Full ((link))tone Ultimate Octave Schematic Jun 2026

Fulltone’s modifications focus on versatility and modern reliability:

| Feature | Notes | |--------|-------| | | Uses a small transformer (like an LT44 or similar) driven by one transistor, with the octave generated via asymmetric clipping after the transformer. Less prone to “glitchy” tracking than an Octavia, but still guitar‑volume sensitive. | | Fuzz core | Two‑stage silicon transistor gain stage. Input impedance is moderate – works well with humbuckers and PAFs, but can get muddy with very hot pickups unless you adjust input cap values. | | Tone stack | Passive low‑pass filter in octave mode; different filter in “full” (non‑octave) mode – often just a capacitor roll‑off on the second transistor’s collector. | | Mode switching | 3PDT switch that changes the feedback loop and output coupling, effectively bypassing the octave transformer and adjusting the EQ. | | Power supply | Standard 9V DC, negative center. No charge pump – relies on transistor bias. Voltage sag (via a dying battery or sag control) affects octave clarity significantly. | fulltone ultimate octave schematic