Pearl Two

[pchw]

Will this work:
- print the B1 order form
- white out the B1 info
- hand write the Pearl 2 info and $$ amount ($100 per set)
- your info
- fax it over

 

[Nelson Pass]

I think it would work.

 

[acidbrain]

- So the boards do have the same size + mounting holes as the classic Pearl 1?
- Can we see the boards / BOM / final schematics ?

 

[johnsonad]

They are posted and available. Better get your order in quick

 

[chrismercurio]

for Wayne and Papa,

When does the article go up?

thanks,

 

[Russellc]

I just called and ordered by credit card! Wa Hoo!

Russellc

 

[homme_de_terre]

I placed my order this morning.
All I can say for now is: Bye bye tube amp!

 

[gotoma8]

Just placed mine as well!
T

 

[metalman]

My order is in!

Woo Hoo!

 

[Melon Head]

Yes when does the article go up?

 

[Melon Head]

Just looking at the four 2sk370's in parrallel at the input.
Does this lower distortion?
Or is it to run the input stage at higher bias levels?
Why do you need 4?

 

[massimo]

Why do you need 4?

Lower noise.
Read original Pearl artcle: front end is very similar if not the same

 

[Melon Head]

I am not sure I understand?
Based on my logic (which I am starting to question these days), I would have thought 4 would give you more noise, because your dividing the signal by 4 across the devices, while the noise of each device is the same.
So the signal to noise ratio has reduced by 4.
I know I am most definitely wrong here, I just want to explain what I am thinking.

Hope you can explain this.

 

[massimo]

Lower noise (6 dB) and even higher gain.
Again: read the original Pearl article.

 

[gotoma8]

read the article and it would seem that 4 stages are better than two..
also, is the article on the Pass DIY Site, for the Pearl, valid for the Pearl 2? What's the difference, if any? Thanks
T

 

[Melon Head]

Lower noise (6 dB) and even higher gain.

But that doesn't really answer my question. I believe it, I just don't understand why
Is that lower noise for the complete preamp, or lower noise for the input stage?

Where do I find the original article?

 

[massimo]

Gotoma8, not 4 stages (the whole phono has 2 SE stages only), but 4 cascoded critters in parallel in the front end.
AFAIK Pearl and Pearl 2 are sharing the same topology in the front end (some value might differ) while the new circuit has a different output stage (2nd stage)

 

[chrismercurio]

http://passdiy.com/pdf/pearlphono.pdf

 

[gotoma8]

Gotoma8, not 4 stages (the whole phono has 2 SE stages only), but 4 cascoded critters in parallel in the front end.
AFAIK Pearl and Pearl 2 are sharing the same topology in the front end (some value might differ) while the new circuit has a different output stage (2nd stage)

Thanks for the clarification.
I had just ordered a set of the XONO Boards from Anadigit, they have not arrived yet, but hope that they will be good as i hear good things. The Pearl 2 is the next project after the XONO. Is the part's list on the article for the Pearl valid? I asked Sherilyn at Pass about the parts list, and she wasn't sure. She's going to ask Wayne to find out where we can get the parts list for the P2.

t

 

[jacco vermeulen]

while the noise of each

Hey dude, give me a little privacy in the John's, i don't want your Johnson so close to my Johnson.