I agree with Mike Lavigne, magnetic interference from the power supply of the amp can harm the preamps performance. That's why Lamm asks for separation between the two.
On the Treo 650, I have that same phone and the interference is caused by it operating on the GSM network.
My wife's Samsung and son's Motorola RAZR phones do the same thing because they too are GSM phones. Anytime these phones "check in" with the network (ours is Cingular) everything near them gets the raspy noise through the speakers.
This includes our AM-FM desktop radio, all four of our hard wired AT&T land line telephones, my stereo system (listed here), the FM car radio in my truck, my Macintosh computers sound system and my sons Windows based computer sound system.
I know that FCC regulations state electronic device may not interfere with other products, but this appears to be the exception. Perhaps GSM phones are exempt or were not held to the same standard as other devices.
On the Treo 650, I have that same phone and the interference is caused by it operating on the GSM network.
My wife's Samsung and son's Motorola RAZR phones do the same thing because they too are GSM phones. Anytime these phones "check in" with the network (ours is Cingular) everything near them gets the raspy noise through the speakers.
This includes our AM-FM desktop radio, all four of our hard wired AT&T land line telephones, my stereo system (listed here), the FM car radio in my truck, my Macintosh computers sound system and my sons Windows based computer sound system.
I know that FCC regulations state electronic device may not interfere with other products, but this appears to be the exception. Perhaps GSM phones are exempt or were not held to the same standard as other devices.