It's also worth remebering that the standard Rhea came in (at least) two different versions. The early production units were prone to noise problems. Aesthetix modified the circuit, but (to my knowledge) didn't change the model designation. I bought an early production unit which was noisy, but Aesthetix subsequently updated it for me. Jim White told me that the (then) current production units (at the time he did my upgrade) already included the mod he performed on my unit.
Marty
Marty