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Old 11th October 2005, 08:50 AM   #1
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Default 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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Old 11th October 2005, 09:00 AM   #2
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Here's the insides.
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Old 10th January 2011, 08:14 PM   #3
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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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Old 10th January 2011, 08:47 PM   #4
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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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Old 29th January 2011, 11:04 PM   #5
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Quote:
Originally Posted by sakis View Post
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
Quote:
Originally Posted by sakis View Post
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
Hi sakis,

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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Old 30th January 2011, 02:49 PM   #6
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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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Old 3rd June 2011, 05:10 AM   #7
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sir,please mail me the whole circuit diagram yamaha CA700 as soon as possible.
thanking u,
Pramod.
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