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Old 21st March 2013, 09:47 PM   #1821
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Bksabath View Post
One can take the temperature out of the sinks with a bit of work.
This is diy after all
Case has a couple of holes covered with Stainless steel mesh outside the inner skin
and heat is transfered there with same cooper.

At the same time consider that inside the inner skin the temperature must be prety constant and no air current are alowed to stop the thermal drift
I am really amazed with the thermal complexity
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Old 21st March 2013, 10:00 PM   #1822
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That is BJT territory, thermal distortion.
Nearly all parameters of a BJT are related to temperature.
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Old 21st March 2013, 11:34 PM   #1823
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Quote:
Originally Posted by RCruz View Post
I am really amazed with the thermal complexity
Well 60 ish dB gain in ventilated case and thermal drift

Fact is Paradise needs 26 V in to work and 26 - 18 = 8 volts that ge turned in to heat no big deal and it is worth the effort IMO.
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Old 22nd March 2013, 11:48 AM   #1824
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I have just changed the PSU transistors With the Toshiba's on one channel a quick listen to the noise (just the phono stage plugged in) and there is a big difference between the 2

When I say big difference I mean ear glued on to a Small set of speaker monitors and amplifier volume at max on my loft system barely audible on normal circumstances big difference mean that I can ear difference
By no mean I am emply that Paradise is noisy as it is not compared to many others I have, now is just a bit better.
I am going to change the PSU transistors on the other one and do a swap on the J110 with same 2SK170BL that I have in stock and compare the 2.

Unfortunately my test set up is pants Crappy scope and the Audiophile 192 + virtinis and ARTA has noise level of -80 dB so I feel ashamed to post any screen shoot but I am quite happily relay on battered 50 OD years old test rig that any way is pretty good (tanks Mama)

How nice wuld be if some one do this properly and maybe use transistor sokets to compare results is not for me to decide.
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Old 22nd March 2013, 11:54 AM   #1825
Salas is offline Salas  Greece
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In your case a reduction comes from the CVS/CCS portion then. Maybe it had oscillations also that you solved with the Toshibas. You had shown a very thick line going much better on your scope with that change, but still not reduced to a really thin line. Your scope is 20MHZ analog and its much better for residual noise than entry level DSO. Just compare the line when your GND crock is shorting the probe's nose pin. If its much finer than what you get when scoping your rail, then the difference is genuine.
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Old 22nd March 2013, 12:10 PM   #1826
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Tank you Salas will do that straight away
I just hope that this is taken as constructive effort to make a really exceptional phono stage and not as criticism to all involved
The Paradise is really good and to make this for DIY community deserve highest praise.

I am foolish mechanic by choice no problems with that but if hard work is needed I am happy to do it.
Electronics is pretty new to me so tanks for the effort to make me understand things better.
Love...
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Old 22nd March 2013, 12:24 PM   #1827
Salas is offline Salas  Greece
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When we build we should give feedback, if it solves some weird stuff its to the better. Others benefit or try to see if they can confirm, test further. Testing and trying is much better than just testing. Its community spirit.
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Old 22nd March 2013, 01:08 PM   #1828
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Bksabath View Post
Tank you Salas will do that straight away
I just hope that this is taken as constructive effort to make a really exceptional phono stage and not as criticism to all involved
The Paradise is really good and to make this for DIY community deserve highest praise.

I am foolish mechanic by choice no problems with that but if hard work is needed I am happy to do it.
Electronics is pretty new to me so tanks for the effort to make me understand things better.
Love...
And when there is a hint of a possible improvement, I will jump in in, study it, publish my result, and from the experience I will have gained some knowledge (most of the time) and that is what I like

BTW If anything you should go for the J113 (not the 2SK170) in the PSU
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Old 22nd March 2013, 01:09 PM   #1829
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Salas View Post
When we build we should give feedback, if it solves some weird stuff its to the better. Others benefit or try to see if they can confirm, test further. Testing and trying is much better than just testing. Its community spirit.
Also when we design, we seek (should seek) feedback
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Old 22nd March 2013, 01:24 PM   #1830
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Default Transistors faulty ?

Hi Floks
Yesterday in the evening I soldered the jumpers ,10kohm Res.at the input and put in the last missing parts in the RIAA section ( Thanks a lot Peter )
After power up, I saw and have measured following :

1. All LED's are on, no smoke and not so much heat, Happy
2. ThenI measured +/-18 Volt looks good.
But now problems, I have ca. +/-15volt,at the amp output and
ca. 15 Volt Ext. RIAA. both numbers to high.
Amp input ca. 2,5 Volt? Both boards exactly the same.

There is defently no short circuit what I can see.
Alfred say in his excelent user manual maybe a problem with the output
Buffer transistors. My problem is I have no clue where are this transistors
sitting and no clue how I can check them.
Many thanks for any help!!
Take care
Werner
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