Table of Contents: The Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4,5 The Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Important Information About Tubes and Tube Products A Brief History Of The Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Tube Types And Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7,8 The Nature Of Tubes: Why (And When) To Replace Them . . . . .
Declaration Of Conformity #35, Effective 01-01-2001 Manufacturer’s Name: Production Facility: Production Facility: Shipping Facility: Office Facility: SLM Electronics 11880 Borman Drive, St. Louis, MO 63146, USA 700 Hwy 202 W, Yellville, AR 72687, USA 1400 Ferguson Ave., St. Louis, MO 63133, USA 1400 Ferguson Ave., St. Louis, MO 63133, USA Product Type: Audio Amplifier Complies with the following Standards: Safety: EN60065, E60065, C22.
1 2 3 4 CLEAN CHANNEL 5 6 7 8 BOTH CHANNELS OVERDRIVE CHANNEL The Front Panel: 1. Guitar Input: Connect your instrument here 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: Connect your instrument here by means of a shielded signal cable.
9 10 11 12 13 14 15 16 17 18 19 BOTH CHANNELS 12. Line Out: Use this jack to: (1) send a line-level signal to the input of an external effect for additional signal processing, or (2) send a line-level signal to an external amplifier, recording console or mixing board. 13. Line In: Use this jack to: (1) return the processed signal from the output of an external effect, or (2) send a line-level signal into the amplifier when using it as a “slave” or extension amp. 14. Footswitch, Ch./Rev.
21 20 23 22 The Rear Panel: 20. AC Line Cord: The grounded power cord should only be plugged into a grounded power outlet that meets all applicable electrical codes and is compatible with the voltage, power, and frequency requirements stated on the rear panel. Do not attempt to defeat the safety ground connection. 21: Fuse: The fuse protects the amplifier from damages caused by a faulty AC power source and/or other problems. If the fuse blows, replace it ONLY with the same size and type.
Important Information About Tubes and Tube Products: A Brief History Of The Tube: In 1883, Edison discovered that electrons would flow from a suspended filament when enclosed in an evacuated lamp. Years later, in 1905, Fleming expanded on Edison's discovery and created the "Fleming Valve". Then, in 1907, Dr. Lee de Forest added a third component – the grid – to the "Fleming's Valve" and the vacuum tube was a fact of life. The door to electronic amplification was now open.
Important Information About Tubes and Tube 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 offer a more traditional "American Rock" sound. The 6V6 tubes produce a creamy sound with nice distortion.
Important Information About Tubes and Tube Products (Continued): You 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). You will be able to hear the tapping through your speakers, which is normal. It is not normal for a tube to ring like a bell after it’s tapped. If it does ring then it’s microphonic and should be replaced.
Important Information About Tubes and Tube Products (Continued): Survival Tips For Tube Amplifiers: To prolong tube life, observe these tips and recommendations: • Match the impedance of your speaker cabinet(s) to your amplifier. Improper impedance matching will contribute to early tube degradation and may cause premature tube failure. • Make sure the speaker(s) are properly connected prior to turning on the amplifier.
System Block Diagram: GUITAR INPUT 12AX7A V1 12AX7A V1 12AX7A V2 GAIN TREMOLO 12AX7A OSCILLATOR V2 VOLUME SPEED INTENSITY TREBLE MID BASS ACCORDIAN INPUT MASTER CHANNEL SELECT 12AX7A PHASE SPLITTER V3 16 LINE OUT LINE IN IMPEDANCE SELECTOR 8 SPEAKER OUTPUTS REVERB 11
SR-212RT TECHNICAL SPECIFICATIONS OUTPUT POWER RATING 100 Watts RMS @ 6 % THD 16 ohm load 120 VAC SIGNAL TO NOISE RATIO 65dB Typical GAIN 84 dB Clean channel, 95 dB Overdrive channel TREBLE 22 dB Range @ 10 kHz MID 5 dB Range @ 500 Hz BASS 15 dB Range @ 150 Hz SPEAKER SPECS 2 X 12” Celestion Vintage 30, 70 w, 8 ohm, 1.75” voice coil diameter, 50 oz.
