# TB Extra Duplex

> This gain entry consolidates documented TB Extra Duplex variants, controls, settings and roles across dated guitarist pedalboards.

- Canonical page: https://pedalboardarchive.com/pedals/tb-extra-duplex/
- Machine-readable index of the archive: https://pedalboardarchive.com/llms.txt
- Evidence and reconstruction conventions: https://pedalboardarchive.com/methodology/

- **Category:** Gain
- **Types:** Preamp, Treble booster
- **Also known as:** Pete Cornish Duplex, Treble Booster Extra
- **Controls:** Booster 1 level, Booster 2 level, Two footswitches
- **Identification:** The model is identified.
- **Documented appearances:** 1 board, 1977

A natural-aluminium dual booster built from two independently switched Treble Booster Extra circuits.

## Documented boards

Each row is an observed appearance on a dated board. A position is only an observed one where that board's order evidence says so.

| Artist | Board | Date | Positions | Order evidence | Page |
| --- | --- | --- | --- | --- | --- |
| Brian May | Black plywood touring board | 1977-01-01 | 2 | Source-described | https://pedalboardarchive.com/artists/brian-may/classic-treble-booster-1977/ |