Yamaha A-6a schematic needed

sesebe · 7th June 2011, 11:13 AM

Hello,

Can somebody help me with a schematic for Yamaha A-6a power amplifier?

Thank you

sesebe · 14th June 2011, 06:38 AM

Although no one knows this scheme?
Do not believe it that.

sesebe · 30th July 2011, 01:32 AM

Anybody?

Tekko · 30th July 2011, 01:59 AM

If no answer after a week, just let the thread die, instead of reposting "anyone?" every few days.

sesebe · 16th May 2012, 01:01 PM

Hi,

The A6-A model it is the name of Japanese model, for Europa the name for the same model, except power supply, is A760II and A760 it is the name for A6 model. Between A6-A and A6 (or european names A760II and A760) there are a lot of diferences and the schematics are quite diferent.

I ask you again if somebody have the schematic for Yamaha A6-A or european version A760II.

Thank you

Nanook · 16th May 2012, 01:23 PM

If a power supply problem I can help. The A-760 has the same power supply as the A-960 (so sez a hand written note on an A-960 service manual I have). If that would help I can take a photo of the schematic (sorry,no scanner).

jony · 16th May 2012, 01:29 PM

Here you can find a lot of free service manuals
Yamaha manuals, schematics and brochures - Hifi Manuals

c2cthomas · 16th May 2012, 01:39 PM

I can get a service manual for the A760 - but no luck for an A6 - still looking for a manual on the 760 II

But here is some important safety information from Yamaha about that series of amps. Safety Information Yamaha amplifiers (1980-1982) - Yamaha - Other European Countries

sesebe · 16th May 2012, 06:07 PM

Hi,

Thanks for replay.

I have the schematic for A760, A960, A960II and A1060, some M series and B6.
I think that the only schematic that I do not have is for A6-A (european A760II). This model I have at home.
I already made the transformer at a local supplier but I do not know the values of voltage and I think that I made to high voltage (original transformer was shorted). Now it is working beautiful but some stages from final amplifier work to hot (some current source and voltage suppliers for input stages I think).
I want to update the schematic to increase the efficiency and to reduce the working temperature.

Nanook · 16th May 2012, 10:46 PM

use the same power supply, so it follows that the European versions would be the same.

My first try at audio included some Wharfedale Delta speakers, Yamaha A-420 amp and a Dual direct load cassette deck. It still brings back fond memories

7th June 2011, 11:13 AM	#1
sesebe diyAudio Member Join Date: Jan 2011 Location: Iasi	Yamaha A-6a schematic needed Hello, Can somebody help me with a schematic for Yamaha A-6a power amplifier? Thank you

30th July 2011, 01:59 AM	#4
Tekko diyAudio Member Join Date: Jan 2005	If no answer after a week, just let the thread die, instead of reposting "anyone?" every few days. __________________ The point of life is to build atleast one audio amplifier before you die.

16th May 2012, 01:23 PM	#6
Nanook diyAudio Member Join Date: Feb 2004 Location: Chinook Country.Alberta	What specifically do you need? If a power supply problem I can help. The A-760 has the same power supply as the A-960 (so sez a hand written note on an A-960 service manual I have). If that would help I can take a photo of the schematic (sorry,no scanner). __________________ stew ☮ -"A sane man in an insane world appears insane."

16th May 2012, 01:39 PM	#8
c2cthomas 49 - for the 16th time diyAudio Member Join Date: Oct 2006 Location: Near "Music City" (Nashville Tennessee)	I can get a service manual for the A760 - but no luck for an A6 - still looking for a manual on the 760 II But here is some important safety information from Yamaha about that series of amps. Safety Information Yamaha amplifiers (1980-1982) - Yamaha - Other European Countries __________________ "You can't always get what you want" K. Richards/M. Jagger *** "Next time I will know some things better" Zen Mod

16th May 2012, 10:46 PM	#10
Nanook diyAudio Member Join Date: Feb 2004 Location: Chinook Country.Alberta	760 and A-960 use the same power supply, so it follows that the European versions would be the same. My first try at audio included some Wharfedale Delta speakers, Yamaha A-420 amp and a Dual direct load cassette deck. It still brings back fond memories __________________ stew ☮ -"A sane man in an insane world appears insane."


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14th June 2011, 06:38 AM	#2
sesebe diyAudio Member Join Date: Jan 2011 Location: Iasi	Although no one knows this scheme? Do not believe it that.

30th July 2011, 01:32 AM	#3
sesebe diyAudio Member Join Date: Jan 2011 Location: Iasi	Anybody?

16th May 2012, 01:01 PM	#5
sesebe diyAudio Member Join Date: Jan 2011 Location: Iasi	Hi, The A6-A model it is the name of Japanese model, for Europa the name for the same model, except power supply, is A760II and A760 it is the name for A6 model. Between A6-A and A6 (or european names A760II and A760) there are a lot of diferences and the schematics are quite diferent. I ask you again if somebody have the schematic for Yamaha A6-A or european version A760II. Thank you

16th May 2012, 01:29 PM	#7
jony diyAudio Member Join Date: Jun 2004 Location: wroclaw	Here you can find a lot of free service manuals Yamaha manuals, schematics and brochures - Hifi Manuals

16th May 2012, 06:07 PM	#9
sesebe diyAudio Member Join Date: Jan 2011 Location: Iasi	Hi, Thanks for replay. I have the schematic for A760, A960, A960II and A1060, some M series and B6. I think that the only schematic that I do not have is for A6-A (european A760II). This model I have at home. I already made the transformer at a local supplier but I do not know the values of voltage and I think that I made to high voltage (original transformer was shorted). Now it is working beautiful but some stages from final amplifier work to hot (some current source and voltage suppliers for input stages I think). I want to update the schematic to increase the efficiency and to reduce the working temperature.

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