Custom Tube Buffered Effects loop driver board unassembled DIY kit with Jacks and Pots. 

Super compact design. Only 1.5"x4.2" in size. Fits easily in most guitar amps without modifications. 

Super flexible design-can be installed in multiple different ways. 

Uses any 12AX7, 12AT7, or 12AU7 type tube.

Designed for use in most Tube Guitar Amplifiers.

Operates in serial and parallel modes. (switch included)

Send and Return level controls drive long cable runs and any kind of rack or pedal effect with zero loss

and amazing headroom and clarity. 

Easy to install. 

Designed for amp building enthusiasts and amp technicians. 

Requires assembly. 

Full kit includes:

1 Tube Driver Board with Jacks and Pots.

2 MXR Small knobs. 

1 SPDT Switch

2 feet RG-316 shielded audio signal wire. 

2 feet 22AWG 600V hookup wire.

(tube socket and vacuum tube not included)

Everything you need to upgrade your existing amp or replace that solid-state unit with a real Tube Buffered Effects Loop.

You will immediately hear the difference.

This loop is completely transparent and is designed to be installed "always on".