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Old 28th October 2012, 12:59 PM   #101
pdul is offline pdul  Denmark
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Unfortunatly i am still waiting for the smd components, i guess i should have followed my own advice
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Old 28th October 2012, 01:04 PM   #102
brianco is offline brianco  Ireland
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Location: Scottish Borders - Kelso; on the famous Tweed River!
.......good; I'm not getting old after all! Thanks for that pdul.
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Old 28th October 2012, 01:07 PM   #103
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For certain reasons its not a thread to wait another month.
First ive got a quite sufficient phonostage,
second im still looking for a matching MC cart,
and last but not least, the prereg is hunting me in my Dreams.
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Old 28th October 2012, 01:15 PM   #104
pdul is offline pdul  Denmark
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To be honest, i think that a lot of the talk about the prereg, can be compared with wheather the color of your champagneglass matches the interior of your Rolls Royse.
I doubt my old ears can hear the result of all that effort.
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Old 28th October 2012, 01:18 PM   #105
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Daccord,
but,
still...
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Old 28th October 2012, 06:41 PM   #106
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Why one wuld use a colored glass escapes me
But then being a roller one understand. loads of money no class...

Now if it was old gulietta or dino one wuld newer use colored glass or glass at all for that...
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Old 29th October 2012, 09:48 AM   #107
hesener is offline hesener  Germany
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Quote:
Originally Posted by pdul View Post
The reading on the output is jumping arround like someone who has been sitting in an ants nest But the input and powersupply readings are steady like a brick wall.
Did notice some of that behaviour myself, but it went away after a day or so. But then, remember I had wild oscillation problems with rev1 so that might have masked this. with rev2 (which is essentially rev 3, what you are building, no such issues.

I think it might be the elcaps in the input that are still forming. you may want to leave it running overnight and check the next day. alternatively, you could take the caps out and connect them to a 9V battery overnight, all in parallel... thats cheating a little bit....

pdul, do you have an oscilloscope? can you check the output waveform? the DMM might not tell you the true story. you could also put a 1nF cap in series with 100kOhm at the output (RC highpass) and measure the voltage across that resistor. If the DMM does not show zero, it might be oscillations....
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Old 29th October 2012, 10:21 AM   #108
pdul is offline pdul  Denmark
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alternatively, you could take the caps out and connect them to a 9V battery overnight, all in parallel... thats cheating a little bit....
This could give some nicey explosions, since the input caps are 6800/6,3v, but i know what you mean[QUOTE]alternatively, you could take the caps out and connect them to a 9V battery overnight, all in parallel... thats cheating a little bit....

I dont have a scope, but i will try the cap/resistor approach
Thanks.
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Old 29th October 2012, 10:26 AM   #109
pdul is offline pdul  Denmark
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Sorry! It seems i f..... up with the quoting
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Old 29th October 2012, 10:43 AM   #110
pdul is offline pdul  Denmark
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I measure ca. 10mv over the 100k resistor, so oscillation it is
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