Therio tube preamp (model-T 1st gen. + mods) by dpFX

"dpFX Pedals" builds handmade and custom effects (dpeffects.com). All products are serial numbered.

This is THERIO, a complete model-T (1st gen.) tube preamp, including the phase inverter. We've also added a few mods (explained below) to make it more versatile and these mods are the only changes that distinguish the THERIO model from the kTinos model.

Most attempts out there trying to replicate the tone of the 1st gen model-T preamp only used the first two stages of the preamp, omitting the phase inverter that comes after the EQ section, which also includes the feedback loop and the presence control that comes with it.

From our perspective, the phase inverter is a crucial part of the circuit and plays a significant role in the gain, tone and presence control and to the overall output volume, a role so important that it felt pointless to design such a tube preamp with this part missing.

A properly selected power transformer housed inside provides the exact voltages the circuit requires for proper operation and correct performance. It also ensures the operation of the preamp with either 230V or 120V AC power. (A power selection switch is available at the back.)

Two outputs for connection to power amps have been included, each with its own dedicated output level control.

Added features/mods:

• Toggle switch for HI/LO gain selection in each channel (Normal & Brite)
• Brite toggle switch for the Normal channel
• 3-position toggle switch for Treble-bleed in the Normal channel.
• 3-position toggle switch offering 3 distinctive modes for the Negative Feedback Loop

• Aluminum enclosure (handpainted).
• Weight: ~2.3 kg (5.07 lbs)
• Enclosure dimensions: 275x173x65mm (10.82'' x 6.81'' x 2,56'')
• Dimensions including the protruding protectors & knobs: 275x200x90mm (10.82'' x 7.87'' x 3.54'')
• Vacuum Tubes required: 12AX7 (3 pieces, included). If you don't want me to include any tubes just let me know before you place your order.
• AC Powered (230V / 120V). A power selection switch is available at the back.
• Power connector: IEC 60320 C14 (E). It requires a C13 removable cord. (cord is only included for EU residents.).

Shipping method: 1st Priority Parcel Service (tracking number provided).