I'm looking to renew my Yamaha CA-610MKII. I've had it since 1996.
It is from 1977 I think and is all original and works.
Looking at the Schematic, none of the transistors are available unless you go on ebay. I don't have a problem replacing capacitors as they are available.
I found this website that someone named S.Kinder renewed one but left out cross-reference parts he used!
Vintage Hi-Fi Audio Restorations: S.Kinder's Yamaha CA-610 MKII Integrated Amplifier Restoration
I like what he did and there are a few transistors in the pics and reading that show what he used and are available from mouser/digikey.
So I made a list of part numbers and the substitutes that I think will work. Took me all day!
I'm asking for help if anyone could verify my selections are good and if not, please let me know of alternatives.
I really want get this unit a little more current as far as parts.
For the cost of the replacement semi's, I think it's worth it.
Please let me know, any help would be good...
Thanks all
It is from 1977 I think and is all original and works.
Looking at the Schematic, none of the transistors are available unless you go on ebay. I don't have a problem replacing capacitors as they are available.
I found this website that someone named S.Kinder renewed one but left out cross-reference parts he used!
Vintage Hi-Fi Audio Restorations: S.Kinder's Yamaha CA-610 MKII Integrated Amplifier Restoration
I like what he did and there are a few transistors in the pics and reading that show what he used and are available from mouser/digikey.
So I made a list of part numbers and the substitutes that I think will work. Took me all day!
I'm asking for help if anyone could verify my selections are good and if not, please let me know of alternatives.
I really want get this unit a little more current as far as parts.
For the cost of the replacement semi's, I think it's worth it.
Please let me know, any help would be good...
Thanks all
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A typical fault of the Yamaha CA-xxxx series are the reed relay of the pre stage. That is often mis-diagnosed because it can 'scratch' like a dirty or oxydized pot or switch.
Thank you for posting the substitution parts list!
Thank you for posting the substitution parts list!
I agree.
Another hard-to-find issue are the coax balance-volume pots (on the bigger amps, all CA except the 610 and 410)
Another hard-to-find issue are the coax balance-volume pots (on the bigger amps, all CA except the 610 and 410)
Only replace the electrolytic capacitors (using static safe methods), and then check
for any remaining problems.
for any remaining problems.
Yes the caps are 44 years old and wouldn't hurt to change them. Otherwise the stereo operates perfect. Very clean, no noise from any pots or switches. I just know that I should at least have the semi's on hand. It's less than $100 for them.
Don't assume that new semiconductor replacements will be equivalent, better, or even work.
At least keep the old ones in the event of a problem.
At least keep the old ones in the event of a problem.
Yes that's why I posted what I could find for equivalents and just maybe someone with more experience than me could verify my work.. I did read lots of different forums with possible replacements and did look at data sheets, if something was way off, I kept looking.
Bear in mind that a "replacement" recommendation for semis will not include specific requirements
of your circuit. Usually just voltage/current rating and package/pinout. It may function, but in a
substantially inferior manner. For example, noise, 1/f, beta vs current, will vary much even from
one mfr to another for the same part number, and certainly from one part number to another.
You are second guessing the designer of the circuit, which is not a good idea.
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Agree, So what to do in the future if transistors start failing?
I wish S.Kinder detailed his pats list. It looks like he did all the cross reference work with testing to prove function.
Interesting way they designed the Volume/tone controls for this thing...I get a kick out of the voltage they used!
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@90scaraudio
Do as rayma says. Don't re-transistor the amp. He is offering you wisdom, don't ignore his advice in your haste.
And replace electrolytic or tantalum caps only, not mylar or ceramic caps.
Don't fully believe or rely on reports of grand successes posted on the internet. There is a thing called "expectation bias", a psychological phenomenon. When someone goes into an endeavor with expectations of success, more often than not the result will be perceived as successful whether it is or not.
Do as rayma says. Don't re-transistor the amp. He is offering you wisdom, don't ignore his advice in your haste.
And replace electrolytic or tantalum caps only, not mylar or ceramic caps.
Don't fully believe or rely on reports of grand successes posted on the internet. There is a thing called "expectation bias", a psychological phenomenon. When someone goes into an endeavor with expectations of success, more often than not the result will be perceived as successful whether it is or not.