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Old 16th February 2013, 12:15 PM   #1451
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Quote:
Originally Posted by Benedetto View Post
Btw;
they are real cuties from ancient eastern germany. !
Enjoy
I hope, EMZ, a "eastern" bavarian company, doesn't read this....

Peter
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Old 16th February 2013, 12:26 PM   #1452
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Quote:
Originally Posted by studiostevus View Post
As you see there are 2 types:
- marked emz (different logo than
posted earlier though), 100F (what value is that... 100pf?)
- marked s+m, 120F
It's 100pF. EMZ bought the machines from Siemens to produce these caps. But as far as I know, they are no longer in capacitor business.

Peter
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Old 16th February 2013, 01:16 PM   #1453
pdul is offline pdul  Denmark
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Quote:
Quote:
Originally Posted by Benedetto
Btw;
they are real cuties from ancient eastern germany. !
Enjoy

I hope, EMZ, a "eastern" bavarian company, doesn't read this....
Eastern western Germany
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Old 16th February 2013, 03:08 PM   #1454
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oncle_tom, you are right. Nevertheless this KPs are often sold as polystyrene or Styroflex, what is a trade name.
Does not seem to be right.
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Old 16th February 2013, 08:22 PM   #1455
Salas is online now Salas  Greece
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Quote:
Originally Posted by hesener View Post
sorry, forgot to take that scope shot. But the output voltage was fluctuating +/-100mV with frequencies below 1Hz, and when I blew on the input stage transistors the voltage was moving quite a bit.... On my well-run-in Paradise those fluctuations were much smaller.
Hey Alfred what's up? Can you please refresh me here a bit? Got around to collect some missing parts today and stuffed some already on one board. What was the story with the 150K resistors around the opamp again? Am I supposed to use an order of magnitude lower so to surely get low DC offset or is it OK I start with or about the originally recommended? Thanx.
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Old 16th February 2013, 08:39 PM   #1456
hesener is offline hesener  Germany
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hi Salas, please just go ahead with the values as published. The output voltage will show low frequency fluctuations of ~100mVpp upon first turn on, and when the whole thing settles that voltage will come down.

This voltage is driven by the low frequency noise of the input dransistors, forming of the 6800uF elcaps, and thermal variations around the input stage. If it is too much, you could e.g. reduce the capacitor of the servo. Reducing the 150k resistors R43a/b is only necessary when there is too much (DC) offset in the amplifier, and the servo output (pin 6) is very high.

If the remainder of your system is not DC coupled, you should have no issue whatsoever.

hope that helps.....
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Old 16th February 2013, 08:40 PM   #1457
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Alfred was in vacation but he is back.
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Old 16th February 2013, 08:41 PM   #1458
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cross post, telepathy ?
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Old 16th February 2013, 08:56 PM   #1459
Salas is online now Salas  Greece
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Alright Alfred cheers for the clarifications, will start by the book. I just remembered having read something about it in the past here and thought I better confirm. Having to sort out some semis now I guess. Will use linear lab PSU and single channel first so to current limit for possible stuffing errors and to gather a reference set of measurements before adding its own PSU section.
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Old 17th February 2013, 07:53 PM   #1460
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by noelectrix View Post
another pic of paradise . I did simple grounding and it is totally quiet. soundwise it startet with great dynamics but it was a little bright in my system with not very deep soundstage (a little metalised hüsker dü´sch). a post from RCruz encouraged me to play with just the 9.1k value of the RIAA and with about 9.3k to 9.6k i´ll find peace. Also the soudstage depth improved to be very good now. not shure if i had some oscillation. the improvement i felt in soundstage depth after installing the anti-osci-caps might have been a rather more psycolocical reason
so yes, it is a fantastic sounding stage. thank you!!
stefan
[IMG]Click the image to open in full size.[/IMG]
As a matter of fact, using the stock 33.3nF in the riaa filter, the most correct value for the corresponding resistor would be 9550 ohm because 9550 x 0.0333 = 318uS

So your choice of 9k6 corroborates my calculations

Of course I would not stop there and somehow reduce the bass resistor and also increase the trebble cap to 11.4n but I am glad you like the aproximation.
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