Here are a couple of hookup diagrams for TC Preamps. We still make these preamps as special order. They are a bit more complicated to install than our AGB or AGDB preamps, so the TC preamps are recommended for experienced installers.
TC1 has a 300KOhm input impedance and an unboosted gain of 18dB
TC2 is the same as TC1, but it has 2 preamp channels instead of 1.
TC3 has a 400KOhm input impedance and an unboosted gain of 12dB
TC4 is the same as TC3, but it has 2 preamp channels instead of 1.
TC5 has a 500KOhm input impedance and an unboosted gain of 6dB
TC6 is the same as TC5, but it has 2 preamp channels instead of 1.