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Table of Contents
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Summary of Contents for SCIENCE MOTHER
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Page 2: Table Of Contents
Contents Intro Front Panel Rear Panel Speaker Jacks and Impedance Selector Footswitch Jack Ghost Effects Loop (optional) Tube Life & Biasing Preamp Tubes Output Tubes Changing Output Tubes Bias Control & Test Points Bias Measuring & Biasing Procedure What you’ll need: Biasing Procedure Measuring &... -
Page 3: Intro
Intro Thank you for purchasing the Mother MkIII Dual Channel amplifier! This manual covers the amp’s different features, maintenance, and warranty information in detail. Front Panel Input Jack: Standard 1/4” mono input for your guitar or bass. Gain A: Controls the overall gain of Channel A, ranging from clean to crunch. -
Page 4: Rear Panel
Absence: Turn clockwise to smooth out the upper harmonics, especially in distorted sounds, and turn counter-clockwise to bring the sound forward and add top-end and bite. Loudness A: Adjusts the overall volume of Channel A. Loudness B: Adjusts the overall volume of Channel B. OFF/ STBY (Standby) /ON Switch: 3-Way switch. -
Page 5: Speaker Jacks And Impedance Selector
Your amp is fitted with fuses for safety as well as protection for the amplifier’s most expensive components. Fuses are user-replaceable, and if a fuse does need changing, always replace it with the correct type and rating (as designated on the rear panel of the amplifier). To check if a fuse is blown, turn the amplifier OFF and remove the IEC cable. -
Page 6: Footswitch Jack
same impedance (i.e. two 8 ohm cabs), and the impedance selector should be set for half each cab's impedance. For example: ● When using two 8 ohm cabs: Set the impedance selector should be set to 4 ohms. ● When using two 16 ohm cabs: Set the impedance selector should be set to 8 ohms. ●... -
Page 7: Tube Life & Biasing
Tip: The effects loop interfaces your amp with the “outside world”, and sending the sensitive audio signal out to your pedal board and back is no small task! The effects loop is buffered (and hopefully the last pedal in your chain is too) making it less susceptible to noise interference, the send and return cable specifically are prone to noise pickup. -
Page 8: Changing Output Tubes
It's sometimes possible to see in plain sight which output tube(s) is (are) damaged. If necessary, remove the output tubes to inspect them, grabbing the plastic base and gently pulling up in a shallow circular motion. Here are things to look for: ●... -
Page 9: Bias Control & Test Points
Bias Control & Test Points Every Science Amplifier comes equipped with user-accessible bias test points and bias control located on top of the chassis, adjacent to the output tubes. They can be accessed by removing the rear panel of the amplifier. -
Page 10: What You'll Need
Science Amplification is not responsible for output tube failure due to maladjustment of the bias control. Please familiarize yourself with the bias procedure before making bias adjustments. If you feel uncomfortable making adjustments, take the amp to a qualified technician. -
Page 11: Changing Output Tubes
2. With a speaker cabinet or load plugged in, turn the amp to Standby, let it warm up for about 1 minute, then turn ON. 3. Set your multimeter to DC millivolts (mV). 4. Insert the negative/common test probe into the black test point (ground). On 100W and 200W models use the black test point that is adjacent to the tubes you are measuring. -
Page 12: Safety
Limited Lifetime Warranty Science Amplifiers are warranted to be free from defects in workmanship for the lifetime of the original owner. Electronic components such as capacitors, resistors, transformers, jacks, and potentiometers are warranted for 3 years (not including tubes, see below). Any part determined... -
Page 13: Care And Maintenance
The cost of return shipping to Science Amplification is to be prepaid by the owner. Science Amplification is not responsible for damage caused in return shipping. Science Amplification will pay for the shipping back to the customer after the warranty work is completed. -
Page 14: Tube & Bias Diagram
Tube & Bias Diagram Birds-eye view of the Mother's tube layout and bias controls:...
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