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Chip Amps Amplifiers based on integrated circuits

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Old 24th June 2003, 09:55 AM   #101
Raka is offline Raka  Europe
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Default I knew it

I knew you were behind my spelling , but my main concern was to be out of tune in my "Táraritoti, Táraritoti". Was it ok?
I was thinking to listen this evening to a Rawsthorne violin concerto, but maybe I decide on Beethoven, which is easier to spell...
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Old 24th June 2003, 10:00 AM   #102
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Raka

At this stage you better stick to Elgar

peter
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Old 24th June 2003, 11:04 AM   #103
fedde is offline fedde  Netherlands
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Quote:
Originally posted by Raka
Fedde,
Interesting your comments about the fickleness of your GC, (Then you have to assume that your GC is female ) Were the changes noticed with the very same recordings?
Which improvements were the good, the bad and the ugly? I'll soon report the effect of solid core pure cooper wiring, as I expect to success here.
I had many oscillation problems. Then sometimes the sound is superb (especially during night) and sometimes somewhat unpleasant and tiring. Even my DAC has had oscillation problems, don't know why. I think I use proper decoupling. Sometimes the DAC sounds bad (tiring) and then I turn it on and off and it sound very good.

Regarding improvements: I have written quite some posts on Diyaudio and the amp discussion forum. I still plan to make a follow up on the Thor-amp page, but I am waiting to have solved all problems. Two changes I recently made were changing the feedback to 330 k (and also the resistor on the + input to 330 k) and connecting the resistor on the + input with a 'private' wire to the potmeter ground. Going to 330 k solved quite some problems for me (increase stability, especially on loud volumes). But the amp is not fully quiet now, with 220 k it was! (maybe, there is a new problem, I also changed some other things). Peter Daniel said that the stereo placing got worse when using 300 k. Maybe he's right, the problem is that it's quite some work to change the feedback resistor. Peter can just build two amps and compare...

And I would try single CAT5 cables, untwisted as speaker cable. And preferabbly the plenum rated teflon variant, which I can not find here in the Netherlands.
This should be close to the 47 Labs OFC cable...

Fedde
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Old 24th June 2003, 12:38 PM   #104
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fedde,

330k on the + input may be the reason for the noise, that's too much.
Anyway, more gain usually also means more noise, although I think that for a power amp 220k feedback is ok, and for an integrated amp (with pot) 300-330 may be better.
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Old 24th June 2003, 03:18 PM   #105
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Quote:
Originally posted by fedde


Peter can just build two amps and compare...


I built two amps and compared. One had 250K the other 300k feedback resistor. 300k was more pleasing on vocal and the DC offset was less, but overall the sonics are more "right" with 250k, which although seems to be little bit more forward, provides more spatial information and more natural sound.

All this combined with Cardas chassis wire which gives a bit more extra of the above. With my current setup MSRE860 diodes are definitely not good choice as they are too bright. I'm changing the diodes in all supplies to MSR860 and wire from Kimber to Cardas.

Although it seemed to be OK, using MSR860 with Kimber umbilical cord.
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Old 24th June 2003, 03:32 PM   #106
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Quote:
Originally posted by Peter Daniel

Although it seemed to be OK, using MSR860 with Kimber umbilical cord.

Peter, I'm curious...
What type of Kimber cable do you use?
It's for the PSU, I understand...
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Old 24th June 2003, 04:00 PM   #107
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Here are two supplies, one with Kimber, one with Cardas. I actually have quite a few of those replaced Kimber umbilicals (terminated, with matching amp sockets). If anybody's interested we might talk a deal
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Old 24th June 2003, 04:30 PM   #108
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Quote:
Originally posted by Peter Daniel
Here are two supplies, one with Kimber, one with Cardas. I actually have quite a few of those replaced Kimber umbilicals (terminated, with matching amp sockets). If anybody's interested we might talk a deal
You still didn't say what Kimber cable is that.
It seams to me like 8VS speaker cable or something around that.
8TC is very good for power (and for speakers ), but is has a darker blue tone (well, the picture is not that clear).
Plenty of people are using 8 TC speaker cable for power chords and with good results, like a friend of mine, which has replaced all the power chords of his system for 8TC and says it's fantastic.
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Old 24th June 2003, 04:37 PM   #109
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Black &blue is Kimber 4TC (8 strands) in my picture. As good as Kimber cable is, Cardas is simply better. Also, twice as expensive
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Old 24th June 2003, 04:46 PM   #110
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Quote:
Originally posted by Peter Daniel
Black &blue is Kimber 4TC (8 strands) in my picture. As good as Kimber cable is, Cardas is simply better. Also, twice as expensive
4TC is exactly the cable I have in my main system for years, as speaker cable and I am a very happy owner indeed.
In your picture it seamed a lighter tone so I was thinking of the 4VS.
Anyway, 8TC has the double of the conductors and is also double the price.
And people say it's excellent as a power chord, but fiddly to put all those wires inside a plug.
Do you use the same cable for connecting the toroid to the mains?
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