Instruction/ maintenance manual of the product SJ-12T Ampeg
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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 .
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 .
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).
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.
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.
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".
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.
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).
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.
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 S.
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.
An important point after buying a device Ampeg SJ-12T (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Ampeg SJ-12T yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Ampeg SJ-12T - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Ampeg SJ-12T you will learn all the available features of the product, as well as information on its operation. The information that you get Ampeg SJ-12T will certainly help you make a decision on the purchase.
If you already are a holder of Ampeg SJ-12T, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Ampeg SJ-12T.
However, one of the most important roles played by the user manual is to help in solving problems with Ampeg SJ-12T. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Ampeg SJ-12T along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
