In case no one here has it, check:
http://nanaimo.ark.com/~pat/tube.htm
Look at the bottom of the page to see "How It Works"
/Hugo
http://nanaimo.ark.com/~pat/tube.htm
Look at the bottom of the page to see "How It Works"
/Hugo
Parts list?
Most of the parts of the SP-11 are called out, but the JFETs and MOSFETs are not.
Does anyone know what they are?
Most of the parts of the SP-11 are called out, but the JFETs and MOSFETs are not.
Does anyone know what they are?
It is the politic of ARC to match and color code their j- and mosfets. Nobody knows what it is.
Reinhard
Reinhard
I haven't looked at the ARC SP-11 schematic yet, but my answer to the question is: not terribly critical!
The FETs need to be low noise if they are in the front end of the phono stage...
Beyond that all you need to look at is the IDSS which you can figure out from the rest of the circutry around them - if it matters at all...
The Mosfets and the Fets need to be able to handle the voltage drop across them, so they can be selected on that basis, and on the basis of the power they are dissipating where they are in the circuit... the bias set up for the Mosfets will give the clues needed to determine which ones will work in the circut as shown, although you can always dork some values to match another mfrs devices... there are only a handful of mfrs that made small mosfets in the 80s and 90s... 😀
_-_-bear
The FETs need to be low noise if they are in the front end of the phono stage...
Beyond that all you need to look at is the IDSS which you can figure out from the rest of the circutry around them - if it matters at all...
The Mosfets and the Fets need to be able to handle the voltage drop across them, so they can be selected on that basis, and on the basis of the power they are dissipating where they are in the circuit... the bias set up for the Mosfets will give the clues needed to determine which ones will work in the circut as shown, although you can always dork some values to match another mfrs devices... there are only a handful of mfrs that made small mosfets in the 80s and 90s... 😀
_-_-bear
Anyone got an ORCAD reader???
I can't open those nice files from the italian site...
Whaaaaa!
Tried getting something out of their site - no response through their "free download bot"... Grrrr...
would be nice to see that stuff in .pdf
anyone??
_-_-bear
PS. I'll post it on my site if someone can transfer it to .pdfs!
I can't open those nice files from the italian site...
Whaaaaa!
Tried getting something out of their site - no response through their "free download bot"... Grrrr...
would be nice to see that stuff in .pdf
anyone??
_-_-bear
PS. I'll post it on my site if someone can transfer it to .pdfs!
The schematic is also on the Audio Research Database -- ARCDB - SP-11 -- the other link appears broken.
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