Iridium - 500 series Inductor Equalizer
Carbon - 500 series Classic Equalizer
Silicon - 500 series Solid State Mic Preamp
Barium Solo - 500 series Peak Signal Meter
Barium Duo - 500 series Peak Signal Meter
Lead - 500 series Headphone Amplifier
Zinc - 500 series Instrument Amplifier
Iron - 500 series Transformer Mic Preamp
Helium - 500 series Hybrid Equalizer
