Hi Holly,
The Art Audio Carissa Signature has a specified input impedance of 180K, so that would be a fine match with the FM-90X and nearly all other vintage tube tuners, even with the tuner output connected to both input channels (resulting in the tuner seeing a 90K load).
The FM-90X has no volume control as such, just a small level control on the rear panel which would probably be impractical to use as your main volume control when listening to it. But if the Carissa Signature includes the optional volume control, that would be no problem either.
If you should decide against the FM-90X, but still want to consider a vintage tube tuner, given your price preference I would continue to recommend considering a mono unit.
FWIW, the best performing vintage tube mono tuner in my experience that with some patience I suspect can be found in your price range is the H. H. Scott 310D. It includes a front panel volume control and a multiplex out jack, and it provides standard screw terminals for connection of 300 ohm twinlead (which is what the cheapie indoor wire dipoles connect with). As you probably realize, those screw terminals can be easily adapted to coax with an inexpensive adapter, sometimes referred to as a balun or a 75 ohm to 300 ohm matching transformer.
Best regards,
-- Al
The Art Audio Carissa Signature has a specified input impedance of 180K, so that would be a fine match with the FM-90X and nearly all other vintage tube tuners, even with the tuner output connected to both input channels (resulting in the tuner seeing a 90K load).
The FM-90X has no volume control as such, just a small level control on the rear panel which would probably be impractical to use as your main volume control when listening to it. But if the Carissa Signature includes the optional volume control, that would be no problem either.
If you should decide against the FM-90X, but still want to consider a vintage tube tuner, given your price preference I would continue to recommend considering a mono unit.
FWIW, the best performing vintage tube mono tuner in my experience that with some patience I suspect can be found in your price range is the H. H. Scott 310D. It includes a front panel volume control and a multiplex out jack, and it provides standard screw terminals for connection of 300 ohm twinlead (which is what the cheapie indoor wire dipoles connect with). As you probably realize, those screw terminals can be easily adapted to coax with an inexpensive adapter, sometimes referred to as a balun or a 75 ohm to 300 ohm matching transformer.
Best regards,
-- Al