I would skip the 540P as RIAA EQ is active and it uses ICs. My vote would go to the vintage Radio Shack 42-2101A phono preamp, which you should be able to buy for around $30.00.
It is all discrete, no ICs or op amps and sounds wonderful. I had it at the same time as the 640P and preferred it by a wide margin. It does not have a high gain stage for MC cartridges however. Then again, using a $200.00 phono stage with a low output MC may not be the best idea either.
It is all discrete, no ICs or op amps and sounds wonderful. I had it at the same time as the 640P and preferred it by a wide margin. It does not have a high gain stage for MC cartridges however. Then again, using a $200.00 phono stage with a low output MC may not be the best idea either.

