Stereo Simul-Class 295 Operating Manual 1
Congratulations! You are now the owner of an innovative yet classic kind of power amplifier, designed and built exclusively for the guitarist: the Stereo Simul-Class 295. Like all MESA/Boogie amps, it's an all-tube circuit, because there just isn't a better-sounding way to build a guitar amp. And it features our patented "Simul-Class" circuitry, which combines two separate and different kinds of amplification - "vintage" Class A and "modern" Class AB power - on the same chassis.
INPUT CONNECTIONS. Each channel of the 295 has one 1/4” input jack. In addition, a separate 1/4” jack on the rear deck of the chassis (labeled "Parallel Inputs A & B") offers access to both channels simultaneously. It is vital when using this jack that both channels be connected to separate speaker loads, or damage to the output tubesnand/or transformer may result.
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).
BIAS. As with all MESA/Boogie amplifiers, the bias is permanently set during construction and never needs adjustment. This saves you any technician's fee for readjustment when replacing tubes, and prevents the bias from "wandering" or being accidentally set improperly. DRIVER TUBES. The four small tubes are all type 12AX7A, also known as 7025 or ECC83.
