A Designs REDDI 1-channel Tube Direct Box

A-Designs REDDI Tube Direct Box All-Tube Circuitry Level Control w/ Power Cable

Avalon U5 Class A Active Instrument DI and Preamp

Fairchild 661 Line Level Attenuator

Whirlwind ISO8 8 Channel Rack mount Line Level Audio isolation Balancer Black

AVALON DESIGN U5 Pure Class A Instrument DI-Pre Amplifier Black Model Tested

A-Designs REDDI Tube Direct Box All-Tube Circuitry Level Control w/ Power Cable

REDDI V2 Dual Mono All-Tube DI 2-Channel Rack Direct Box