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Andrews Amplification AC25 Operation Manual

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AC25
OPERATION MANUAL
12-2-18

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Summary of Contents for Andrews Amplification AC25

  • Page 1 AC25 OPERATION MANUAL 12-2-18...
  • Page 3 Thank you for purchasing an Andrews Amplifier. The AC25 is 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.
  • Page 4 Tube ventilation is improved compared to vintage designs. • CUSTOMIZABLE GAIN - The AC25 contains a “trim pot” to alter the range of the gain of the amp. For those who prefer a cleaner tone or for those who prefer more overdrive, in internal adjustment is provided.

  • Page 5: Warnings And Precautions

    Warnings and Precautions 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.

  • Page 6: Front Panel

    Front Panel 1. INPUT JACKS – For maximum versatility, we have provided two input jacks (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.

  • Page 7: Pilot Light

    8. OUTPUT POWER SWITCH – The high-power setting selects all four EL84 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.

  • Page 8: Rear Panel

    Rear Panel 1. POWER CONNECTOR & FUSE – Always use correctly rated 3 amp slow 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.

  • Page 9: Tube Replacement

    Always unplug the amplifier and allow the tubes to cool completely before 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”.

  • Page 10: Limited Warranty

    LIMITED WARRANTY – Valid in USA and Canada only 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.

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