Master List of 40 Guitar Pedals with Tubes - Guitar Chalk
The Gazelle Tube Preamp - unleash the beast
One Watter - Tube Amplifier Pedal – Hagerman Amplification
Amazon.com: Guitar Mini Effects Pedal Over Drive - Warm and Natural Tube Overdrive Effect Sound Processor Portable Accessory for Guitar and Bass, Exclude Power Adapter Green - FOD3 : Musical Instruments