wants to use them still shielding is a must. Either do it good or don't do it at all. When switching is involved like in class D/T it is good practice to keep things as small as possible. Simply RF design criteria...


There will ofcourse be an optimum, but the optimum might be different for the ones with the scopes and the ones without, as something that looks good on the scope, might sound crap when actually playing music.
This is not a rant to all you who use scopes :P (as i have none)


Something that looks bad on the scope ( regarding RF/EMI ) will very likely sound bad as well. You should try to see what you are doing. This is often used by guys who try to do good but don't know what they're really doing and then justify that they only use their ears as that should be the best instrument. With the right tools and some time you can make your design better with slight effort.


I think it is true that one should select some smaller caps with maybe lower voltage rating, but always listen to them before recommending them (as i personally dont like the sound of wimas...)

Well, we can not debate about taste but to judge all products of one brand is difficult. For instance their MKS2 5 mm pitch series are ideal electrolytic cap replacements that fit well mechanically and also sound/measure better than the electrolytic caps they replaced. It all depends where you use them for.
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Last edited by jean-paul; 11th May 2010 at 09:20 PM.
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Old 11th May 2010, 11:11 PM   #93
v-bro is offline v-bro  Netherlands
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I've measured this, some caps show a sort of HF feedback which introduces noise residual. Some caps stay nice and clean.... The cause seems to be the size rather than the mere voltage rating itself....
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Old 12th May 2010, 01:19 AM   #94
cOz is offline cOz  United States
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Would it be possible to get the amps without the pot?
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Old 13th May 2010, 05:58 PM   #95
indoubt is offline indoubt  Netherlands
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Have I missed it or was the size of the board not mentioned. I would be interested to know the size of the board.
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Old 14th May 2010, 10:05 AM   #96
noj91 is offline noj91  United Kingdom
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HI all
board dimensions (wxdxh) 128x81x38mm board thickness 1.6mm

I've made direct connection of the power supply to the tank cap pins (easy since they are untrimmed) raising the supply from 22.5V to 24V and have bypassed onboard pot with short links. 47K pot by the way.
Input cap options are provided by three sets of pads on the board giving pitches of31.24.15mm and combinations.
Overall how does it sound? absolutely fabulous in my system. Jeff Buckley's Grace totally spellbinding and I've heard expensive systems struggle with that cd.
A well thought out board and definitely quality bargain!
cheers jon
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Old 14th May 2010, 12:00 PM   #97
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Jon, did you notice any difference to the sound when connecting the powersupply directly to cap pins? I havn't tried that yet.


Quote:
Would it be possible to get the amps without the pot?
No, but you could bypass it like Jon did.
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Old 14th May 2010, 12:04 PM   #98
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Also:
The latest update from hifimediy is another 4-7 days before I have more boards.

And, I have to adjust the price to 45USD incl shipping for one board. 2 or more boards will still be 42USD each. This is because another shipping fee I wasn't aware of showed up and also there was a misunderstanding between me and hifimediy making me believe the boards with package where a little lighter then they actually are. Hope this is not a to big dissapointment for anybody.
I will also shortly put them on ebay. but the prices there will be more expensive to cover the high ebay fees, probably 48usd.
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Old 14th May 2010, 03:30 PM   #99
noj91 is offline noj91  United Kingdom
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Hi all

@Nick difficult to say really but on the whole I feel the amp is now sounding more musical could just be running in or my ears acclimatising. Initially I felt the highs to be a little dry this is not the case now and I am very happy!!!

Good to see that more of these amps will be available soon we need the appraisal from those with the verbage and experience ...Tempted Scott? Have a go way better than my stock sure 4x100

cheers jon

Many THANKS Nick!
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Old 14th May 2010, 03:31 PM   #100
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Default AC?

I saw earlier that this board takes AC as well as DC. What are the power requirements (e.g., what sort of transformer would it need)?
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