OK Marc, fine but to mine opinion you could left fuses on previous PCB positions, it looked nicer before, just to perform a little copper connections adaptation. To have PCB in max symmetrical look you could also move single wire jumper to the middle position, otherwise very neat to the eye. 😉
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Hello Nico, nice to see you again. I always like to see way of clarifying things of oldschools.
By the way, it bothers me a bit to see fuse holders on those pcbs. As I mentioned before, pcbs should be without power unit on board in my opinion. This is a very early stage of an implementation and people may use just one PS unit for each pcb/circuit experimentation.
Cheers.
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Yes, just aesthetetical. 🙂
Leave the fuses on previous physical positions and wire them like it is on your last schematic, it would take only a split second of your time, regards Andrej.
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People who design PCB's on their own usually make them functional to their exact needs-wishes, I don't see any reason why not. To have PSU on PCB also means less wires (spaghetti) present in an amp's case. In according to high speed design like SSA is, where all AC paths are concluded in a very short loop, it makes a lot of sense too. Please look how high speed amps like Spectral are built (PCB, heatsink, etc.). 😎
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one question from rather lazy, can I put FQP4N20/FQP7P06 or FQP4n20/IRF9610 which I have in stock or go to the shop for IRF610? Thanks
As an adept of curent feedback for audio from 20years, now, (i run a Mak Alexander like amp) i'm happy to see this project.
Definitively, i think current feedback makes the best sounding low IM amps or preamps.
I have some questions about this design.
Why don't you use a Fet input Op amp to get rid of thermal/appairement of the input devices ?
For the versions with transistor for thermal compensation/quiescent current, why not use a FET instead of NPN (problems of stability with NPNs in such stages on edges of positive signals).
Did somebody knows this design, not so far from SSA and yet available as a kit:
http://www.ebay.co.uk/itm/2-X-DELUXE...item230a47af0e
(If somebody can make a simulation, i would really like to read the results)
Definitively, i think current feedback makes the best sounding low IM amps or preamps.
I have some questions about this design.
Why don't you use a Fet input Op amp to get rid of thermal/appairement of the input devices ?
For the versions with transistor for thermal compensation/quiescent current, why not use a FET instead of NPN (problems of stability with NPNs in such stages on edges of positive signals).
Did somebody knows this design, not so far from SSA and yet available as a kit:
http://www.ebay.co.uk/itm/2-X-DELUXE...item230a47af0e
(If somebody can make a simulation, i would really like to read the results)
Nico,
I am on two configurations :
- First that i will begin soon : Lasy Cat BIGBT
- Second : Classique BJT configuration. The goal is 3 ou 4 output pair and +/-50V rail. Normaly a friend of mine will help me for taht job. I'am not enough strong to do that alone.
Marc
I am on two configurations :
- First that i will begin soon : Lasy Cat BIGBT
- Second : Classique BJT configuration. The goal is 3 ou 4 output pair and +/-50V rail. Normaly a friend of mine will help me for taht job. I'am not enough strong to do that alone.
Marc
Hi Nico
I think there will be some SSA versions pop-up soon, PCB's were presented, so it is only a question of time when they'll appear. After sonics confirmations of our's claims there will be still some more ...
Nico It would be also very nice to put some pic of yours SSA ... please, I'm very curious.
Because than it would be just another copy of the Fets. 😀
Because there is no instability issue noticed whatsoever. 😎
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