I have two original tuners and neither will respond to tune a station.

The red led is on and I've tried both on two different units/sleds. Tuner #1 was used for a while but has been stored for years .When tuner #2 failed I swapped in #1 with the same result.I just installed a new hard drive in my spare empeg and neither tuner will tune. Either tuner is recognized but just sits on 520 khz or 87.9 mhz.

Any ideas?