What might help with respect to the radio signal problem would be purchasing a pair of inexpensive ferrite clamps, that would be placed on the phono cables near their connection to the phono stage. Many such things are listed here:
https://www.mouser.com/Fair-Rite/Passive-Components/EMI-Filters-EMI-Suppression/Ferrites/Ferrite-Clamp-On-Cores/_/N-bw7t7Z1yzvvqx?P=1z0zldu
The choice among them would be based on whether the radio signal is on the AM band, or the FM band, or one of the ham radio bands, and on the physical diameter of the phono cable, and on whether the phono cartridge is a low output moving coil type or a moving magnet or other high output type.
Another happy owner of a Herron phono stage here, btw. And I don’t doubt that the phono stage built into Ralph’s (Atmasphere’s) preamps is great as well. And I would feel safe in saying that no audio company in existence betters those two in terms of responsiveness to and support of their customers.
Regards,
-- Al
https://www.mouser.com/Fair-Rite/Passive-Components/EMI-Filters-EMI-Suppression/Ferrites/Ferrite-Clamp-On-Cores/_/N-bw7t7Z1yzvvqx?P=1z0zldu
The choice among them would be based on whether the radio signal is on the AM band, or the FM band, or one of the ham radio bands, and on the physical diameter of the phono cable, and on whether the phono cartridge is a low output moving coil type or a moving magnet or other high output type.
Another happy owner of a Herron phono stage here, btw. And I don’t doubt that the phono stage built into Ralph’s (Atmasphere’s) preamps is great as well. And I would feel safe in saying that no audio company in existence betters those two in terms of responsiveness to and support of their customers.
Regards,
-- Al