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Old 18th February 2013, 07:14 AM   #1461
hesener is offline hesener  Germany
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Quote:
Originally Posted by sq225917 View Post
I've tried every 0.5 volt from 24 -29 and have settled on 26.5v. Things don't get too hot and it sounds good. Though to be honest until the supply starts drooping I can hear no difference, 26 sounds just like 27 and 28 and 29.
thanks for sharing, this is good input
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Old 18th February 2013, 07:36 AM   #1462
hesener is offline hesener  Germany
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Here you go, new group buy starting:

Paradise phono stage
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Old 18th February 2013, 07:51 AM   #1463
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The transistors I bought,their Hfe just don`t matched.
1.BC337-40 hfe:390-450
2.BC327-40 hfe:530
3.CT-BC327-40 hfe:330

Perhaps we could exchange if you happen to have those within these Hfe range.

Last edited by Mikewong; 18th February 2013 at 08:04 AM.
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Old 18th February 2013, 07:28 PM   #1464
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When using J109's in the PSU you may want to lower R108/208 from 3.3k to 1.8k, which will keep Id at 1mA.
How important is this? Are there changes to the amplifiers recommended if J109/J107 are used?

Is it ok to mix SK170 and J109?

Regards
Sven
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Last edited by Abraxas336; 18th February 2013 at 07:44 PM.
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Old 18th February 2013, 07:48 PM   #1465
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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.
Ricardo,

please excuse my ignorance because it is certainly here in this thread but what R's do you propose for 11n/33,36n C's?

Thanks
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Old 18th February 2013, 07:50 PM   #1466
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Abraxas336 View Post
How important is this? Are there changes to the amplifiers recommended if J109/J107 are used?

Regards
Sven
As I did say

Quote:
Originally Posted by FdW View Post
When using J109's in the PSU you may want to lower R108/208 from 3.3k to 1.8k, which will keep Id at 1mA. But if you leave the 3.3k resistors in place it will still work nicely at an Id of 600uA, it will lower the GBW a tiny bit. The point is you could temporarily use the J109 with the 3.3k resistors, and later replace the J309's with J310's while everything keeps on working
This thing is designed for 1mA so it should run at 1mA, for this purpose a J310 was selected because it fits the job description. You could use a J309 at this point but to have it running at 1mA you need to adjust the resistor. How important is this? I do not know, I'm just de designer of the PSU, these are the values I selected, calculated, simulated and tested, and it works great. Would other values work, maybe, but I should have to re-calculate, re-simulate and re-test. The point is, when designing these things you make decisions and now that it is build time you stick to them, otherwise the whole design process is dismissed, and you have to start all over again.

So what should you do? get a few J310's and make it work.
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Old 18th February 2013, 08:14 PM   #1467
RCruz is offline RCruz  Switzerland
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Originally Posted by Abraxas336 View Post
Ricardo,

please excuse my ignorance because it is certainly here in this thread but what R's do you propose for 11n/33,36n C's?

Thanks
Sven
Hi Sven

There are no "perfect" values for resistors when using 11n for the high freq cap and 33.3n for the mid freq turnover.

IMO the relation between the 33.3nF cap and it's series resistor is fundamental so to get 318uS... As I said 9550r x 0.0333 = 318uS

When using that combination, the 11n cap should be raised to 11.4nF to cope with Stanley Lipshitz rules.

If you increase the 11nF cap to 11,4nF you might loose some detail and "air" so it is necessary to reduce the "bass resistor 73.5k" accordingly.

In a first attempt I would use 143k parallel with 140k to reach 70742ohms.

But as we all know, rules are only rules and no rule is good if it can not withstand some exceptions.... The preconized Paradise values provide a "house curve" that is quite agreable with loads of bass slam and pinpoint detail. In my system it was a little "off shore" so I recalculated it.

Just to remenber, I am actually using the following combination:
147k // 147k = 73700 ohm for the "bass resistor"
32.1nF in series with 9902r for the 318uS middle point
11nF for the trebble resistor
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Last edited by RCruz; 18th February 2013 at 08:43 PM.
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Old 18th February 2013, 09:26 PM   #1468
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Originally Posted by FdW View Post
This thing is designed for 1mA so it should run at 1mA, for this purpose a J310 was selected because it fits the job description. You could use a J309 at this point but to have it running at 1mA you need to adjust the resistor. How important is this? I do not know, I'm just de designer of the PSU, these are the values I selected, calculated, simulated and tested, and it works great. Would other values work, maybe, but I should have to re-calculate, re-simulate and re-test.
I assume J309 is supposed to be J109 in your post. In this case it would make sense to add your comment regarding R108/208 to the assembly guide/BOM. Everybody who participated in the parts GB recieved J109 and it was news to me that I should (may?) change resistors.

Ricardo: Thanks. Reason for my question is I would like to avoid any additional emphasis of anything since my system has plenty resolution anyways. However, now I have 11n/33,36n caps which I ordered specifically for the paradise. I'm a bit reluctant to change these, changing a couple of R's however is ok.

Since it will probably be lost I'd like to ask my other question again: is it ok to mix SK170 and J109?

Regards
Sven
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Last edited by Abraxas336; 18th February 2013 at 09:35 PM.
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Old 18th February 2013, 09:29 PM   #1469
Nick77 is offline Nick77  United States
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Doing some soldering and just noticed an extra hole in the board for a 330r resistor in the power section. Do i ignore this hole in the middle and solder to outside hole?
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Old 18th February 2013, 09:43 PM   #1470
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Do i ignore this hole in the middle and solder to outside hole?
Yes.
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