Andrews Amplification AC25 Operation Manual

designed to deliver classic British “Class A” tones while providing greater versatility and improved reliability. As with all Andrews amps, these models are built to the highest standards of craftsmanship and are finely tuned for the ultimate tone. This manual will help you to get the most from your new amp. Please feel free to contact us with any questions at andrewsamps.com ...

the Spectraverb amps utilize a very high-quality turret board made of super- tough G10 composite. This glass-epoxy laminate is specified for its extremely high strength and dimensional stability over temperature. The extra-thick board material will never warp or melt, and there are no copper traces to peal away from the board over time. All wiring and soldering ...

During operation, vacuum tubes can reach temperatures over 400 degrees F. Do not touch hot tubes. Insure plenty of ventilation behind the amp. Keep the amp away from children as well as curtains and other flammable objects. Do not expose your amplifier to rain. Never set any cups, glasses, bottles or cans of liquid on your amplifier. Do not use any solvents to clean your amplifier. Never operate your amplifier without a proper s ...

(labeled High and Low). The HI jack provides a bit more drive and sensitivity. The LO jack provides a slight (6dB) attenuation and is useful when a cleaner and slightly darker tone is desired, especially with high output pickups. 2. VOLUME CONTROL – Use this control to adjust the volume and gain of the amp. Try using the other input jack to widen the range of the ...

output tubes and produces about 25 watts. Switching to low power turns off two of the output tubes and produces 10 or 14 watts. Turning off two tubes actually changes the output impedance of the amp. To compensate, it is recommended to move the speaker plug from the 8 ohm jack to the 4 ohm jack. Doing so will allow the amp run most efficiently in the low power setting and will produc ...

blow fuse or severe damage to the amp may occur. Always unplug the amp before replacing any fuses. The main AC fuse is located in the AC cord jack. Use a small screwdriver to remove the fuse holder. 2. SPEAKER JACKS – Three speaker jacks are provided. One each for 4, 8 and 16 ohms. The built-in speaker is rated at 8 ohms so it should normally be plugged into the 8 ohm jack b ...

touching them. The AC25 is designed with cathode biasing. This means bias adjustments are not necessary when replacing tubes. When purchasing EL84 output tubes, be sure to purchase matched quads and replace all four together. Also, for maximum tube life, request a set with “lower plate current”. When to replace tubes: Preamp tubes such as 12AX7 wil ...

Andrews Amp Lab Inc. warrants this product to be free of defects in materials and workmanship for a period of five (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. During the warranty period, in the unlikely event that a defect occurs, Andrews Amp Lab will at its discre ...