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A tube guitar preamp pedal with a huge range of tonal dynamics!
In order to achieve the full opening of input valve cascades working in the "hottest" conditions the giant amplitude of one hundred and more volts is necessary. The dynamic properties characteristic to valve-based preamps are implemented in the SS-20 preamp due to the elimination of signal limiting OA (feed level of 20-25V) in the part of preliminary amplification and using special cascades capable of reaching 250V amplitude with nonlinearity similar to a 12AX7 triode. Thus, AMT has managed to achieve full dynamic characteristics of guitar signal without usual hybrid "squeeze" as well as assign special sound character to SS-20.
Special attention was also paid to to the SS-20's clean channel-in this section AMT has also followed the way of preserving the dynamics of guitar signal with simultaneous formation of soft "nonlinearity" inherent in the cascades on vacuum triodes. It also allowed us to escape both the "squeeze" and "refinement" peculiar to many clean-channels of hybrid devices.
The basis of the inner preamp structure is the principle of maximum use of amplification and nonlinear transformation of the valve part of the device. Thus, the semi-conductor part of the hybrid practically does not participate in the sound limitation (except for the use of preamp in LEAD mode at Gain LEAD level of higher than 7) and the entire spectrum is formed by the valve preamp part. In the preamp stage the quantity of semi-conductor cascades is not used in the sound processing, and in the absence of jacks in SEND and RETURN the signal is forwarded to OUTPUT through compensating circuits directly from the output triode cascade. Therefore it is advised to use high quality minimum length cables for connecting the preamp output with guitar amplifier input.
The SS-20 guitar preamp uses the original cabinet emulator, however, ONLY in direct out mode. It models the amplitude-frequency characteristics of guitar amplification systems for the most accurate reproduction and ease of recording direct. Secondly, it simulates own nonlinearity of dynamic head peculiar to instrumental loudspeakers, that in its turn colors the output signal with short-range harmonics making it live and closer to real. AMT's unique speaker emulator circuitry supplements the signal with 2nd and 3rd harmonic with smooth increase in their level at signal level growth (it actually is similar to instrumental head in the closed cabinet), not found on other manufacturers pedals.
- Two high-grade channels CLEAN and DRIVE with the possibility of Drive-channel operation in two basic modes: moderate sensitivity (CRUNCH) and high sensitivity (LEAD).
- Effects Loop Send and Return.
- Operation via both direct unaltered signal for guitar amplifiers heads, combos, and speakers (OUTPUT jack) as well as speaker cabinet compensated output for mixing consoles, computers, or other recording devices.
- Cabinet emulator in direct out mode
- High-grade high-voltage feed of triodes.
- Complete elimination of operational amplifiers traditionally used in hybrid preamps for sound amplification and processing.
- Application of special semi-conductor amplifiers modeling triode-based harmonics and providing signal amplitude necessary for high-grade valve operation.
Tube Guitar Series SS-20 Guitar Preamp Specifications:
- Power: External Adaptor AC 120V 12V DC .8A (included)
- Tubes: 1 x 12AX7 Incandescence - 12.6V (6.3V)
- Anode Voltage: DC 290V
- Amplifier Output - for Combo Connection
- Mixer Output - for Mixer/Recorder Connection
- Effects Loop Send and Return
- Input In
- Bypass: Left F Switch - DRIVE effect on/off
- Right F Switch - DISTORTION effect on/off
- Free Standard Ground shipping (48 contiguous states, some overweight and Used/Vintage items excluded).
- Orders placed before 3 p.m. ET usually ship the same business day.
Every guitar or bass you purchase from Musician's Friend (electric or acoustic, New or Open Box) includes two years of protection from manufacturer defects.
Our Gear Advisers are available to guide you through your entire shopping experience. Call or Chat for expert advice and to hear the latest deals.