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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Nytech CXA 252 amp
Also for the archives CXA252.
Very little on the www about this except someone else who seems to have been here before but no resolution. I wish to confirm this 1980 ? amp has not been tampered with before i power-up and repair. I have the schematics for the CTA 252 which is the tuner amp version and the CXA seems to be a slightly more powerful version (but no external heatsinks all active in totally enclosed metal case) of the output modules used in the CTA 252. So far so good . Now more that doesn't hang together -incredibly thick guage (electic cooker wire) used for power wiring inside but 2 pairs of outputs thin wire connected to crappy 2 pin din (low power) speaker sockets. THe legend on the outside says for use with ARC 'B' speakers. A pre-amp ? low power output ? daughter board is also marked ARC 'B' One output channel goes to parallel paired up 4mm banana sockets with one 2 pin Din socket labelled 'L. F OUTPUT' and the other channel to 'H. F OUTPUT' banana plus din , not left and right ouputs. Two pairs of outputs but 2 each paralleled together - what is this nonsense about ? . I don't think anyone has ever been inside this amp and rewired or repaired at any time since manufactured e-mail (removing .....) electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse Nigel,Diverse Devices,Southampton,England |
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Nytech CXA 252 amp
"Nigel Cook" wrote in message news Also for the archives CXA252. Very little on the www about this except someone else who seems to have been here before but no resolution. I wish to confirm this 1980 ? amp has not been tampered with before i power-up and repair. I have the schematics for the CTA 252 which is the tuner amp version and the CXA seems to be a slightly more powerful version (but no external heatsinks all active in totally enclosed metal case) of the output modules used in the CTA 252. So far so good . Now more that doesn't hang together -incredibly thick guage (electic cooker wire) used for power wiring inside but 2 pairs of outputs thin wire connected to crappy 2 pin din (low power) speaker sockets. THe legend on the outside says for use with ARC 'B' speakers. A pre-amp ? low power output ? daughter board is also marked ARC 'B' One output channel goes to parallel paired up 4mm banana sockets with one 2 pin Din socket labelled 'L. F OUTPUT' and the other channel to 'H. F OUTPUT' banana plus din , not left and right ouputs. Two pairs of outputs but 2 each paralleled together - what is this nonsense about ? . I don't think anyone has ever been inside this amp and rewired or repaired at any time since manufactured e-mail (removing .....) electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse Nigel,Diverse Devices,Southampton,England This must be the craziest amp i've ever come across. Fixed the relatively straightforward problems that could not influence the functioning described and could power up both parts. On its own the CTA with a preamp - amp bridge on the o/p & i/p 5 pin din works fine. On its own the CXA only seemed to work on left channel but connect CXA to CTA via the cross-over type 5 wire 5 pindin to 5 pin din then it does work The other channel goes and returns down this link it would seem ,part tracing the wiring. Unfortunately the owner has the speakers that go with this setup in another part of the country. But ,yes, stereo output of sorts (in mid range ) from the CXA all bass and mid from the pair of o/ps marked LF and treble and mid from the HF pair. Balance on the CTA is ineffective in this mode and volume very much at the bottom of the control. Anyone coming across a pair of ARC 'B' speakers will have a mystery on their hands as well. Weird or what ????? I think a post to a hifi nuts NG is in order e-mail (removing .....) electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse Nigel,Diverse Devices,Southampton,England |
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