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Old 10th February 2013, 10:41 AM   #1401
PMA is offline PMA  Europe
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Quote:
Originally Posted by Libby123 View Post
Yes I did. What should be 11uF is 10,96uF
And the 33,3uF part is 33,29uF
the Resistors I dont measure, but if I have my soldering station warm, I will recheck.
As a "Neumann " I used a blank wire (as everybody did).

CompCaps = the compensation caps in regulator.
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Old 10th February 2013, 11:15 AM   #1402
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These values should be 11nF and 33.3nF.

First experiment would be to add 200pF to the 11nF caps.... If loosing too much highs, reduce to 100pF.

Also R18 is indicated as 9k1 r but I found using 9k9 instead can lift the mid freq and provide a much more linear response.

With 9k1 in some systems can produce a dip in the mids and a lift in the highs.

IMO worth to try
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Old 11th February 2013, 07:23 PM   #1403
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Default Capacitors bad vs good

So I told you to get a ‘bad capacitor’, so they tell me. Last weekend I was in a far, far, far away place called ‘FrickelFest’ and the question was asked, so here is the answer. Politically correct it would be; there are no bad capacitors, but some are just less sophisticated. What was the context of the question you may ask, so it was booze, lots of it, LP’s where involved, Paradise was discussed. Ahh… you may now think it’s all about Paradise, and yes it is. The notion is, there are no bad capacitors in Paradise, and I did not meant to tell anyone to add a bad capacitor to Paradise.

Now on a more serious note, what capacitor can be a less sophisticated one, and what are the others (that do not need to be less sophisticated). Is we take a look at the PSU of the Paradise build we see four electrolytic capacitors in each PSU (these are C100(100u), C101(10u), C103(100u) and C105(10u)) from these the first 3 should be good, low ESR, high quality, types. The fourth one, C105, needs to be of a lesser type (not bad, but less sophisticated ), the most important parameter here is ESR, this fourth capacitor, C105, needs to have an ESR of between 1 and 3 Ohm.

None of the four electrolytic capacitors that can be found in the PSU are very quality critical, if any you should select C104 to be a nice high quality one, one with low ESR and a very good frequency bandwidth. For the first three (C100, C101 and C103) select a nice Panasonic audio grade one, for the fourth (C105) select a (most of time very cheap) type with a higher that average ESR.

Here is a selection of low ESR audio grade (what ever that is ) capacitors:
Aluminum Electrolytic Capacitors - Leaded | Mouser

Here a selection of higher ESR capacitors:
Aluminum Electrolytic Capacitors - Leaded | Mouser

For the low ESR selection sort the list on price and get one of the more expensive ones, for the high ESR type do the opposite, sort on price and get one of the cheapest. Check the datasheet and verify that the capacitor is the one that is right, made of the right stuff, for the job, if in doubt ask One thing you should do is, select a capacitor with a temperature range up to 105C, these will have a longer application life (125C would even be better ).

You could use this as the high ESR part http://www.lelon.com.tw/down.php?f=%...-P68%20RGA.pdf and do not use this one http://www.mouser.com/ds/2/293/e-lf-217854.pdf but it will be a verry nice one to select as one of the low ESR, high quality ones.

P.s. the booze is wearing off

These are the most important/relevant messages regarding PSU and Pre-Reg.
  1. Mpp #4375 PSU-pre-regulator.
  2. Mpp #4610 V2 Schemas UPS and Amp.
  3. Mpp #6506 CCS fine-tuning.
  4. Mpp #6462 PSU with my notes.
  5. Mpp #6809 Do not try to feed the CVS of the CCS of the shunt with a regulated power supply.
  6. Mpp #7127 More about transformer selection.
  7. Mpp #7635 Single and dual transformer wiring (also corrected drawing) (See also #7733).
  8. Mpp #7733 Grounding (PSU, RIAA and Player).
  9. Mpp #7810 35V PSU for the CroMagnon.
  10. Mpp #7830 The PSU explained.
  11. PradiseBuilders #13 Schema's and assembly guide.
  12. PradiseBuilders #155 Vdc input voltage minimum simulated.
  13. PradiseBuilders #970 PSU oscillates; posible solutions?
  14. PradiseBuilders #983 Compensating the PSU for oscillations.
  15. PradiseBuilders #1173 Fixing oscillations (up to #1182).
  16. PradiseBuilders #1322 Fuse .
  17. PradiseBuilders #1387 Updated Paradise R3 assembly guide (Also German).
  18. PradiseBuilders #1403 Capacitors bad vs good.
Have a look at these and their following messages.
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Last edited by FdW; 11th February 2013 at 07:45 PM.
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Old 12th February 2013, 08:58 AM   #1404
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Quote:
Originally Posted by FdW View Post
P.s. the booze is wearing off
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Old 12th February 2013, 08:09 PM   #1405
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Hi

Thank you, Frans

One more Question:

Which is the minimum Input Voltage into the PSU?

I have found in the thread 2x 28V AC as Input in the Preregulation,
some people plan to use only 2x24V AC.
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Old 12th February 2013, 08:36 PM   #1406
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Tried 24 V DC entering the Paradise suply and it feels like is loosing a bit of autority and controll id does still work

24 V AC X 1.471 is about (consider diode loss and such) 35 V DC sink especialy one on goodies bag will get realy hot

18 V AC 26 V DC is reccomended but see Above
20 V AC 29 V DC IMO is one that sound best whitout pushing heath to far as the suply is on board and in same enclosure one need cosider thermals and efect they have on other transistors

Last edited by Bksabath; 12th February 2013 at 08:46 PM.
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Old 13th February 2013, 07:10 AM   #1407
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PradiseBuilders #155 Vdc input voltage minimum simulated.
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Old 13th February 2013, 10:55 AM   #1408
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Old 13th February 2013, 04:06 PM   #1409
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by hifi_cat View Post
Hi

Thank you, Frans

One more Question:

Which is the minimum Input Voltage into the PSU?

I have found in the thread 2x 28V AC as Input in the Preregulation,
some people plan to use only 2x24V AC.
Use 18Vac up to 20Vac, the 18Vac is fine but you need to use a good, low drop, rectifier diode. Some people may find that the 18Vac transformer leaves to little regulation margin (see #1406), in that case (or to prevent that) a 19Vac or 20Vac transformer may be your poison in my opinion there is no harm in using a 20Vac transformer (the amount of 'extra' dissipation is less than 1.5Watt).

And, 24Vac, not to mention 28Vac, is too high! (Good catch Bksabath).

Last edited by FdW; 13th February 2013 at 04:11 PM.
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Old 13th February 2013, 06:09 PM   #1410
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tanks Frans
It can be done but extra cooling is a must I toke a few temperature mesurament on MY Paradise R2

It may be worth to run the trafos on a Variac ad see what happens with different voltages IMO 18 AC may be a bit border line botom and IMO Paradise start to loose a bit of the fantastic attack

Naturaly if one is stuck with a pair of trafos with higher voltagge there are gains to be made by implementing a further CRC in the pre regulators
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