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Intro

Thank you for purchasing the Street Sweeper MkII amplifier! This manual covers the amp’s 

different features, maintenance, tube, and warranty information in detail.

Front Panel

Input Jack: ¼” jack for your guitar.

Gain: Controls the overall gain of the amplifier, ranging from crystal clean to vintage crunch. 

Voice: 4-Way Rotary switch, that alters the voicing of the amplifier. The Voice switch interacts 

with 3-band EQ section, changing their frequency response. Position 1 (most counter-
clockwise) provides classic balanced American clean tones with open mids and round lows 

and increased headroom; Position 2 adds treble brilliance to the voicing of Position I; Position 3
has a similar tonality to Position 1, but is slightly thicker and with more gain available; and 

Position 4 adds gain, lower-mids, and upper-mids to the tone for a more “British” tone. 

Treble: Adds treble frequencies when turned clock-wise, and reduces treble when turned 

counter-clockwise.

Middle: Adds mid-range frequencies when turned clock-wise, and reduces mid-range when 
turned counter-clockwise.

Bass: Adds bass frequencies when turned clock-wise, and reduces bass when turned counter-

clockwise.

Reverb Section

The Street Sweeper features two independent 2-control reverb sections that can be switched 
between or bypassed via the 2-button footswitch. With no footswitch plugged in, only Reverb 

I

 

is active by default. (

Note: Both reverbs are voiced identically, so no functionality is lost). 

To 

mute the the reverb entirely with no footswitch plugged in, simply turn Reverb I's “Level” 

control to minimun (fully counter-clockwise). 

With the footswitch plugged in, both reverbs become active. Button 1 (left) turns on or 

bypasses both reverbs. Button 2 (right) switches between Reverb I and Reverb II.

Tip: While in bypass/off mode, you can you Button 2 to pre-select Reverb I or Reverb II!

Level I: Adjusts the overall amount of reverberation for Reverb I.

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Summary of Contents for Street Sweeper MkII

Page 1: ......

Page 2: ...Contents Intro 1 Front Panel 1 Rear Panel 2 Tube Life Biasing 5 Safety 9 Limited Lifetime Warranty 10 Care and Maintenance 1 1 Tube Bias Diagram 1 1...

Page 3: ...ble Adds treble frequencies when turned clock wise and reduces treble when turned counter clockwise Middle Adds mid range frequencies when turned clock wise and reduces mid range when turned counter c...

Page 4: ...re but in reverse order allowing the amp to idle in Standby mode for about 30 seconds before powering down While it is perfectly okay to turn the amp OFF immediately idling in standby before powering...

Page 5: ...n pairs a nd if an output tube fuse blows power is cut off to one pair of the four KT88 output tubes even though only one is likely damaged This allows the amp continue to run safely on the remaining...

Page 6: ...y are best placed in the effects loop The effects loop is located after the preamp section of the amp where most of the overdrive distorted tone is generated This allows time based effects to be be he...

Page 7: ...depending on how hard the amp is played Sometimes they die gracefully sometimes abruptly causing a fuse to blow which in turn protects the amplifier from further damage It s sometimes possible to see...

Page 8: ...detailed information about your amp s biasing system and bias procedure in the following sections Bias Control Test Points Every Science Amplifier comes equipped with user accessible bias test points...

Page 9: ...ed for a sustained period the output tubes will likely fail Science Amplification is not responsible for output tube failure due to maladjustment of bias controls Please familiarize yourself with the...

Page 10: ...t to the tubes you are measuring 5 Plug the positive probe into the red test point behind the tube you are measuring 6 Take note of the reading on the meter 7 Remove the probe from the red point and r...

Page 11: ...inimum All the way counter clockwise 4 Follow steps 2 7 from the Measuring Adjusting Output Tube Bias instructions above 1 Turn the bias control clock wise with a small screwdriver until you reach the...

Page 12: ...o the original owner Any unauthorized repair modification or tampering voids this warranty The warranty excludes Normal wear and tear worn out tubes jacks cosmetic damage etc Misuse and abuse operatin...

Page 13: ...need cleaning use only a soft clean dry or damp cloth to wipe off smudges To clean tolex wipe with a damp cloth Periodically check the 4 mounting screws on the bottom to make sure they are tightened...

Page 14: ...12...

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