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Old 23rd March 2013, 10:50 AM   #1851
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Werner Hammelmann View Post
Maybe interesting as well, with the amp plugged the heat sink temperatur
is down (from 50 without amp) to 38 degree after 30min
Have a nice one
Werner
That is normal, if the amp is not connected then the PSU dissipates all, with the RIAA connected then dissipates about halve of the energy.
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Old 23rd March 2013, 11:17 AM   #1852
RCruz is offline RCruz  Switzerland
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Hi Werner

Please see the attached pic of the board where I included parts numbers.

The output buffer fets 90 and 99 are in the center of the board.

Once I had to replace 99 to get things working.... also the top fet 90 (J310) should be chosen with a high Idss / Vp otherwise the buffer might not work properly and produce big offset.
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Old 23rd March 2013, 12:59 PM   #1853
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Tanks for posting that Riccardo loads of work there.

I am back on after the Toshiba transplant and delighting neighbors with same nice tunes.

First impression is more focus and solid sound stage.

I have not done the Jfet change 6.4 C in the loft and 4 in of snow outside lovellly.

Just in case remember that pin out for J fet change...

I am pretty sure that there is much more to be had out of this baby and I am a bit reluctant to start with the R3 boards till we know a bit more about any progress with the German Forums.

What up boys?
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Old 23rd March 2013, 01:31 PM   #1854
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Quote:
Originally Posted by Bksabath View Post

First impression is more focus and solid sound stage.

In my limited experience, the biggest improvement as far as sound stage perception goes is derived from proper grounding techniques and especially taking ground return currents into account. Sadly, this will probably require a new pcb. R4?
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Old 23rd March 2013, 01:34 PM   #1855
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I agree, grounding makes a big difference.
I also found when the last bit of hum is eroded that the bass sounds better.
More clear, deeper, more dynamic.
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Old 23rd March 2013, 01:46 PM   #1856
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Quote:
Originally Posted by FdW View Post
That is normal, if the amp is not connected then the PSU dissipates all, with the RIAA connected then dissipates about halve of the energy.
Thanks Frans, now I am 100% sure that the PSU,s are working
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Old 23rd March 2013, 01:52 PM   #1857
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by analog_sa View Post
In my limited experience, the biggest improvement as far as sound stage perception goes is derived from proper grounding techniques and especially taking ground return currents into account. Sadly, this will probably require a new pcb. R4?
I second that (improvement wise).
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Old 23rd March 2013, 02:00 PM   #1858
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Quote:
Originally Posted by RCruz View Post
Hi Werner

Please see the attached pic of the board where I included parts numbers.

The output buffer fets 90 and 99 are in the center of the board.

Once I had to replace 99 to get things working.... also the top fet 90 (J310) should be chosen with a high Idss / Vp otherwise the buffer might not work properly and produce big offset.
Thanks Ricardo that picture is very helpfull for me.
I will change 99 and 90 straight away. Can you or someboby else
tell me how I can measure Idss and how I can check 2SK 170 or J 107
I have no clue,
Take care
Werner
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Old 23rd March 2013, 02:05 PM   #1859
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New R4 PCB needed well maybe, but noting wrong with one I got, provided one does proper grounding to start with and somebody that heard my Paradise R2 can vouch for proper execution of that.

So if you got boards for R3 don't despair Hesener did pretty good job IMO
I really doubt that I could do better especially as there is much more than grounding involved
So let's not water the wine please I am Just reporting on one change that can be easily done.

Wow can't you tell me giving up smokes...
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Old 23rd March 2013, 03:00 PM   #1860
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Hi Werner you can test the IDss I think is called sum think like that as in picture
Place 100 Hom's resistor where the Ammeter is and you can measure the V drop
I am making a rig to test evveritink but that is work in progress Got diverted...

as gate and source are connected only the self biasing current go trough the resistor
for 2SK170 BL you should get between 7 and 10 ma depending on the J fet.

I am going to post picture of work I did on that so far here
Paradise BCXXX-40
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Last edited by Bksabath; 23rd March 2013 at 03:02 PM.
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