axxman
Active Member
Thank you, got it.
Yamaha CA-610 restore or CA-1010
- Thread starter axxman
- Start date
Out of 360 possible positions only 1 is correct.
The JB Weld has a real slow setting time so minor quick adjustments are possible.
axxman
Active Member
so much for relaxing, I plan to do the loudness knob first as that one is "on" or "off"Out of 360 possible positions only 1 is correct.
Update, the first one is done, the loudness knob, I will not touch it for 24hrs, then turn it on and off 5-10 times, if it passes, I will proceed.
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axxman
Active Member
Ok, 24hrs passed and the loudness knob is on there rock solid so the base and balance got the same treatment, the treble was fine. Here is the finished result. I am done with this one for now until it needs capacitors or other parts. I would like to swap out the power cord but the current one is in good condition, no fraying or cracking. Now onto the CR-620, gonna have a look inside, inspect and clean. it is a bit more complicated with the tuner though.
time for these two to switch positions.
ok, the CR-620 has a bit different construction but it appears to be very similar, it has the variable loudness knob compared to the on/off knob of the CA-610. Here the transistors are located on the side 2 have heatsink/covers (1 is removed in the photos) These appear to have been serviced, however I know it was not in the last 15-20 years, Although technically I am the 3rd owner of this reciever, I know a bit of the history, and it was never used by the friend that gave it to me. He found it in the house he bought 4 years ago, it was in an audio closet and used to power in-ceiling speakers throughout the house, with volume controls in most of the rooms. ok time to get started.
Here, I believe is an example of the infamous glue, I will have to try to get that off.
Here are some more photos of the board, I will clean what I can very carefully, but this one appears to be more open and easier to work on, just a bit more going on here with the tuner.
Here is a better closeup of the glue situation. The 4 black caps in the center were replaced by the shop I had working on it last month.
ok, I will come back with some post cleaning in little bit.
Transistors done, should be good for a while.
not sure what to do about the glue, it is soft enough you cant just scrape it off without putting excessive pressure on it, but not hardened enough that you can just chip away at it. I think I will need to play it at high volume, maybe I can burn it off with excessive heat ;-)
CA-610 back in its garage.
time for these two to switch positions.
ok, the CR-620 has a bit different construction but it appears to be very similar, it has the variable loudness knob compared to the on/off knob of the CA-610. Here the transistors are located on the side 2 have heatsink/covers (1 is removed in the photos) These appear to have been serviced, however I know it was not in the last 15-20 years, Although technically I am the 3rd owner of this reciever, I know a bit of the history, and it was never used by the friend that gave it to me. He found it in the house he bought 4 years ago, it was in an audio closet and used to power in-ceiling speakers throughout the house, with volume controls in most of the rooms. ok time to get started.
Here, I believe is an example of the infamous glue, I will have to try to get that off.
Here are some more photos of the board, I will clean what I can very carefully, but this one appears to be more open and easier to work on, just a bit more going on here with the tuner.
Here is a better closeup of the glue situation. The 4 black caps in the center were replaced by the shop I had working on it last month.
ok, I will come back with some post cleaning in little bit.
Transistors done, should be good for a while.
not sure what to do about the glue, it is soft enough you cant just scrape it off without putting excessive pressure on it, but not hardened enough that you can just chip away at it. I think I will need to play it at high volume, maybe I can burn it off with excessive heat ;-)
CA-610 back in its garage.
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KrautNotRice
Well-Known Member
Great thread, looks like you scored some nice pieces.
Watching some Tharbamar on YouTube I see... He's actually a fellow AKer.
axxman
Active Member
Thanks KrautNotRice, Tharbamar yes he changes his equipment constantly, which keeps me from doing so myself. I have a couple new additions coming, not so exciting just a power supply and a switchbox. I am mostly done for now, I have 2 vintage and 2 modern systems plus an 80s JVC reciever and Bose 201s for the garage. . which is probably twice what I need, I don't plan on adding much until I move in a year or two.
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axxman
Active Member
So now that my equipment seems to be functioning correctly, I want to de-clutter, the Bose are destined for my house in florida, eventually they will be part of the garage system.
