Thank you for very, very informative info.
Jim,
If I were to make RF coil probe to test magnetic field, I'm sure it would prove your statement about magnetic field orientation. But, it would not help me with what level of magnetic field is acceptable and what not, as this DIY measurement tool would be very inaccurate.
So, I'm thinking of two "real life" test scenarios.
First one is to short RCA inputs with 1k (for MM cart) resistor and see the noise/signal level at the outputs. This would measure how much of a signal is induced from power supply internally.
The second one is to use 3 feet phono cable, terminated again with 1k resistor (to simulate cartridge) connected to the inputs. Again, measure output signal. This, hopefully, would tell me if I get electromagnetic interaction from power supply (choke and transformer) to the input cable.
Any comments on these two test ideas?
Thanks
Sergey