Goldpoint SA4M-47 passive 'preamp' winging its way to Marco Towers...

Quote:

---

Originally Posted by Marco

Hi Sam,

They were left long simply for testing, in case I wanted to sell any of the 'losing' resistors on :)

---

You're no fun, just spilling the beans like that :rolleyes:

Lol - the poor lad was obviously tired! ;)

Marco.

With his heart bleeding all over the place elsewhere on the forum?
I thought the distraction of hunting for something might help :eyebrows:

Quote:

---

Originally Posted by Marco

Lol - the poor lad was obviously tired! ;)

Marco.

---

here was me thinking I was gettin' the "Z's" too :D ....Glad its worked out; its always nice when a plan comes together

Indeed... Shows that it pays to be thorough! :exactly:

Marco.

Quote:

---

Originally Posted by Marco

That's totally gone now, leaving me with a truly superb wide-open sound - the best I've heard the Goldpoint sounding yet... So, in the final analysis, the Z-Foils won!
Marco.

---

Told you so! :ner:
I haven't checked Texas Components site to see if they are different from their own Z-foils, which is what I use. You can play with that idea, if you want.
BTW, non inductive wire-wound resistors can exhibit some of the lowest Johnson noise, so I wonder if they would work here. A bit big though!

Quote:

---

Originally Posted by Light Dependant Resistor

More or very problematic grounding, needs further methods of isolation, and
to the rescue are loop breaker circuits. http://sound.westhost.com/earthing.htm

Cheers / Chris

---

Keep up Chris, I've just explained all that to the technically challenged*! :lol:
On the bench I have temporarily disconnected the mains earth to isolate a hum problem once or twice, but that is SO dangerous in general use. Do not try this at home, kids.
* That is, even more than I am!

Quote:

---

Originally Posted by awkwardbydesign

Told you so! :ner:
I haven't checked Texas Components site to see if they are different from their own Z-foils, which is what I use. You can play with that idea, if you want.
BTW, non inductive wire-wound resistors can exhibit some of the lowest Johnson noise, so I wonder if they would work here. A bit big though!

---

Just to get slightly real here for a moment, I will quote Wiki, it says it best

"Thermal noise is intrinsic to all resistors and is not a sign of poor design or manufacture, although resistors may also have excess noise."

Wire wound resistors may have lower other noise, but Johnson noise is only dependent on the resistance not the construction.

I would not worry overly over resistor noise in a line level passive. The 100k resistor at the front of the power amp will be generating more noise than the preamp resistors.

Quote:

---

Originally Posted by lurcher

Just to get slightly real here for a moment, I will quote Wiki, it says it best

"Thermal noise is intrinsic to all resistors and is not a sign of poor design or manufacture, although resistors may also have excess noise."

Wire wound resistors may have lower other noise, but Johnson noise is only dependent on the resistance not the construction.

I would not worry overly over resistor noise in a line level passive. The 100k resistor at the front of the power amp will be generating more noise than the preamp resistors.

---

One of the problems with quoting Wikipedia is that it often generalises and is not thoroughly checked. I was referring to manufacturers' specs.
Thermal noise probably isn't a problem at these levels, but then the idea that resistors sound different is - resisted! :D

Quote:

---

Originally Posted by awkwardbydesign

but then the idea that resistors sound differentt is - resisted!

---

Oh, they most certainly do!

However, let's not lose sight of the fact that the best resistor is NO resistor. Therefore, the 'best' one, in that respect, is the one that 'sounds' as if it's not there! ;)

For me, the Z-Foils do that 'disappearing' trick better than the others I've heard.

Marco.