Bedienungsanleitung Mesa Boogie Stereo Simul Class 295

Mesa Boogie Stereo Simul Class 295



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Mesa Boogie 

  • Power Amplifier Mesa Boogie Stereo Simul Class 295

  • Vorschau Mesa Boogie Stereo Simul Class 295 Handbuch:
    CLASS A / SIMUL-CLASS SWITCHES. These two rocker switches on the 295's rear deck (again, one per channel) allow selection of either the "Class A” Mode or the "Simul-Class" Mode. In Class A, the outer or end pairs of power tubes (EL-34's) operate by themselves, while the inner or middle pairs (6L6's) remain in "standby". The EL-34's are wired in a "Class A Triode" circuit for optimal warmth of tone, and at lower output levels (about 30 watts per channel). The Class A mode is ideal for recording, rehearsing, or any situation where you need great tone at low volumes. In the "Simul-Class" Mode, all eight power tubes are operative (with the 6L6's adding about 65 watts of "Class AB" type power per channel) to produce a total of 95 watts per channel. It's this combination of "Class A" warmth and "Class AB" efficiency that makes the Simul-Class 295 ideally suited as an instrument for guitar amplification. POWER TUBES. The power tubes used in the 295 are MESA STR-420 type 6L6 GC's, and MESA STR-440 type EL-34's. All MESA tubes are tested under high-voltage conditions and installed in closely matched pairs. The 6L6's we use have very low 3rd harmonic output when overdriven. The four inside sockets on the 295 should be fitted with these 6L6's. The EL-34 tubes are characterized by a more prominent harmonic output when driven hard; this produces a brighter, more "grinding" high-end, usually preferred for guitar. The EL-34's are used in the four outside or end sockets in the 295. You can expect 6 months to 2 years (or more) of outstanding performance from your MESA power tubes, depending on use. Tube wear is gradual and usually goes unnoticed until new replacements are installed. Worn power tubes tend to sound flat with reduced punch, clarity and high end. Occasional loss of power or sporadic blowing of fuses is nearly always caused by troublesome power tubes. Often, you can spot the tube at fault and replace it alone, at considerable savings over replacing all the output tubes. A tube that arcs or "flashes over" inside should be replaced immediately. (In an emergency, you can just remove the bad tube and go on with the show..."running on five cylinders."). Sometimes a tube will "short out" intermittently, turning red-hot all over the large metal plate inside, but usually a momentary switching off of the Standby or Power Switch will enable the tube to straighten out its electron flow and return to proper operation. Should this happen repeatedly, careful observation will usually reveal which tube is shorting, even though one or two others may also turn red-hot after a few moments. Try to see which one is reddest or .....
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