The TC pickups are designed specifically for tricone type resonator guitars. For biscuit bridge guitars, use the Schatten NR series pickups. For spider bridge guitars, use the Schatten RG series pickups. The Schatten TC pickup can be installed in a non-invasive manner with minimal or no modifications to your instrument. This pickup has proven to be very popular with our players and artist and it provides great sound quality with good anti-feedback characteristics. Passive Model, No Preamp Players who will be plugging directly into a 'normal' guitar amp will find that they get great sound quality from the TC in passive form. No preamp should be required in this situation. Should you require the preamp but don't want to put it and a battery inside your tricone then you should purchase the TC in passive format and add one of the Schatten outboard Preamp/DI units to your pickup system. If you already own an outboard guitar preamp, the TC pickups in passive format should work properly with just about anything you might have.