Top ten ways to a better Aleph?

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#121
rchua77 said:
i dont think resistors make a difference in this particular application. Standard carbon film or 1% metal film would work as well and cost less than Dale or Holco.

The gate is the leg of the FET which isnt labelled D or S and is connected to the resistor.

Hope this helps. Regards
Click to expand...

Hummm.... My question was one of sarcasm actually.

Regards

Anthony
 
#126
KevinLee said:



Hello,

What is the location of the applicable zener on the Aleph 30 (Volksamp )PCB)?

I am assuming the cap across zener is non polar?

Thanks

Kevinlee
Click to expand...


1) Wich PCB do you mean? On the schematic it is Z5, the 9,1V Zener near Q3 (top left).
2) If you use a Film cap, yes it is "non polar"
Manuel
 
#129
Hello again,

Another question,

I believe all the 0.47 ohm resistors in my Aleph 30 are Panasonic metal oxide film.

Would there be an advantage to switching all of these to Mills MRA-5 ?. The tolerances seem to be better with these.

Has anyone used wire wound 3 watts in their Aleph 3/30? If so, how did you like the sound?

Thanks

Kevin
 
#130
Hi,

> I believe all the 0.47 ohm resistors in my Aleph 30 are Panasonic metal oxide film.

Yes. I use this brand too.

> Would there be an advantage to switching all of these to Mills MRA-5 ?. The tolerances seem to be better with these.

If you need more value-accurracy, you can put 3 x 1,5 Ohm 1w MOX res in parallel instead of 1x 0R47 3 W, so the tolerance will be spread over more devices.
For the sound of the mills : I don't know.


Manuel
 
#132
Thanks Grey,

I will leave the Panasonics alone for now.

Maybe you can advise on this:

There are (2) small ceramic caps in the Aleph 30 (10pf and 1000pf, C8 and C7). Would changing these to silver mica be an improvement or would I be degrading the sound?

I have 11pf silver mica to replace the 10pf ceramic and I would parallel a 730pf silver mica and a 270pf silver mica to make the 1000pf to replace the 1000pf ceramic.

Thanks

Kevin
 
#133
Who says they're ceramic? Granted, I haven't seen a production Aleph 30, but I find it difficult to believe that Nelson would use a ceramic in any position in the audio circuit.
About the only places I would use a ceramic cap would be high-frequency suppression in the bridge rectifier and spark suppression at the power switch.
Silver-mica are fine.

Grey
 
#134
GRollins said:
Quoted specs aside, I believe that you'll find the blue Panasonic resistors to be far tighter than the rated 5% tolerance.

Grey
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Grey,
Yes and thats why the panasonic are fine to me. And Nelson uses them in his products and so it fills me with pride to put them in in my Aleph plagiarism (show off).
But paralleling resistors reduce their inductivity. And it brings me to a question : is inductivity of the source resistors an issue for the circuit? Is it good to try to avoid/reduce it?
I recall having heard about this matter but nothing substancial.


thx
manuel
 
#135
Hello.
I'm going to build an Aleph 30, and want it to sound real good. You guys seem to measure the **** out of the transistors. Is there anyone that can take that job for me for some money?

I have BrianGT's board. I noticed that the space left for the resistors is about three atoms. Is there any quality resistors that can actually fit? Or do only the 3w have effect on the sound?

I have another thread on heatsinks, but do anyone here have any advices on some huge sinks that can take full bias on the a30? How big do they have to be?

Thanks

Ese
 
#138
True, i'm in grouch mode.(including typo-mania)

Fixating on ladida stuff, but at the same time skipping part of P's 10 commandments (minus the red acid in a brown paper bag) makes for tiresome reading.
Do not concentrate on areas where a diy has the edge but finger through catalogues for shiny stuff, as fatigueing as the fashion industry.
 
#139
GRollins said:
Quoted specs aside, I believe that you'll find the blue Panasonic resistors to be far tighter than the rated 5% tolerance.
Grey
Click to expand...

I once tested a batch, and they matched each other to about
.1%

KevinLee said:
There are (2) small ceramic caps in the Aleph 30 (10pf and 1000pf, C8 and C7). Would changing these to silver mica be an improvement or would I be degrading the sound?

I have 11pf silver mica to replace the 10pf ceramic and I would parallel a 730pf silver mica and a 270pf silver mica to make the 1000pf to replace the 1000pf ceramic.
Click to expand...

No doubt that silver micas are the best, but getting them is
difficult, and there's not much to substantiate audibly better
performance at these values and frequencies.

What I would like to see is some nice 10 uF silver micas, and
a forklift to move them...

😎
 
#140
Nelson Pass said:


I once tested a batch, and they matched each other to about
.1%



No doubt that silver micas are the best, but getting them is
difficult, and there's not much to substantiate audibly better
performance at these values and frequencies.

What I would like to see is some nice 10 uF silver micas, and
a forklift to move them...

😎
Click to expand...


I agree with Nelson on the Panasonic resistors. I once ran through twenty or thirty of them, finding no significant variation. I figured I had better ways to spend my time and went on to the next thing.
Silver mica caps? Mouser.
No. Sorry. They stock neither 10uF, nor the forklift...

Grey
 
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