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