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The Pioneer Super Linear Circuit
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Old 18th January 2018, 04:42 PM   #121
Morde is offline Morde  Finland
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I will definately keep the both! Itís nice to have some alternatives at hand for different kind of genres and listening moods.

I still havenít tried the X-feed on PSL so that might be a joker card for it to shine even more.
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Old 18th January 2018, 04:47 PM   #122
EUVL is offline EUVL  Europe
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Same effect on both.


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Old 18th January 2018, 05:05 PM   #123
Morde is offline Morde  Finland
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Yeah, if the X-feed proves to be a winner for me then Iíll add it to UTHAiM as well.

BtW I painted the sinks and made some sort of top cover. Still to do a new front panel and tidy up some wirings.
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Old 18th January 2018, 05:37 PM   #124
EUVL is offline EUVL  Europe
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Looks good.

BTW you should update the list of your signature.


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Old 18th January 2018, 06:14 PM   #125
dabore84 is offline dabore84  Netherlands
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The Pioneer Super Linear Circuit
Nice work Morde!
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Old 25th January 2018, 03:35 PM   #126
EUVL is offline EUVL  Europe
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BTW would you mind tell me your matching distribution for the NPN's & PNP's ?
You can PM me if you do not want to disclose in public.


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Old 26th January 2018, 11:58 AM   #127
Morde is offline Morde  Finland
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Here's what I was able to gather at this point. I ordered 100 pcs of both 2SA and 2SC devices, but the sums say I have lost almost ten of each. Anyway, it seems that the HFE values are much higher with the batches I got compared to the Fig. 5 in the pdf guide. The overlapping region with my devices is approx. 590-625 while in the pdf it is 480-520.
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Old 26th January 2018, 12:14 PM   #128
EUVL is offline EUVL  Europe
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These cheap DMM are not accurate on absolute hfe values.
So what you measure as 600 may well be 550 on my meter.
But the distribution does not look too different.
The PNPs have higher average and the overlap is small.


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Old 27th January 2018, 12:56 PM   #129
EUVL is offline EUVL  Europe
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Morde,

Please check PM.


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Old 12th March 2018, 04:48 AM   #130
EUVL is offline EUVL  Europe
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The hfe distribution of the 2SC3324/2SA1312 shown by SB is consistent with my experience and that of Morde.
Judging from what was shown in the photos I believe you can find enough pairs for the build.

As already mentioned in the article,

"For minimising even harmonic distortion, it is important that :
1) Q1,2,7,8 are hfe matched;
2) Q11,12, are hfe matched, as are Q13,14;
3) Q3,5,9 are hfe matched; as are Q4,6,10;

But the hfe between 1), 2) and 3) can be different.


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