Idea to reduce RFI

You can't hear RFI. The RF signal must be demodulated. Corrosion at a connection can create a diode which provides the demodulation. So, clean all your connections.

I have never experienced the RFI problem except long ago with a turntable/phono (high gain) connection. I have experimented with trying to induce the problem using cordless phones and cell phones activated just inches away from the audio equipment, but I hear no effect.

>> That is, start with just power amp and speakers.
Now, how does Milen007 get music to play thru the speakers? Run the CDP directly into the power amp?

Uh, er, you don't LEAVE the system this way for listening to music. You stick your ear by the speaker to see if, in the original poster's case, the offending "radio channel" can be heard. If it can, then the interference MUST be solved in this configuration BEFORE it can be reliably solved in a more complex one.

the FM signals are somewhat AM. So, the possibility of catching a FM station thru Milen007's system is quite real.

Nope. FM interefence on baseband audio electronics is manifested mainly has hum and buzz, that changes in intensity and timbre as cables are moved around.

>> very few balanced input stages have much common-mode
>> rejection above 3KHz or so.
Another terribly ignorant statement!!

Whatever, dude. Actually, 3KHz is even quite optimistic, especially for active balanced inputs -- most I've measured deteriorate up from 60Hz by at least a single-order slope.

For more information on the subject, I recommend Bill Whitlock's excellent papers (available at jensentransformers.com), which I agree with the vast majority of. I also highly respect the work of Douglas Self and recommend reading all of his stuff . . . even though on this particular subject I differ with his conclusions.

>> For more information on the subject, I recommend Bill
>> Whitlock's excellent papers (available at
>> jensentransformers.com), which I agree with the vast
>> majority of. I also highly respect the work of Douglas
>> Self and recommend reading all of his stuff . . . even
>> though on this particular subject I differ with his
>> conclusions.
Kirkus, thanx for the reading recommendations. I'll check them out.

Spencer, if power conditioners suck the life out of most amps, how bout isolation transformer?

Kirkus, thanks for the thorough explanation, thats really helps. I did change to better IC, it did eliminate the radio frequency, but hum still present. maybe its caused by my tube preamp.

anyone try bybee? does it helps?

Milen,

Try it and let us know. I don't have any experience w/them. Cheers,

Spencer