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Table of Contents
Summary of Contents for andreus A-22
- Page 1 OPERATION MANUAL Model A-22 Head and Combo 08/10...
- Page 3 Thank you for purchasing an Andrews Amplifier. The Model A-22 is built to the highest standards of craftsmanship and is finely tuned for the ultimate tone. This amp is very simple to operate but we suggest reading this short manual in order to get the most from your...
- Page 4 • ALL HAND-WIRED CONSTRUCTION – Also sometimes called “point-to- point” wiring, the A-22 utilizes a very high quality turret board made of super-tough G10 composite. This glass-epoxy laminate is specified for its extremely high strength and high dimensional stability over...
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Page 5: Warnings And Precautions
Warnings and Precautions Vacuum tubes generate a lot of heat. Do not touch hot tubes. Insure plenty of ventilation behind the amp. Keep away from curtains and other flammable objects. Keep the amplifier away from children. Do not expose your amplifier to rain. Never set any cups, glasses, bottles or cans of liquid on your amplifier. -
Page 6: Front Panel
Front Panel 1. INPUT JACKS – For maximum versatility, we have provided two input jacks (labeled HIGH and LOW). For maximum overdrive, use the HIGH jack. For a more usable range of clean and crunch tones, try the LOW jack, especially with high output pickups or noisy pedal boards. -
Page 7: Master Volume Control
6. MASTER VOLUME CONTROL – This control is designed to be very versatile. Used in conjunction with the VOLUME control and HIGH or LOW inputs, you can obtain varying levels of overdrive at different volumes. Full output power can be achieved with at a setting of 8.5 - 10 Try experimenting within this range to get subtle tonal differences. -
Page 8: Rear Panel
PRESENCE and/or TREBLE controls. IMPEDANCE SELECTOR – Always set this switch to the proper speaker load according to the chart below. Note: The A-22 combo incorporates a built-in 8 ohm speaker so leave it set to 8 when not connecting another cabinet. - Page 9 Convertible Cabinet (specific versions only) The cabinet back features a removable center-section to allow for more tonal versatility. When the center-section is left in place, the cabinet will function as a closed-back speaker enclosure. In this mode, the sound will be more focused or directional and the bass response will be tighter.
- Page 10 FOR TECHNICAL TYPES We have provided this information for those who have a technical interest, proper equipment and proper training in dealing with high voltage circuits. GUITAR AMPLIFIERS CONTAIN LETHAL VOLTAGES. If you have any doubt about your ability to safely perform this procedure, refer the job to a qualified technician! Bias Adjustment Procedure: Precautions:...
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Page 11: Tube Replacement
TUBE REPLACEMENT Precautions: Always unplug the amplifier and allow the tubes to cool completely before touching them. After years of experience with various available tubes, we have chosen specific tubes for this amp. This decision has been made for tone and reliability reasons. You can safely replace any of the three preamp tubes any time without concern about biasing. -
Page 12: Limited Warranty
LIMITED WARRANTY – Valid in USA and Canada only Andrews Amp Lab warrants this product to be free of defects in materials and workmanship for a period of 5 years from the original date of purchase to the original purchaser. For subsequent owners, the length of warranty shall be for a period of 1 year from the original date of purchase.
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