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Old 26th January 2013, 01:18 PM   #391
EUVL is offline EUVL  Europe
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PCB tracks on the amp board for the MOSFETs are minimum 10mm wide, double layer 70m.
That is equivalent to 1.4mm2, but solid copper with a large surface area.
And two conductors in parallel to half the inductance (& resistance).


Patrick
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Old 26th January 2013, 03:08 PM   #392
Horio is offline Horio  United States
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My new toy:

Click the image to open in full size.

Now I just need to learn how to use it!
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Old 26th January 2013, 03:52 PM   #393
EUVL is offline EUVL  Europe
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Looks good.

One of the things that please me most with this project, despite all the trouble, is how many of you has taken the trouble to learn to build amplifiers properly.
Hopefully that will be the first of many years when you can really enjoy this fastinating hobby.


Patrick
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Old 6th February 2013, 02:40 AM   #394
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Default Degen resistors and mute board

Hi,
Please take a look at the images 'Degen resistors' and 'Mute connection'.

On the 'Degen Resistor Image' :
1) Is the regen resitors solder onto these pads?
2)Are the jumpers position for the Q11A, Q14A, Q10A and Q7A correct?
3) Is it okay if I didn't remove the tefron sleeve for the jumpers between Q6 and Q15?

On the 'Mute Connection Image':
4)Does the last hole on the Mute board extend all the way to the amp board or is just extended to the Input board only?
5) The holes right after R103 and R104, where do these goes to?

Thanks in advance.

PMChoong
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File Type: jpg Degen resistors.jpg (586.9 KB, 197 views)
File Type: jpg Mute connection.jpg (402.1 KB, 200 views)

Last edited by pmchoong; 6th February 2013 at 02:52 AM.
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Old 6th February 2013, 02:49 AM   #395
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Default 2sk170bl

Hi all,

I brought some 2sk170BL from a local shop and I wonder if they are fakes.
The ones on the left are Nic's and the ones on the right are mine. Are these fakes and how do you tell?

Thanks again.
PMChoong
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Old 6th February 2013, 05:43 AM   #396
NicMac is offline NicMac  Italy
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>On the 'Degen Resistor Image' :
1) Is the regen resitors solder onto these pads?
2)Are the jumpers position for the Q11A, Q14A, Q10A and Q7A correct?
3) Is it okay if I didn't remove the tefron sleeve for the jumpers between Q6 and Q15?

Yes, yes and yes.

>On the 'Mute Connection Image':
4)Does the last hole on the Mute board extend all the way to the amp board or is just extended to the Input board only?
5) The holes right after R103 and R104, where do these goes to?

The wire does not go all the way to the amp board.
The two holes are the amp inputs and goes to the XLR sockets.
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Old 6th February 2013, 05:44 AM   #397
NicMac is offline NicMac  Italy
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>I brought some 2sk170BL from a local shop and I wonder if they are fakes.
The ones on the left are Nic's and the ones on the right are mine. Are these fakes and how do you tell?

Fakes in my opinion. Trace them or measure Idss.
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Old 6th February 2013, 06:42 AM   #398
EUVL is offline EUVL  Europe
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I would not say so.

You can have 2SK170BL which have 2.54mm leg spacings (on tape, not in bid).
Mine looks exactly like those on the right.

Only way to find out is curve trace, or measure Idss, then ndegen 5R, 10R, 15R.
And then plot the values to get the curve.

There are enough people with "curve tracers" around.


Patrick
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Old 6th February 2013, 07:23 AM   #399
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Default 2sk170bl

Hi Nic and Patrick,

Thanks. I brought these 2sk170BL couple weeks back.... wonder if they refund.
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Old 6th February 2013, 07:26 AM   #400
qusp is offline qusp  Australia
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they look fine to me
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