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intense-tavda 11th January 2006 06:10 PM

threshold sl10
 
Hi There!

I got me a threshold sl10. It sounds great. better as the modified AVM. Instead of building me a P1.7, maybe I will do that later on.

Now I have several questions. The power supply caps are looking allright to me and also the caps on the pre-pcb are looking allright.

In the PS there are Mallory 4700 uf 60VDC and in the pre there are Instrument devices C221-4713 and 4705. What's the value of them?

There are also 2 red silver mica caps 50PF, I think, one in each channel, are getting a little black inside. Are they no good anymore?

And again the caps are looking good, but that does not mean they will be allright, is it?

But again the sound is very good, I've never heard anything better in my set. Maybe upgrading will made it better.
Who can help me? Thanks allready! Greetings Teake.

Nelson Pass 11th January 2006 09:03 PM

I think the electrolytics were 470 uF at 25V or so.

The Micas should last forever, so I wouldn't worry about them.

audiotux 11th January 2006 09:12 PM

Hi Teake ,
nice to hear that the Treshold sound better than that German Pre ,
no wonder for me , i had the same expirience years ago !

Greetings from Germany

Jürgen

intense-tavda 11th January 2006 10:28 PM

Thanks Nelson and Jurgen.
Are the 470uF/25V the bigger ones, and the smaller ones, what value do they have Nelson?
Thanks allready. Teake.

intense-tavda 11th January 2006 10:34 PM

Again, and there is a quad opamp in it, can I replace that too, or does it not matter, and if I should, is there a newer one on the market? Its the RC4136N. Grtz Teake.

Zen Mod 11th January 2006 11:38 PM

Quote:

Originally posted by intense-tavda
Again, and there is a quad opamp in it, can I replace that too, or does it not matter, and if I should, is there a newer one on the market? Its the RC4136N. Grtz Teake.

http://www.passlabs.com/np/SL10%20SCH.tif



if you didn't see that already

this is servo,I presume;

probably old OP is good enough for purpose

Zen Mod 11th January 2006 11:44 PM

besides,you can gain more if you replace that 78 and 79 regs with something better; LM317 and LM337 at least,with some PSU layout rearranging

Zen Mod 11th January 2006 11:48 PM

question for Master :

in your (humble ;) ) opinion-which one is better sounding:NS10 or SL10 ?

both are soooo wonderfully simple.......

as you can see-we already trance with NS10.........

or I should post this in full range forum ........ :clown:

intense-tavda 11th January 2006 11:50 PM

He Choky!
Thanks, you mean replacing the op with lm 317/337 and take a bigger elco buffering. I saw the drawing but can't see the numbers. Maybe you can? Grtz Teake

Zen Mod 11th January 2006 11:57 PM

Quote:

Originally posted by intense-tavda
He Choky!
Thanks, you mean replacing the op with lm 317/337 and take a bigger elco buffering. I saw the drawing but can't see the numbers. Maybe you can? Grtz Teake


nope;
not replacing OP with LMs

OP is operational amplifier ,used there in each stage (4 times-two in phono section and two in line section ) for servo (bringing output to DC null) purpose.

LM317 is positive and LM337 is negative reg 3-legged chips,and I meant that you use them instead 7815 and 7915, respectively


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