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11th October 2005, 07:50 AM
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#1 |
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diyAudio Member
Join Date: Jan 2002
Location: Sydney/Australia
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Yamaha - Natural Sound System - Model CA-700
Hi all,
I have an old Yamaha amp which I was about to gut and install a chimpamp into when I thought, maybe there is someone out there that would appreciate this old amp the way it is.  It actually works. There is a problem with some of the switches, and it sounds, well.... bad, maybe very bad. It looks like the amp modules have been repaired in the past. I can't recognise any of the transistors but it looks like a quasi topology using T0-3s. Anyway, is there anyone that collects old Yamahas,  otherwise I'll get the cutters out.Thanks
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Greg Erskine |
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11th October 2005, 08:00 AM
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#2 |
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diyAudio Member
Join Date: Jan 2002
Location: Sydney/Australia
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Here's the insides.
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Greg Erskine |
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10th January 2011, 07:14 PM
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#3 |
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diyAudio Member
Join Date: Jan 2006
Location: nea makri athens greece
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i know its ages ago Greg and i presume that ou allready trushed this amp but is there a chance that you have a schematic ????
I got one to repair schematic is not to be found and the funny thing is that in the midle there is a pcb i think including thyristors on it and tully never seen that before .. any help will be a bless
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr |
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10th January 2011, 07:47 PM
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#4 |
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diyAudio Member
Join Date: Jan 2006
Location: nea makri athens greece
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shame on me ....i repair 200 amps a year and got stucked on this one ... but only for a few minutes...
its not thyristors its triacs with small thyristors ...the all circuit is just a crowbar ... piece of cake .... got all the rest figered out amp is happily working thanks though
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr |
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29th January 2011, 10:04 PM
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#5 | ||
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diyAudio Member
Join Date: Jan 2002
Location: Sydney/Australia
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Quote:
Quote:
Sorry I missed your posts, I wasn't being rude. I am glad you got it sorted. BTW: It's still sitting in a cupboard somewhere.  regards
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Greg Erskine |
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30th January 2011, 01:49 PM
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#6 |
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diyAudio Member
Join Date: Apr 2010
Location: Coffs Harbour, on the east coast
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Hmm...it looks pretty cool, Greg. How about a couple of BAKSAs in your favourite colours and a new PSU inside? Noisy pots can sometimes be replaced and swtches cleaned and adjusted to work quietly. Retro garage amp?
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regards |
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