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Old 10th December 2012, 08:37 PM   #481
FdW is offline FdW  Netherlands
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Originally Posted by RCruz View Post
No more J310 in my stock.... can I use J107 instead... seems to have comparable Idss but much higher Cdg.... ?!
Yes you can but change the resistor (from 3.3k) to 2.7k (the current set should be (about) 1mA).
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Old 10th December 2012, 08:56 PM   #482
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Yes you can but change the resistor (from 3.3k) to 2.7k (the current set should be (about) 1mA).
Hi Frans,
this little secret will be part of the german translation of the building guide,
tanksalot !
Btw,
what happens if not ?
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Old 10th December 2012, 11:11 PM   #483
hesener is offline hesener  Germany
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hi guys,
got 3 more questions in my head i hope you can help me with - i`m not that confident about those things

1) the Paradise R3 assambly guide shows a pic of the installeion on the last page - it looks like there are XLR connectors besides the RCA IN/OUT - is that right?
i thought the R3 does not deliver a balanced output - is this only an unbalanced XLR taken from the RCA output?

2) Input impedance selector - what is the best choice? thought about a rotary switch with 2 Pole/Deck x 6 Positions?? other suggenstions?

3) Load impedace resistors - i thought 10R, 47R, 100R, 249R, 475R, 1000R would be a good choice. am i missing something?

thank you guys for your support!
regards,
michael
Hi Michael,

1) yes thats what I did, I have XLR connectors on my turntable, so I wanted connectors to connect it to. Of course the inputs and outputs are unbalanced, the connectors are simply unbalanced XLR

2) Thats exactly what I did

3) same thing here. Dale RN65 worked fine for me

Hope that helps!
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Old 11th December 2012, 06:34 AM   #484
FdW is offline FdW  Netherlands
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Hi Frans,
...what happens if not ?
If not what?
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Old 11th December 2012, 06:50 AM   #485
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Originally Posted by FdW View Post
If not what?
(the current set should be (about) 1mA)
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Old 11th December 2012, 08:17 AM   #486
miepa is offline miepa  Austria
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Originally Posted by hesener View Post
Hi Michael,

1) yes thats what I did, I have XLR connectors on my turntable, so I wanted connectors to connect it to. Of course the inputs and outputs are unbalanced, the connectors are simply unbalanced XLR

2) Thats exactly what I did

3) same thing here. Dale RN65 worked fine for me

Hope that helps!
Helps a lot, thank you Alfred!!!
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Old 11th December 2012, 08:20 AM   #487
RCruz is offline RCruz  Switzerland
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Originally Posted by FdW View Post
Yes you can but change the resistor (from 3.3k) to 2.7k (the current set should be (about) 1mA).
Thank you Frans.

Can I also use J107 in the amp's output buffer ?
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Old 11th December 2012, 08:23 AM   #488
hesener is offline hesener  Germany
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Originally Posted by RCruz View Post
Thank you Frans.

Can I also use J107 in the amp's output buffer ?
I did that and it works fine, the "problem" being that there is a -1.5V offset now, since the J107 has a larger IDSS. That is no issue for circuit performance, just limits a little bit the headroom which is still very high...
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Old 11th December 2012, 08:26 AM   #489
RCruz is offline RCruz  Switzerland
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But it is a compromise... I will keep searching for j310 then What Idss would you recommend ?
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Old 11th December 2012, 08:50 AM   #490
hesener is offline hesener  Germany
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Originally Posted by RCruz View Post
But it is a compromise... I will keep searching for j310 then What Idss would you recommend ?
Try the J109, at IDSS = 40mA (thats the center value for J310 but the lower datasheet limit for J109). That should be fine, as at these currents the threshold voltage impact is pretty big, so the devices will perform quite similar.
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