Electronics repair (older kenwood amp)

[Ah Pook]

Looking to get some work done on a ‘77 Yamaha pre amp. Have to go find him.

[Ah Pook]

http://audiokarma.org/forums/index.p...epairs.276901/

[brutal]

http://audiokarma.org/forums/index.p...epairs.276901/

Man, that's an old thread. But as you can see Dr Dan comes recommended.

That said, I haven't talked to him in a few years. There used to be some local GTG for the local AK'ers. In fact, that's how I met a gun buddy that's also an (infrequent) member here.

[brutal]

Looking to get some work done on a ‘77 Yamaha pre amp. Have to go find him.

I do a lot of Yamaha stuff, but I've been backed up a little on my own gear.

Dr. Dan is gooder than I am, but I'm cheaper, often free and just charging for parts for forum pals.

What model?

What's the issue?

P.S. There's a specific Yamaha forum over there on AK, easy to find me, same handle. I don't spend too much time on it these days, but still cruise through a couple times a week.

[Ah Pook]

I do a lot of Yamaha stuff, but I've been backed up a little on my own gear.

Dr. Dan is gooder than I am, but I'm cheaper, often free and just charging for parts for forum pals.

What model?

What's the issue?

P.S. There's a specific Yamaha forum over there on AK, easy to find me, same handle. I don't spend too much time on it these days, but still cruise through a couple times a week.

Yamaha CA-810

Picked it up on Ebay a few years back. Had a buzzing noise, so cleaned everything with electronics cleaner. Noise went away.

The amp is set up with a Mac Mini run through a DAC to the amp. The sub woofer is plugged in to one side of the "pre out-main in". I'm getting a "revolving" static sound that seems to build when everything is on. If I unplug the amp the noise goes away for a while. If I unplug the sub the noise is diminished (same thing if I restart the Mac Mini). I've run two different laptops on this system with no problems, so not sure if the Mini is the issue.

Talked to Dr. Dan yesterday and dropping the amp off on Sat. There are some other issues I want him to look at. I normally wouldn't bother but I like sound of the amp.

[brutal]

Yamaha CA-810

Picked it up on Ebay a few years back. Had a buzzing noise, so cleaned everything with electronics cleaner. Noise went away.

The amp is set up with a Mac Mini run through a DAC to the amp. The sub woofer is plugged in to one side of the "pre out-main in". I'm getting a "revolving" static sound that seems to build when everything is on. If I unplug the amp the noise goes away for a while. If I unplug the sub the noise is diminished (same thing if I restart the Mac Mini). I've run two different laptops on this system with no problems, so not sure if the Mini is the issue.

Talked to Dr. Dan yesterday and dropping the amp off on Sat. There are some other issues I want him to look at. I normally wouldn't bother but I like sound of the amp.

CA-810 integrated is a nice unit. It's worth putting a little $ into it to keep it running. Yamaha has often been call, "A wire with gain." they truly are "Natural Sound." Yes, I'm a huge fanboy.

I don't recall off the top of my head if there are any in that model, but there's a specific transistor that was commonly used in many products of that era that are know to go noisy. SC458 "outhouse" cause it's rectangular with a sloped top and looks like an outhouse. Obviously it could be lots of other things, including dried out electrolytics, particularly in the PS sections... Also poor ground connections lead to lots of weird things. Hell, without a polarized plug, even switching that around can sometimes fix ground loop/noise issues.

Anyone cleaning switch contacts should be using only Caig DeoXit products. Magic sauce in there. Even then, there are special formulas without harmful solvents if the switch internals have some plastics. Read all about them here, http://store.caig.com/s.nl/sc.2/category.188/.f , but then buy wherever is cheaper.

Dr Dan should be able to get that thing squared away for you.

I don't have one here, but do have the CA-1000, CA-1010 and CA-2010. :-)

There's a reason jerrymrc gave me my current handle. He's another member here I met at a local AK GTG.

[jerrymrc]

CA-810 integrated is a nice unit. It's worth putting a little $ into it to keep it running. Yamaha has often been call, "A wire with gain." they truly are "Natural Sound." Yes, I'm a huge fanboy.

I don't recall off the top of my head if there are any in that model, but there's a specific transistor that was commonly used in many products of that era that are know to go noisy. SC458 "outhouse" cause it's rectangular with a sloped top and looks like an outhouse. Obviously it could be lots of other things, including dried out electrolytics, particularly in the PS sections... Also poor ground connections lead to lots of weird things. Hell, without a polarized plug, even switching that around can sometimes fix ground loop/noise issues.

Anyone cleaning switch contacts should be using only Caig DeoXit products. Magic sauce in there. Even then, there are special formulas without harmful solvents if the switch internals have some plastics. Read all about them here, http://store.caig.com/s.nl/sc.2/category.188/.f , but then buy wherever is cheaper.

Dr Dan should be able to get that thing squared away for you.

I don't have one here, but do have the CA-1000, CA-1010 and CA-2010. :-)

There's a reason jerrymrc gave me my current handle. He's another member here I met at a local AK GTG.

I know nothing. I do remember the early days @ AK. I still drop in from time to time. Brought my switchable Yamaha stuff with me to Europe. I did recap a few items that had just been sitting. I will say that once recapped many items were in spec right off the bat.