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The Pioneer Super Linear Circuit
The Pioneer Super Linear Circuit
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Old 2nd January 2018, 05:54 PM   #111
Morde is offline Morde  Finland
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Yeah, the bigger the better! I guess this could well be a power amp enclosure but what the heck - the heatsinks were cheap and I had the Makerbeam parts laying around.
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Old 3rd January 2018, 09:56 AM   #112
EUVL is offline EUVL  Europe
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I have been asked whether the Super Linear Circuit can be used as a Power Amp.

Of course it can.
You probably want to replace the following components :

Q13 2SD2560
Q14 2SB1647
R17,18 1.5k
R19,20 0.1R 2W

You can also raise rails to +/-20V without issues, assuming you are using CCS bias and no servo.
And you could set bias at say 1.3A.
(Use 10k trimpot for the Vbe multiplier)

I have not simulated or built.
There is no Spice model I can find for the Sanken Darlingtons.
And no idea about thermal stability of bias.


Patrick
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Old 3rd January 2018, 12:44 PM   #113
EUVL is offline EUVL  Europe
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And since we are on the subject, can we convert the output Darlington follower to a triple Darlington for Power Amp use ?

Yes, we can.

Attached only simulated.
I cannot find Spice models for 2SC4886 /2SA1860.
So I used the Cordell models for MJL4281 / 4302 instead.
But they should not be too different.

So if you already have a working headamp, you can change R19/20 to 68R.
Then add the power stage by P2P hard-wire.
And then you are in business.

The thermal stability of bias needs to be tested in prototype of course.
But they should be OK when mounted on a common heat sink adequately sized.

The basic circuit is really very versatile.


Patrick

.
Attached Files
File Type: asc SL BJT HPA V0 CCS PwrAmp THD.asc (13.4 KB, 51 views)
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Old 7th January 2018, 08:33 AM   #114
Morde is offline Morde  Finland
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Hi Patrick. I have a question about the toggle switch in the crossfeed circuit board. Does the wiring to the switch carry the audio signal? Should I try to keep the cablings as short as possible to avoid interference?
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Old 7th January 2018, 08:38 AM   #115
EUVL is offline EUVL  Europe
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Yes to both.
Best is to try first with switch and later replace with jumper.


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Old 12th January 2018, 11:52 AM   #116
Morde is offline Morde  Finland
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Yay, It’s rocking! Even though the top cover is not yet produced and the front panel is also only temporary... But hey it sure sounds nice, better listening impressions later. I attached a couple of pics. I have noticed along my projects that I just can’t make the wirings tidy. Propably just too lazy. The main thing is that it’s completely hum free and only faint hiss can be heard with iPhone plugs, but not with my other headphones.

Thanks Patrick for providing yet again a superb HPA project!
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Last edited by Morde; 12th January 2018 at 12:02 PM.
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Old 12th January 2018, 03:19 PM   #117
EUVL is offline EUVL  Europe
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The hiss should go away when you tidy up your wiring, especially all the digital stuff.

I presume you are using JFET input buffer, CCS bias and no DC servo.
I should be interested to know how you compare this to your (also ZGF) UTHAiM.
(Stixx and I agreed on our impressions.)




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Old 12th January 2018, 04:27 PM   #118
Morde is offline Morde  Finland
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The hiss is practically non-existent so it doesn’t bother me. Yes, my setup is exactly like you described. I’m also excited to compare with the UTHAiM since I allready liked the sound of it very much.

Last edited by Morde; 12th January 2018 at 04:30 PM.
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Old 18th January 2018, 04:19 PM   #119
Morde is offline Morde  Finland
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Hereís some listening impressions.

UTHAiM vs. Pioneer Super Linear (no X-feed)
- Very close to each other
- UTHAiM a tiny bit better in bass control (The Mars Volta - Wax Simulacra)
- PSL has deeper bass and control is also good (Massive attack - Teardrop, Children Of Bodom - Blooddrunk)
- PSL has better sense of presence with vocals (Norah Jones - Donít know why). Feels like the singer is in the room with you.
- Sounsdtage is better/sharper with PSL
- Treble is equally good on both
- PSL is somehow smoother and very pleasant to listen to
- PSL a bit warmer sound

It really is hard for me to tell these two apart, but with a small margin the PSL is little better. Might be that my front end and my hearing capabilities are starting to limit the achievable benefits with these ultimate headphone amps. Maybe my next project is a new DAC...

I did the comparison mainly with my LCD-2F cans but the differences seemed to be very similar with Senn HD-800.
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Last edited by Morde; 18th January 2018 at 04:45 PM.
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Old 18th January 2018, 04:29 PM   #120
EUVL is offline EUVL  Europe
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So if you are only allowed to keep one, which one would you keep ?

- UTHAiM a tiny bit better in bass control
- PSL is somehow smoother and very pleasant to listen to

We agree with the two above.
Difference is really tiny.
But the PSL is, for me, slightly complexer in terms of circuitry.

They still cannot beat the DAO SE (for me at least).
The DAO SE is just that touch "sweeter" with female vocal.


Patrick
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