Gentlemen,
while recapping my old Nytech Amps CPA602's we decided to bring the Amps to the state of the art from today. I already started to design an new housing pink fish media - View Single Post - Recapping of Nytech CPA 602 and to design a new PSU board.
Any further Tips and suggestions how to improve the old Nytech in the ghost of Mr. Hay are warmly welcome ...
The idea is, to design mono-blocks based on the nytech Amp.
Help is appreciated
while recapping my old Nytech Amps CPA602's we decided to bring the Amps to the state of the art from today. I already started to design an new housing pink fish media - View Single Post - Recapping of Nytech CPA 602 and to design a new PSU board.
Any further Tips and suggestions how to improve the old Nytech in the ghost of Mr. Hay are warmly welcome ...
The idea is, to design mono-blocks based on the nytech Amp.
Help is appreciated
I have the schematics for the 602 in the latest design with the tumb Reduktion circut and I have the schematics of the 252. The "S"-Edition I dont have ...
Would be wunderfull If you can scan the ION's it and pm it to me ...
Grüße aus dem Ruhrgebiet
There are some news....
The housing prototypes are available .....
http://i.imgur.com/pdQIc.jpg?1
http://i.imgur.com/rcxTR.jpg?1
The housing prototypes are available .....
http://i.imgur.com/pdQIc.jpg?1
http://i.imgur.com/rcxTR.jpg?1
Gentlemen .....
Some steps are already done and I'm very interested in your feedback, comments and your further ideas ....
I designed new housings for the new CPA 602-2012.
There is also a new designed PSU PCB:
The PSU PCB will fit also in the original CPA602 housing. I have three of them and all will get a new PSU-PCB with two 120VA 58V Toroids. They have a diameter of 92mm and will fit into the original housing. Then I have CPA 602's in complete Mono-Design
And the Block Layout for the new housings is also available:
The idea is now, to prepare new PA-Boards which can be used also in the original 602 and my new housing.
Before I do this, I want to optimize the circuits. The original one I transfered into Eagle. Here are the orginal schematics. Please look for failures ...I'm sure there are some ....
Things I discussed with alohka and already changed are:
Ceramic Cap's: All ceramic caps were changed to Foil and Styroflex. I used WIMA FKP's with 1% and Vishay Roederstein MKP's 1%.
Cap #5 was changed to 470µF. This is the value the later Ion Obelisk had for this cap ....
Output Caps: I have already 4700µF 63V Axial Caps in my 602's. My idea is to implement an option into the PCB to use 5 Radial cap's instead of the orginal axial. What I found so far are Nichicon FW 2200 µF 63V. Maybe there are better one .... This will only work in the new housings; enough place will be available. Maybe this will work also in the original housing ... the 2200µF have a diameter of 18mm and a high of 35 mm .... I have to find out.
This are the Cap's I want to use:
I replaced also the both Piher with Trimmer from Vishay:
VR1 - 100k: Vishay Trimpot T93 YA - 100k
VR2 - 220: Vishay Trimpot T93 YA - 220
This is what I did so far. The schematics are transfered and nex step is the routing. Before this, your ideas to improve the logic and the components are warmly welcome ...
Regards from Germany
Some steps are already done and I'm very interested in your feedback, comments and your further ideas ....
I designed new housings for the new CPA 602-2012.
There is also a new designed PSU PCB:
The PSU PCB will fit also in the original CPA602 housing. I have three of them and all will get a new PSU-PCB with two 120VA 58V Toroids. They have a diameter of 92mm and will fit into the original housing. Then I have CPA 602's in complete Mono-Design
And the Block Layout for the new housings is also available:
The idea is now, to prepare new PA-Boards which can be used also in the original 602 and my new housing.
Before I do this, I want to optimize the circuits. The original one I transfered into Eagle. Here are the orginal schematics. Please look for failures ...I'm sure there are some ....
Things I discussed with alohka and already changed are:
Ceramic Cap's: All ceramic caps were changed to Foil and Styroflex. I used WIMA FKP's with 1% and Vishay Roederstein MKP's 1%.
