Logo with the text "Continuum Overdrive," where "Continuum" is in white with an infinity symbol, and "Overdrive" is in brown.
Guitar amplifier with a beige and brown design, featuring control knobs on the top section, and branded "Sinewave Amplification."

The Continuum Overdrive was created to introduce a balanced overdrive section within the core Continuum circuit, while preserving the integrity of the clean and reverb tones. The goal was to offer a smooth transition from a transparent clean boost to a wide range of blues and rock-inspired gain, all while maintaining the natural clarity and responsiveness that define the Continuum platform.

Designed to emphasize the most important aspects of the electric guitar, the Continuum Overdrive showcases the dynamic interaction between the fretboard and pickups. As the signal is amplified, the amp’s natural responsiveness allows musicians to shape their tone with precision. The Continuum Overdrive provides an exceptional platform for musicians to explore and craft their musical experience with unmatched versatility.

50 Watt 6L6WGC x 2 $4500

100 Watt 6L6WGC x 4 $4650

FEATURES


Close-up of a guitar amplifier panel with knobs labeled Gain, Treble, and Mid, and switches labeled Signal Structure and Sparkle. Text includes "JUUM" and "LIVE."

Signal Structure

The Signal Structure circuit is engineered to optimize the level and tonal balance of the preamp’s input stage. By integrating into the preamp’s mixing stage, it offers two distinct gain and voicing modes:

  • HIGH: This mode increases gain while applying a traditional blackface-style low-frequency curve to the bass response. It provides a more “vintage” tonal character, offering higher gain and volume levels, but with reduced headroom on the preamp side.

  • LOW: This mode offers a more contemporary tonal profile, reducing the harmonic distortion common in vintage circuits. It also smooths the signal path, particularly when driven by external pedals, and improves note separation. The lower gain in this mode results in higher preamp headroom.

Close-up of guitar amplifier control panel with knobs and switches labeled Treble, Middle, Bass, Gain, Sparkle, Mid/Boost, and Deep.

EQ Toggles

  • SPARKLE: This toggle enhances the high frequencies by providing a boost to the top end of the signal after the tone stack, adding clarity and definition without becoming harsh.

  • MID/BOOST: Engaged before the tone stack, this toggle increases the gain in the midrange frequencies of the preamp stage, accentuating the natural character of the tube saturation and enhancing tonal presence.

  • DEEP: This toggle adds a subtle boost to the low-end frequencies, resulting in a fuller, rounder bass response, enhancing overall warmth without muddiness.

Close-up of Sinewave Amplification guitar amplifier controls, showing knobs labeled Power, Contour, Send, Return, and Reverb with a tonal switch labeled EQ, and an on/off toggle switch.

Reverb

The reverb circuit features a highly versatile and musical 3-tube design, utilizing a long decay, 3-spring large tank for rich, immersive reverb effects. The SEND and RETURN controls offer full manipulation of the tail delay and the depth of the reverb mix, providing complete control over the effect’s character.

Reverb EQ Switch

  • BRIGHT: Engages a high-frequency boost in the wet signal, accentuating the treble and creating a more splashy, vibrant reverb effect.

  • NEUTRAL: This is the default mode, providing a balanced reverb response with no added coloration, offering a neutral voicing and feel.

  • DARK: Reduces high frequencies in the wet signal, resulting in a smoother, more subdued reverb with a mellow tonal character.

Close-up of an amplifier control panel showing knobs for bass, gain, volume, and master with switches labeled deep and OD on.

Overdrive

The GAIN control offers a wide range of tonal adjustments, allowing for a smooth transition from a transparent clean boost to higher gain settings suitable for classic rock tones. The circuit is designed to maintain a seamless transition across the EQ curve, ensuring that as the gain is increased, the signal becomes more saturated with added sustain, without sacrificing clarity.

The VOLUME control is used to balance the overall output level relative to the input signal, ensuring that the signal remains in harmony with the desired gain structure while maintaining the tonal integrity of the clean or overdriven sound.

Close-up of a control panel with three knobs labeled "Master," "Contour," and "Sense."

Power Section Input

The MASTER control serves as the final level adjustment before the signal enters the effects loop and phase inverter. By adjusting the balance between the input gain and the master level, musicians can achieve varying levels of preamp headroom, allowing for a wide range of tonal dynamics and responsiveness.

The CONTOUR control is a post-master volume tone-shaping circuit that manipulates the higher frequency ranges of the signal before it reaches the power section. This provides a useful tool for on-the-fly tonal adjustments, especially in live performance situations. It functions as a mix control for bright or dark pickups, helping to tailor the overall tone. When fully rotated clockwise, the CONTOUR control has no effect on the signal. As it’s turned counterclockwise, the circuit engages, softening the treble frequencies for a smoother, more rounded sound.

BACK PANEL FEATURES


Rear view of a guitar amplifier featuring various input and output jacks, power settings, fuse and bias adjustment controls, with visible vacuum tubes inside a fabric-covered case.
Close-up of a guitar amplifier panel showing bias adjustment, bias test-point, and ground connectors.

Bias Adjustment

The Bias Adjustment feature includes an external potentiometer and a multimeter probe point for precisely setting the idle operating range of the output tubes. This system simplifies and streamlines the process of replacing output tubes, allowing for quick, safe, and accurate bias adjustments. By providing direct access to the bias voltage, it ensures optimal performance and longevity of the output tubes, without the need for complicated internal adjustments

Guitar amplifier speaker output jacks labeled for 4 ohm, 4 ohm, and 8 ohm connections.

Speaker Output

Always connect amplifier to correct speaker load before powering up. By not doing so can lead to the output transformer having an extremely bad day.

Close-up of amplifier effects loop with send and return jacks labeled "Effects Loop," "Send," "Return," and "Passive Insertion Point Post Master Volume."

Effects Loop

The Effects Loop is a passive, series interface designed primarily for time-based effects. The MASTER volume functions as a level control for the SEND signal, allowing precise control over the amount of signal sent to external effects. The RETURN stage is optimized for use with balanced, buffered pedals or interfaces, ensuring optimal signal integrity.

Incorporating a RETURN level control can be particularly beneficial, as it allows for fine-tuning of the signal level when reintroduced to the amp’s phase inverter, ensuring a seamless integration of the effects loop with the amplifier’s overall tonal balance.

Guitar amplifier footswitch with two pedals, labeled 'Overdrive' and 'Option', branded 'Sinewave Amplification'.

Foot Switch

  • Stereo 1/4” cable included with amplifier.

  • OVERDRIVE is engaged by either the foot switch or toggle on amp

  • OPTION button engages the MID/BOOST option on amplifier. The toggle switch on the amp must be in the down or off position for the foot switch to work.

Tube Compliment:

  • 100 Watt 6L6WGC x 4

  • 50 Watt 6L6WGC x 2

  • 12AX7 x 5

  • 12AT7 x 1

Specs:

  • Head Dimensions - 20.5”W x 12”H x 10.5”D

  • Weight 40lbs (50 Watt)

  • Weight 43lbs (100 Watt)