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Ampeg SJ-12T manual

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Table of contents for the manual

  • Page 1

    [...]

  • Page 2

    T able of Contents: The Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4,5 The Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Important Information About T ubes and T ube Products A Brief History Of The T ube . . . . . . . . . . . . . . . . . . . . . . [...]

  • Page 3

    3 IMPORT ANT SAFETY INSTRUCTIONS • READ, FOLLOW , HEED, AND KEEP ALL INSTRUCTIONS AND WARNINGS. • DO NOT OPERA TE NEAR ANY HEA T SOURCE AND DO NOT BLOCK ANY VENTILA TION OPENINGS ON THIS APP ARA TUS. FOR PROPER OPERA TION, THIS UNIT REQUIRES 3” (75mm) OF WELL VENTILA TED SP ACE AROUND HEA TSINKS AND OTHER AIR FLOW PROVISIONS IN THE CABINET . [...]

  • Page 4

    4 1. Guitar Input accepts the output from your instrument by means of a shielded signal cable. This input signal to this jack is not attenuated and accommodates instruments with standard output signals. If your instrument has a strong output signal, use the Accordion Input (#2). 2. Accordion Input accepts the output from your instrument by means of[...]

  • Page 5

    5 6. T remolo-Intensity sets the depth of the tremolo effect. For slow , smoother vibrato effects try the Intensity control at around 6 and the Speed control at 1. For the really wild sounds, crank the Intensity up towards 8 (or beyond) and go from there. 7. Reverb-Dimension controls the amount of reverberation applied to the signal. With the contr[...]

  • Page 6

    6 (Reverb cables: do not disturb) (Reverb cables: do not disturb) 13 14 15 10 11 12 10. Power cord connects the amplifier to a suitable source of A.C. voltage. This is a grounded, three-wire cord and must be connected to a properly grounded outlet. DO NOT attempt to defeat the ground connection of the power cord! If your amp was purchased outside o[...]

  • Page 7

    7 Important Information About T ubes and T ube Products: A Brief History Of The T ube: In 1883, Edison discovered that electrons would flow from a suspended filament when enclosed in an evac- uated lamp. Y ears later , in 1905, Fleming expanded on Edison's discovery and created the "Fleming V alve". Then, in 1907, Dr . Lee de Forest [...]

  • Page 8

    8 Important Information About T ubes and T ube Products (Continued): low-end response and produces more harmonics at mid and high frequencies ("creamier" sound). These differences become more noticeable at higher volumes. The 6L6 tubes produce a big low-end thump and have a very good dynamic range. They of fer a more tradi- tional "A[...]

  • Page 9

    9 Important Information About T ubes and T ube Products (Continued): Y ou can check your preamplifier tubes for microphonics by turning the amplifier on, turning up the gain and tapping lightly on each tube with the end of a pencil or a chop stick (my favorite). Y ou will be able to hear the tapping through your speakers, which is normal. It is not[...]

  • Page 10

    10 Important Information About T ubes and T ube Products (Continued): Survival T ips For T ube Amplifiers: T o prolong tube life, observe these tips and recommendations: • Match the impedance of your speaker cabinet(s) to your amplifier . Improper impedance matching will con- tribute to early tube degradation and may cause premature tube failure.[...]

  • Page 11

    11 System Block Diagram: GUITAR INPUT VOLUME TONE ACCORDIAN INPUT 12AX7A V1A 12AX7A TREMOLO OSCILLATOR V1B REVERB INTENSITY SPEAKE R 12AX7A PHASE SPLITTER V2A 12AX7A PHASE SPLITTER V2B 6L6 V3 6L6 V4 SPEED[...]

  • Page 12

    Ampeg is proudly Made in America. A product of SLM Electronics, 1400 Ferguson Avenue, St. Louis, MO 63133 U.S.A. SJ-12T TECHNICAL SPECIFICA TIONS: OUTPUT POWER RA TING 50 W atts RMS @ 5 % THD 8 ohm load 120 V AC SIGNAL TO NOISE RA TIO 70dB T ypical GAIN 62 dB TONE 30 dB Boost and Cut @ 4 kHz SPEAKER SPECS 12”, 50 w , 8 ohm, 1.5” voice coil diam[...]