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Old 2nd April 2006, 09:58 PM   #31
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Default Threshold NS 10

In case anyone is interested I have a NS 10 that was recently updated by Jon Soderberg of Vintage Amp Repair.

However upon delivery back to me FedEx Ground did handle the package properly and was damaged.

The on/off switch was broken off and the transformer was dislodged from its mounting prongs.

So if anyone here has a need for one of these let me know. It is repairable, cicuit board not harmed.

At 63 now I am no longer in the diy game.

Anyone interested kindly e mail me with any info you may need and additional pics.

My best to all
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Old 2nd April 2006, 10:20 PM   #32
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Default Re: Threshold NS 10

Quote:
Originally posted by yeoldestereo
In case anyone is interested I have a NS 10 that was recently updated by Jon Soderberg of Vintage Amp Repair.

However upon delivery back to me FedEx Ground did handle the package properly and was damaged.

The on/off switch was broken off and the transformer was dislodged from its mounting prongs.

So if anyone here has a need for one of these let me know. It is repairable, cicuit board not harmed.

At 63 now I am no longer in the diy game.

Anyone interested kindly e mail me with any info you may need and additional pics.

My best to all

sorry to hear that;
to bad that I'm too far.....
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Old 2nd April 2006, 10:32 PM   #33
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All of these shippers of late are just getting brutal in the way they handle packages, then when something happens, they won't pay the claim.

However this is the first I have received from FedEx Ground in this condition.
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Old 2nd April 2006, 10:44 PM   #34
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Yeoldestereo.

Sorry for that damage. it's a pitty.

Did I undertood correctly that you will be selling the unit as is?

If so let me know
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Old 2nd April 2006, 10:47 PM   #35
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Yes will be sold as is. It is repairable for the duy guys or for parts.

Will be accepting offers and best offer gets it.

Ned
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Old 3rd April 2006, 08:51 AM   #36
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Default Re: Threshold NS10 Lineamp PCB

I found what I believe is really the original NS10 schematics, thanks to my brother-in-law, who had a folder with quite a lot of stuff!
If versions of the NS10 exists I do not know. Nelson probably will know!
I think this is basically identical to the one I posted some time ago, but that schematics was probably something I hand copied from this one now attached!

Rolv-Karsten



Quote:
Originally posted by apassgear
I decided to open yet another NS10 thread, this one is about building a lineamp as close as possible to the original thing with some update ideas.

This has been possible thanks to R-K (Rolv Karsten) who posted a schematic he kept for 27 years that appeared to be faithful to the original in words of Nelson Pass, besides that there were many other valuable contributions such as close up pictures of the naked boards (sans cans) of the line and RIAA PCB’s by Malotron and others. Thanks to all you great guys again.

My Take on Threshold NS10

The idea behind this layout might not be for everyone since I took some “non audiophile” route regarding input and output caps which are not MKP’s but had my reason to it. Laying film caps on the board crated an awful appearance and did not look neat and ended with a big PCB for each channel. So I decided to keep the original spirit and go with lytics and thought that today’s caps are way better than 25 or 30 years ago, so why not?... use some BG or Panasonic FC’s which are way better than the old ones and in some cases being preferred to film caps by some DIY’s. The only big film cap is at the rail decoupling.

Since I wanted short traces and a compact layout I also decided to use the smaller ½ W resistors with an over all length of 0.360” (9.15mm) so no Dales RD-55’s, though I know in some places on the layout it is possible to add longer lead resistor and could add some pads, but for the time being only short resistors are possible.

All 3 signal BJT are as close as possible and the overall signal path is as short as it gets with these type and size of components which was one of the premises I started with, so I expect that the overall performance of this layout be quite good.

The overall size of the PCB is 3.110 X 2.125” (79 X 54 mm) one sided and uses no jumpers so its easy to etch and build. Most of the traces are 0.035” (0.89 mm) smaller pads are 0.080” (2mm) really don’t know how difficult could be to etch this by oneself with the regular photocopy transfer process. Any ideas?

Related to the bias opamp I decided it should have double rails for best stability and this enable to use any type with standard pinout you may have at hand, rails then should be 18/15 +-V. It’s a single unit DIP so one on each channel as the Master did.

I will welcome all suggestions so please chip in to make this layout better.
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Old 3rd April 2006, 03:26 PM   #37
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Default Re: Re: Threshold NS10 Lineamp PCB

Quote:
Originally posted by R-K Rønningstad
I found what I believe is really the original NS10 schematics, thanks to my brother-in-law, who had a folder with quite a lot of stuff!
If versions of the NS10 exists I do not know. Nelson probably will know!
I think this is basically identical to the one I posted some time ago, but that schematics was probably something I hand copied from this one now attached!

Rolv-Karsten
R-K

Wow, thanks again, excellent contribution, Rolv. We now have both line and RIAA stages.

As you say, I guess the previous schematic (RIAA one) was drawn from this one taking in consideration the notes appearing on this schematic. So I would venture to say that both are correct.

So now we are headed to the real thing having all the values correct!!!!

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Old 3rd April 2006, 04:04 PM   #38
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For clarity I have redrawn the schematic which is a guide also for the PCB with numbered components.

I have also marked components with a “*” that are not part of the original design. These values, if used, should be tested for best performance.
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Old 3rd April 2006, 07:17 PM   #39
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Default Re: Re: Re: Threshold NS10 Lineamp PCB

Quote:
Originally posted by apassgear


R-K

Wow, thanks again, excellent contribution, Rolv. We now have both line and RIAA stages.

As you say, I guess the previous schematic (RIAA one) was drawn from this one taking in consideration the notes appearing on this schematic. So I would venture to say that both are correct.

So now we are headed to the real thing having all the values correct!!!!



My original hand copied drawing consists of two pages: RIAA and line stage. I am pretty sure I made this copies from the recently posted original. Due to no Xerox machine at the time. :-)
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Old 3rd April 2006, 07:19 PM   #40
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Quote:
Originally posted by apassgear
For clarity I have redrawn the schematic which is a guide also for the PCB with numbered components.

I have also marked components with a “*” that are not part of the original design. These values, if used, should be tested for best performance.


+/- 15 V for the opamp? I think the original's opamp runs off 0 and +24V. Or?

RK
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