I own these two – they both have 2x Tubes built in.
Unfortunately there is no information out there what exactly these tubes are used for, where they are in the circuit or what “job” they have – why are there two of them, etc.
Just posting this comment in the interest of safety for all who may read it. If I’m reading it then others are reading it.
The tubes run at full plate voltage (like tube amp voltages) and aren’t “diy friendly” effects. It’s not starved plate voltages like many tube pedals. Do not mess with the Tube pedals unless you know what you’re doing. If you know what you’re doing you’re not asking questions here. 😉