Cap #5 was changed to 470µF. This is the value the later Ion Obelisk had for this cap ....
Output Caps: I have already 4700µF 63V Axial Caps in my 602's. My idea is to implement an option into the PCB to use 5 Radial cap's instead of the orginal axial. What I found so far are Nichicon FW 2200 µF 63V. Maybe there are better one .... This will only work in the new housings; enough place will be available. Maybe this will work also in the original housing ... the 2200µF have a diameter of 18mm and a high of 35 mm .... I have to find out.
This are the Cap's I want to use:
I replaced also the both Piher with Trimmer from Vishay:
VR1 - 100k: Vishay Trimpot T93 YA - 100k
VR2 - 220: Vishay Trimpot T93 YA - 220
This is what I did so far. The schematics are transfered and nex step is the routing. Before this, your ideas to improve the logic and the components are warmly welcome ...
Regards from Germany
A very nice project (and a very rare restauration project too)! I'd love to hear the results at one stage...
Usually 2200yF is enough for a reasonable corner frequency. The ION Nexus and the bigger Obelisk 3X used 10000yF instead, as did Nelson Pass with several of the Zen Amps, but I was never sure if this was a real necessity. I would rather recommend a reasonable combination between psu caps and output caps. That could be about 10000yF on the psu and 4700yF at the output.
And: A somewhat tailored corner frequency could probably help to get even more bass out of the speakers (f.e. with certain closed box designs and some smaller bassreflex speakers). It therefore makes sense to adjust the value of the output caps to the speakers.
How will you drive your amps (preamp/crossover)?
Usually 2200yF is enough for a reasonable corner frequency. The ION Nexus and the bigger Obelisk 3X used 10000yF instead, as did Nelson Pass with several of the Zen Amps, but I was never sure if this was a real necessity. I would rather recommend a reasonable combination between psu caps and output caps. That could be about 10000yF on the psu and 4700yF at the output.
And: A somewhat tailored corner frequency could probably help to get even more bass out of the speakers (f.e. with certain closed box designs and some smaller bassreflex speakers). It therefore makes sense to adjust the value of the output caps to the speakers.
How will you drive your amps (preamp/crossover)?
VISHAY 2200/63V axial
Aluminium Kondensator 85C 63V 2200uF Vishay MAL202118222E3
or
PANASONIC radial
Aluminium Al Elek.-Kondens. NHG rad. 2200uF 63Vdc Panasonic ECA1JHG222
there are many possibilities.
As far as I remember ION have used Nichicon elcaps.
Aluminium Kondensator 85C 63V 2200uF Vishay MAL202118222E3
or
PANASONIC radial
Aluminium Al Elek.-Kondens. NHG rad. 2200uF 63Vdc Panasonic ECA1JHG222
there are many possibilities.
As far as I remember ION have used Nichicon elcaps.
I have a Nytech CP112 as a PreAmp, followed by an active Crossover out of my old CXA252 which will serve two CPA 602's.
The 602's are driving my ARC 050's.
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On my new Dual Rail Powwer Supply I will have 9400µF for each Channel - 18.800µF for both. Does this mean that ~10000µF by channel on the PA board is ok? Even considering whether it is a real necessity
Why not.
Did you make a new case for the crossover and how did you power it?
No .... I have the intention to do it ... the new housings look really nice
I used the old housing and the old PSU. But I replaced the both cap's on the existing PSU board by 5 1000µF 63V Nichicon FG each.
On the XOver I replaced also the 10µF Rubycon Non Polars by ELNA Silmic II 10µF 50V. I tried also Nichicon ES BiPolars but I did not like it ....
Here they are ..... (little bit unsharp, from my iPhone ...)
I have a CA252 housing with Toroid available. Maybe I can use it to improve the CP112.
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Yes, there are several serious problems with the schematic. It is strange nobody has commented yet. I presume you found the errors some time ago as the labelling of connections is wrong with 0V to the positive rail, -80V only to the VAS positive, no supply to the output 0V rail, just speaker return. There is no power (conventionally) at all to the input stage!
Perhaps you can correct that before considering a PCB or modifications to the original.
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