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Old 3rd April 2007, 09:40 PM   #91
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Join Date: Nov 2004
Location: Bruchsal/Germany
Hi Nino ,

sorry but i am not a SL 10 expertise owner .
Normaly Pabst is known for the good motors they made , never aware
that they building volume pots .
Never heard of that OTBE-Thing , sorry cant say about the whole mod .


E-Mail is following ..

Greetings from Germany

Jürgen
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Old 3rd April 2007, 10:20 PM   #92
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Two comments:
1) Judging from the thread you started about solid state preamps and tube amps, it seems to me that this is an idea to approach with caution. If you are used to, and prefer, the sound of tubes, you may not be happy with solid state, regardless whose design it is.
2) I am always wary of people touting modified pieces of equipment. Although I'm a big fan of modifying things, I find that there are lots of people out there who absolutely, positively, beyond all shadow of a doubt have no clue what they're doing. None.
Whether a modification is an improvement not only depends on the concept, but on parts quality and on execution. I have recently seen some really horrendous modifications perpetrated by people who were ignorant of even the most rudimentary knowledge of how to solder, much less how to intelligently change a circuit.
Buyer beware.

Grey
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Old 3rd April 2007, 10:39 PM   #93
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Sad but true.....
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Old 4th April 2007, 10:52 AM   #94
Mywing is offline Mywing  Italy
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Thanks for answers Juergen,Grey and "Retro".
In truth I am very happy with my tubeamps (ARC SP10/D115) especially in the vinyl listening; some less in digital because preamp's high level inputs are not good as phono.
However the major reason for which I want to purchase a solid state preamp is that in the summer with the warm temps we have here in Sicily , I usually stop music listening because with heat developed by tubes I should hear naked and absorbed in a tub of water with dices of ice...
Other drawback, as all you know, is that if you want to listen to music for only a half hour, it is not worth of not even to turn on tubeamps...
Then to obviate I have decided to purchase a new amplification to use in the summer or in less binding listening (in the morning when I shave me...) .
In the last weeks I have purchased a cheap but very good vintage power, a Pioneer M73, and now it is the time of the preamp.
From what I have explained, you can understand that I look for one with a good line input, to improve that unexceptional of SP10; which sounds well with my tube-power, and in the summer can cheer me with the delicious M73.
I have been able to try in my system a Sony TAE86B (very beautiful but bad with tubes); a Burmester 838 (excellent, but only phono); a ML and a Krell, not good in my system; a JR Coherence 1, excellent; a Pass Aleph, splendid, and a Thresh Fet Ten, also excellent.
I have not tried other, but to the light of the done tests, I think that with a Threshold/Pass I should not be wrong and for not spend a lot of money the SL10 should be the optimal solution... I have never heard it, but from what I have read it is one of Mr. Pass' best products.
But I should find a good shape one (by the way, there is one on Audiogon with new Elna caps... what do you think of it?).
Well, excuse me if I have dwelled too much, but you have asked...
If I'll not resolve my problem, will mean that I'll spend my money in a beautiful (Mosfet ) basin to fill with frozen water and to dip in my feet in the summer during my music listening...
Best best best wishes and greets,
Nino
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Old 4th April 2007, 03:32 PM   #95
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Default a thought:

Mywing - just be aware that most of the differences we hear in stock gear is merely comparing one junk part to another, and not really in any way associated with the circuit design itself. It just makes me shake my head in pathetic disdain when reading a review on some piece of equipment that some reviewer drags on and on for months only to be followed up being revealed that some cheap caps are in the power supply or signal path. The state of audio should be light years ahead but seems to be the only field that rejects progress. If I had the answer as to why I'd state it here but I'm actually at a loss to know myself, as others have wondered as well. And no, I don't speak for all gear but there is a lot that I do.
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Old 4th April 2007, 04:52 PM   #96
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Default Re: a thought:

Quote:
Originally posted by RetroAudio
Mywing - just be aware that most of the differences we hear in stock gear is merely comparing one junk part to another, and not really in any way associated with the circuit design itself.

So all equipment sounds alike, assuming equivalent parts? Before you indulge in 'pathetic disdain' I suggest you build a few of the Zen series, which have wildly varying topologies. Use any sort of parts that suit you. They do not sound the same.
There are more fertile fields to plow if you set your sights on levels of negative feeback, inadequate power supply design, bias, etc. than saying that parts quality is the primary determinant of sound quality. Is parts quality important? Yes. Is it the be-all, end-all? No.

Grey
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Old 4th April 2007, 05:53 PM   #97
Mywing is offline Mywing  Italy
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Thanks for your opinions guys.
Nino
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Old 28th July 2009, 06:15 AM   #98
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Saw this thread Threshold SL10 schematics and manual

and remembered from years gone all what we talked and did with the various iterations on the classic NS10 and some rambling on the SL10 on this thread too… and though it would be cool to try this one too as a line stage at least for me.

Some of the goodies on this topology is that has double polarity PSU so no caps on the signal path and that is has a servo to control the DC at the output, nice in this case from my point of view. And finally also from MPOV is that it’s a single ended design which I happen to like. Oh yes…also fewer parts count

I did happen to find what I think is the original schematic in one of the various threads on the topic but of course Nelson has the last word if this is really the original schematic.

http://www.diyaudio.com/forums/attac...amp=1227418567

From this last link I draw the attached schematic witch seems a bit clearer to work with Please let me know on any error since I plan to make a layout to etch some boards since I do have some available time now.

Of course now a day it’s tempting to replace the 4 front end tranies with JFET and maybe use +-9V PSU (from batteries for testing purposes). Any takers for this iteration? Maybe EUVL, ZM, Andrew…. so many other nice guys around which are more capable than me.
Attached Files
File Type: pdf sl10 layout 1.pdf (46.8 KB, 186 views)
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Old 28th July 2009, 05:07 PM   #99
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Guess the SL10 will appeal to guys wanting a RIAA phono gain stage since most others will be happy enough with the simplicity of the B1 buffer if what you need is only the vol control.

Anyway, here is a link to a review and specs of the SL10 @ Audiogon.

http://forum.audiogon.com/cgi-bin/fr...rea&1202765651

Cheers,
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Old 28th July 2009, 09:53 PM   #100
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apass

just look in Papa's pdf - discrete OPs for DIYas (or something like that)

everything is written there , and if I remember correctly - there are also variants with Jfets in input LTP
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