Tube/rør pre-amp 12AY7 Mic Preamp In today's market, most affordable tube preamps for microphones are disappointing. Electro-Harmonix has changed that with the creation of the 12AY7 Mic Preamp. Equipped with a 12AY7 EH tube and a 12AU7 EH driver, it gives microphones the widest dynamic swing with the warmest possible tone and accuracy. It uses an actual 200-volt supply instead of the ''faked out'' 12 or 48 volts you’d get with common models, delivering 50 dbs of gain into a high impedance load, and about 40 dbs of gain into 600 ohms. The 12AY7 Mic Preamp’s special FET current-balancing circuit allows the tubes to amplify the microphone signal to line level while eliminating noise, and protecting against hum and hostile electrical environments. It has an extra TRS output for separate line control, which can be used as a splitter or an AUX Send for monitoring. Input connections are balanced In and Out (XLR) with a ?'' TRS balanced buffer out. The unit also boasts a phase reverse switch and a +4dBm indicator light for setting optimal mic level. The 48 volt phantom power is soft starting and "pop free."