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21st March 2013, 03:39 AM
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#1791 | |
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diyAudio Member
Join Date: Oct 2009
Location: Brunei
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Quote:
Hairpullingly mad!!!  Maaaad, I tell you, maaaad!
__________________
-------- TDA1541a-S2 / 6072a / MediaplayerDac -- Michell Gyrodec -- Aikido Preamp -- Pass F5 -- Audio Physic Tempo 2SE -- Yamamura Cabling |
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21st March 2013, 09:09 AM
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#1792 |
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diyAudio Member
Join Date: Dec 2007
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Good morning all
Just for clarity Is Q107 R108 and Q207 R208 that need changing? I got a stash of 2SK107BL from Mouser from time to time they do get same so place your order and eventually they will arrive. I am going to try those this morning, if SHE lets me, I don't have the J113 but I will get same for the R3 boards. Last edited by Bksabath; 21st March 2013 at 09:11 AM. |
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21st March 2013, 09:39 AM
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#1794 |
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diyAudio Member
Join Date: Dec 2007
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I have been re-reading the build guide
Quote from Paradise R3 Assembly and trubleshooting guide . My recommendation would be to use values around 400 for both N and P for the input stage, whereas the other parts of the circuit can use higher gains (but please make sure you have those decoupling caps in place on the bottom side of the PCB). It sems to contradict recent posts... I believe that Joachim mentioned advantages to be had if the Imput stage has hi Hfe is this correct? I have NPN up to 550 and PNP over 600 Paradise BCXXX-40 Last edited by Bksabath; 21st March 2013 at 09:47 AM. |
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21st March 2013, 09:43 AM
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#1795 |
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diyAudio Member
Join Date: Mar 2009
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Studio, i hope you can stand that joke. Reversal happened to me too, also swapping P and N.
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21st March 2013, 09:48 AM
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#1796 |
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diyAudio Member
Join Date: Mar 2009
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The advantage of higher Hfe in the input stage is less base current so less DC into the cartridge. On the other hand we have an offset trim in the R3.
In the beginning we thought that very high Hfe in the input stage can provoke oscillation. As far as i know that is not the case. |
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21st March 2013, 10:23 AM
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#1797 | |
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diyAudio Member
Join Date: Feb 2009
Location: Both feet on the ground (near Gouda)
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Quote:
__________________
Signature Transresistance Current-Feedback BIGBT Amplifier; Push -->>{{  }}<<-- there.
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21st March 2013, 11:35 AM
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#1799 | |
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diyAudio Member
Join Date: Feb 2009
Location: Both feet on the ground (near Gouda)
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Quote:
__________________
Signature Transresistance Current-Feedback BIGBT Amplifier; Push -->>{{ }}<<-- there.
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21st March 2013, 11:40 AM
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#1800 | |
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diyAudio Member
Join Date: Oct 2009
Location: Brunei
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Quote:
I still try to blame it on the silkscreen being inconsistent
__________________
-------- TDA1541a-S2 / 6072a / MediaplayerDac -- Michell Gyrodec -- Aikido Preamp -- Pass F5 -- Audio Physic Tempo 2SE -- Yamamura Cabling |
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