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Hearing radio even with no tuner connected, Yamaha Ca810

the turntable's metal chassis might be providing shielding to the amplifier if its got a wood case instead of a metal one.


here's a thought, if the case is just wood without a metal one underneath, try lining it with foil tape. Don't block any vents. The foil would need to come down to a point on the cover that it touches the metal chassis when its installed in order to provide a ground.
 
I don't _think_ the TT has a metal chasis (uturn orbit) but... maybe it does. I did try tin foil on top of the case - and I ran a pigtail from the ground knob up to the tin foil and touched them. It had no effect. Maybe tin foil is insufficient? Maybe copper foil will be more effective?

The amp case is just wood/mdf. The bottom of the amp is shielded - i think.
 
if aluminum does nothing I don't see that copper would do much different.

Not specifically familier with the Uturn models, was thinking perhaps it had a metal internal plate or platter. Dunno if it doesn't have very much metal in it, I really don't know why it would shut the radio up.
 
Platter is acrylic. There may be a metal shield in there. Dunno. But if there is a metal shield that's helping (or it could, of course, just be the orientation of the cables now) . And then more perplexing was just placing another object in the proximity of the CA810 (eg, my old amp, the eq, etc) seemed to reintroduce RFI to the equation., Sigh.
 
After I first rebuilt the boards in my Hafler DH-200 I had a key component from the board to the MOSFET's on one channel placed incorrectly and that side was very sensitive to the metal cover. When I would put it back on it would hum like crazy. Reviewed my work and corrected it and all was good. Maybe you have more than one issue.
 
chrisinsc said:
After I first rebuilt the boards in my Hafler DH-200 I had a key component from the board to the MOSFET's on one channel placed incorrectly and that side was very sensitive to the metal cover. When I would put it back on it would hum like crazy. Reviewed my work and corrected it and all was good. Maybe you have more than one issue.
Click to expand...

mentally, i definitely do. I believe the previous owner replaced the lightbulbs. Possibly with LED's. Maybe they did something stupid during that process?
 
equalizeme said:
Platter is acrylic. There may be a metal shield in there. Dunno. But if there is a metal shield that's helping (or it could, of course, just be the orientation of the cables now) . And then more perplexing was just placing another object in the proximity of the CA810 (eg, my old amp, the eq, etc) seemed to reintroduce RFI to the equation., Sigh.
Click to expand...
I have a Custom Orbit with an acrylic platter myself I use in a second system.
One of the issues with these is grounding. The tone arm itself isn't grounded.
I saw a video where someone grounded the tone arm to the ground plane on the small PCB inside. There was another added ground on the PCB in the model with an internal phono preamp. Adding a ground wire that can be connected to a receiver or integrated amp.
 
maybe its the other way around, the amplifier providing shielding to the turntable ?


maybe you just have to run the table on top of the amp. Generally not preferred for heat reasons but sometimes there isn't a lot of option in the matter.
 
gadget73 said:
maybe its the other way around, the amplifier providing shielding to the turntable ?


maybe you just have to run the table on top of the amp. Generally not preferred for heat reasons but sometimes there isn't a lot of option in the matter.
Click to expand...
oh... well that's a good thought. Easy to test - I'll disconnect the table and move it around. Since I usually hear the interference on any input, this will be a good test.

I wonder if the CA2000/2010 had better shielding/filtering?....
 
I don't have time to play with it tonight but when I got home my partner was playing a record. Shame about the noise because I love the way this thing sounds.... But I did notice a smell by the amp. It's not strong, but it's there. Is that a leaky cap or just because it's an old amp? I do t know how to describe it.... Heavy? If the cap goes to the ground, and is part of the noise filtering, maybe that's part of my problem?
 
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