I thought it would be nice to just have 1 set of speakers here and be able to switch between the CA-610 and A-S801 to see what 40 years difference sounds like. They already share the same source, my Yamaha WXC-50 and a Sony MD3 Minidisc/CD deck.
So I found many devices but this was the only one I could find with Banana Plugs.
Construction is metal, it seems well made.
I thought it would be nice to just have 1 set of speakers here and be able to switch between the CA-610 and A-S801 to see what 40 years difference sounds like. They already share the same source, my Yamaha WXC-50 and a Sony MD3 Minidisc/CD deck.
So I found many devices but this was the only one I could find with Banana Plugs.
Construction is metal, it seems well made.
axxman
Active Member
Finally get to hear it in my house, the speakers are Polk Audio Monitor 4s I believe, I bought new in August 28, 1989, but I have never had a decent amp until now.
axxman
Active Member
Finally get to hear it in my house, the speakers are Polk Audio Monitor 4s I believe, I bought new in 1988 or 89, but I have never had a decent amp until now.
reposting so the photo would be visible
axxman
Active Member
My Polk Audio speakers getting cranked by my Yamaha CR-620
My Polk Audio Monitor 4 Purchased by me 2 August 1989. Designed and Manufactured in the Baltimore MD USA! These were their entry model speakers. 99 dollars per speaker according to the receipt. Not some high end boutique model. and I am cranking it, the 620 is warm. Music streaming Flac from my iPhone 11 Pro Max (apple is an American company) I am just amazed 30 and 40 year old technology performing this good.
The manual does a good job of explaining distortion and overdriven amplifiers.
4 ohms 92dB efficiency.
My Polk Audio Monitor 4 Purchased by me 2 August 1989. Designed and Manufactured in the Baltimore MD USA! These were their entry model speakers. 99 dollars per speaker according to the receipt. Not some high end boutique model. and I am cranking it, the 620 is warm. Music streaming Flac from my iPhone 11 Pro Max (apple is an American company) I am just amazed 30 and 40 year old technology performing this good.
The manual does a good job of explaining distortion and overdriven amplifiers.
4 ohms 92dB efficiency.
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MonkeyRelish
Active Member
Look around for some Polk Monitor 5’s or 7’s. They will blow the 4’s away.
Mr Relish
Mr Relish
axxman
Active Member
yes, I was thinking 7s, I went to college in Towson Maryland, I lived probably less than 5miles from the Polk facility in Baltimore. Maybe it is my age, but I am just amazed about how well made things were 30-40-50 years ago and how it seems everyone has succumbed to racing to the bottom in everything. Speakers, electronics, cars, power tools, you name it. I guess the meek have inherited the earth. I am just going to blast my Polks until my ears bleed or until the neighbors call the cops...cuz I don't think my CR-620 will stop working either. ;-0
Update: all previous comments must be revised upward as I just discovered I was listening with the high pass and low pass filters engaged. They are now disengaged. So even better now, I have a second bottle of Saki I will conduct testing.
Update: all previous comments must be revised upward as I just discovered I was listening with the high pass and low pass filters engaged. They are now disengaged. So even better now, I have a second bottle of Saki I will conduct testing.
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axxman
Active Member
Zu Dirty weekend speakers arrived today, much bigger and heavier than I expected. the red is exactly what I wanted. let the listening begin.
My apologies for posting this here, but this thread is kind of my personal thread documenting all my stereo stuff, I don't really go outside of the Yamaha forum so I try to keep it all in one place.
View attachment 1748842
My apologies for posting this here, but this thread is kind of my personal thread documenting all my stereo stuff, I don't really go outside of the Yamaha forum so I try to keep it all in one place.
View attachment 1748842 Attachments
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MonkeyRelish
Active Member
They would certainly be a step up from the polks. I looked up a Steve Gutenberg review of those, as I hadn’t heard of them, and now I’m jealous. Enjoy !
Mr Relish
Mr Relish
axxman
Active Member
Thanks, so far I am very pleased with them. I have 60 days to try them out and if I dont like them ship them back. I have already gone through my test playlist and I can say they are not going back at this point. They are too big for the room I am in currently, however I will be moving in the next year or two and I cannot wait to set these up.
