DRIVE A controls the amount of Class A power amp output stage distortion (like Vox AC30®-style amp), rich in even harmonics. The amount of harmonics is dynamically controlled by the input level and their ratio by how hard you pick.

DRIVE A/B controls the amount of Class A/B power amp output stage distortion (like Fender®/Marshall®-style amps), rich in odd harmonics.

The signal path of Drive A runs into the signal path of Drive A/B. This results in an electronic multiplication, rather than addition, of the amount of distortion to achieve a cascading effect.

Other features include:
• LEVEL is capable of extremely high output, up to 10dB (even in clean setting). Useful as a "pre-boost" for additional gain out of your amp without altering any tonal characteristics.

• 1/4" INPUT is 1megOhm high impedance input, same as traditional tube amps.

• 1/4" OUTPUT is 1kOhm low impedance output.

• Can drive long cables without loss of signal integrity, even in bypass.

• LED is highly efficient and low power consuming. It will fade as the battery runs low (±6.5V), although the Double Drive will continue to operate.

• Utilizes standard 9V alkaline battery (not included) or optional power supply:
Tech 21 Model #DC2.

• Power Consumption: approx. 5mA.

• Actual size: 3.5"l x 1.5"w x 4.5"h. Weight: 11 oz.