Threshold NS10 Lineamp PCB

[Malotron]

Here are the gain modules, Line and MM RIAA (have the relays). For low output MC carts there was the M1 module. This one'
s voltage reads as 0, +20v regulated.

That 400a needs a lot of R&R - send it on a boat to me🙂

 

[R-K Rønningstad]

Is this the original wiring? My NS10 has more loosely twisting of the ground and signal to the RCA sockets.
Could you please take a detailled photograph of the wiring around the mono/stereo switch in case I would like to have that functional again?

RK

 

[Malotron]

Doodle🙂

 

[R-K Rønningstad]

Thank you very much !

 

[labjr]

Did you use an Etch-A-Sketch for that!

 

[Malotron]

This is the old b/w version 😉

 

[VintageAmp]

Missing chip thanks

Thanks Malotron, I shall try the LM723 When I locate one. This baby is going to come back to life soon.

 

[mpmarino]

hehe BUMP!

Boy, been a while since i thought about this stuff....

It looks like this thread morphed mostly into a PSU discussion - with few impressions of the actual original style NS-10 clone as designed here.

I'm looking for a 'lightweight' discrete linestage to integrate into a project, and this PASS pre looks ideal. I like the RIAA option as well!

If you actually built this as re-designed here....

How did it all work out? Any odd issues? Sound? (loaded question there 🙂 )

Thanks all!

Apass - YGM, in a minute.

 

[mpmarino]

I doubt the NS10 is lost in history 🙄

No matter - for me it's in my future

Regarding the 47uf cap at the output...

Seems to me this can be a 10 or 20uf film cap with no ill effect (?).

Please correct me if I'm wrong (likely 😉 )

 

[R-K Rønningstad]

Should be good, or you could parallell two 22uF or five 10uF or something.

 

[Zen Mod]

or you can make iteration with bipolar PSU and get rid of it

 

[mpmarino]

Should be good, or you could parallell two 22uF or five 10uF or something.

Thanks R-K,

I am trying to understand why such a large value was chosen. Was the goal to 'fold over' just above DC?

I'm probably missing an important aspect of what's happening.

 

[mpmarino]

or you can make iteration with bipolar PSU and get rid of it

Oh boy, there you go again, complicating things for me

Seriously, I want to make one like the original - maybe just a little different. Russ' thread has everything one needs to make a bipolar NS-XY. I am sure that one is great.

 

[Zen Mod]

dunno - we made that one ( with Shinyy, if I remember correctly) eons ago

on Baby DiyA , or maybe some FiFi forum (DIY section) where we were prior to Baby DiyA

 

[R-K Rønningstad]

Quick (and dirty) calculations informs -3dB @ 0.07Hz (assumed power amp input impedance of 47 kOhms).
4.7 uF would probably work like a charm.

 

[Zen Mod]

as lately from Mighty Pa -10uF Elna Silmic

then , as from Mighty ZM - bypassed with 1uF MKC

 

[mpmarino]

R-K, thank you for confirming that.


Reaallly? CHOOSE to use EL ?

better to just a 10uf poly thing, no?
MKP ish box or tube?

huh

 

[brianco]

Are there any boards available anywhere for this great preamp?

[I had an original and have always regretted selling it!]

 

[maouna]

Hello. I am thinking of building 2 channels of the basic version of NS-10 with regulated 30V Power supply and my question is should i use seperate psu for each channel or a single psu for both channels?will this have any impact on sound or crosstalk?

 

[Zen Mod]

if any , difference will be tiny