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Old 16th April 2008, 10:54 AM   #431
OneyedK is offline OneyedK  Belgium
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Quote:
Originally posted by johnm
Think I may give this tweak a try once the modded JVC has had time to burn in properly. Anyone tried this?

http://www.audioasylum.com/audio/twe...11/110291.html

- John
If you want to do something similar, use a decent EMI/RFI filter.
Audible improvements can be made to the powersupply AFTER a decent EI-transformer.
(You can harm yourself playing with capacitors at the mains voltage)
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Old 16th April 2008, 11:11 AM   #432
johnm is offline johnm  United Kingdom
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PDF can be found on page 2, post no.28.

Thanks for letting me know about the mains transformer - yeah it is a tiny unit. Hopefully in another few weeks I'll be able to change it for something better.

Yes I know one should always be wary about using capacitors at mains voltage, but this tweak has been tried and tested by many with no problems. There are mains-specific caps one can buy as well for added safety so I'll probably do just that.

The transport is sounding AWFUL at the moment - I hate this part of th eburn-in process
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Old 16th April 2008, 11:35 AM   #433
OneyedK is offline OneyedK  Belgium
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Quote:
Originally posted by johnm
this tweak has been tried and tested by many with no problems.
imho, it's more a joke than a tweak.

Unless someone can explain me how to calculate the appropriate value of that capacitor.

(those capacitors were used in CRT-TV-sets to compensate for the inductive load of the demagnetisation coil)
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Old 16th April 2008, 11:37 AM   #434
johnm is offline johnm  United Kingdom
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Try it and see?.....
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Old 16th April 2008, 11:41 AM   #435
OneyedK is offline OneyedK  Belgium
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Quote:
Originally posted by johnm
Try it and see?.....
Yeps, you can see it allright, too bad you can't hear an improvement
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Old 16th April 2008, 11:44 AM   #436
johnm is offline johnm  United Kingdom
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Everyone who's tried it would be inclined to disagree - still each to his/her own

P.S. I haven't tried it myself, but I remain open-minded until I do.
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Old 16th April 2008, 11:52 AM   #437
OneyedK is offline OneyedK  Belgium
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Quote:
Originally posted by johnm
Everyone who's tried it would be inclined to disagree - still each to his/her own

P.S. I haven't tried it myself, but I remain open-minded until I do.
I use it for diagnostic purposes.
A cap that gives audible improvement when placed in a crazy place (like at the mains input) shows that there is a ground loop problem.
Solve that (the real) problem and you can leave out the cap.

No problem with people who disagree, but I'd like to see some science behind it.
--> If you dance long enough in Belgium, it WILL rain (doing that naked in the garden doesn't actually help)
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Old 16th April 2008, 11:55 AM   #438
johnm is offline johnm  United Kingdom
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... I'd better put my clothes back on then - eeek!
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Old 16th April 2008, 12:39 PM   #439
johnm is offline johnm  United Kingdom
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Peter, is it OK to use a 16V 48VA 3-amp torroidal transformer (found one in my parts box) with the PSU? I've taken a look at the specs for the LM7808CT and the max input it takes is 34V, so I think I'm ok?

Thanks,

- John
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Old 16th April 2008, 02:04 PM   #440
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It will run pretty hot. Serious heatsinking required.
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