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Manafacture: Ampeg
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File name: Heritage_B-15_OM.pdf
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manual abstract
During short breaks this switch should be set to the Standby position to help prolong the life of the amplifier’s tubes. 10. BIAS SWITCH: With this switch, users may now select between 1964 cathode bias or 1966 fixed bias, 1964 or 1966 preamp or have the ability to mix and match. 11. ON/OFF SWITCH: Use this switch to turn the overall system power on or off. Always turn this switch ON first and OFF last! Turn the On/Standby switch [9] on at least 30 seconds after turning on the On/Off switch. Heritage B-15 Bass AmplifierHeritage B-15 Bass Amplifier Heritage B-15 Bass Amplifier Heritage B-15 Rear Panel 1213 14 15 12. IEC POWER INPUT CONNECTOR: This 15. SPEAKER OUTPUTS: These 1/4” TS is where you connect the supplied AC output jacks supply speaker-level power power cord. to the speaker cabinet. The rated power output is 30 watts rms into a 4 or 8 The MAINS fuse is located inside the IEC load. socket fuse drawer and should be left alone unless a fuse has blown. The Heritage B-15 cabinet is rated at 8 . When using a single Heritage B-15 To remove and replace the fuse: cabinet with the Heritage B-15 head, *Disconnect the power cord from the connect the cabinet to the matching 8 IEC socket. speaker output jack using a high quality *Remove the fuse drawer. speaker cable. *Remove the fuse and replace it with an When using the Heritage B-15 cabinet equivalent-type fuse (T 3.15 AL 250 V). with an additional 8 ext. speaker, connect the two (8 ) cabinets to two 13. H.T. FUSE: The HIGH TENSION fuse is 4 jacks using two high quality speaker located inside the fuse holder cap and cables. (Two 8 cabinets in parallel should be left alone unless a fuse has equal a 4 load). blown. When using the Heritage B-15 cabinet To remove and replace the fuse: with one 4 cabinet, such as a Heritage *Disconnect the power cord from the SVT-410HLF or SVT-810E, connect the IEC socket [12]. single 4 cabinet to the 4 speaker output jack using a high quality speaker *Remove the fuse by turning the fuse cable. holder cap counter-clockwise. Use speaker cables with 1/4” TS ends *Remove the fuse and replace it with an only to make the connections. Do not equivalent-type fuse (T 0.5 AL 250 V). use instrument cables as they may 14. EXT AMP: This feature was originally overheat. designed as a means to daisy-chain two or more B-15 amps together for additional power. This new-and-improved Heritage B-15 could also be used as a line out to feed an unbalanced Hi-Z input such as a direct box or a mixer. Alternately, it may be utilized as an input. Any signal applied here will not be affected by the volume controls [2, 6]. Heritage B-15 Bass Amplifier Important information about tubes A brief history of the tube: In 1883, Thomas Edison discovered that electrons would flow from a suspended filament when enclosed in an evacuated lamp. Years later, in 1905, John Ambrose 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 “Fleming’s Valve” and the vacuum tube was a fact of life. The door to electronic amplification was now open. During World War II, data gleaned from their intensive research on the detectors used in radar systems led Bell Telephone Laboratories to the invention of the transistor. This reliable little device gained quick support as the new component for amplification. The death of the vacuum tube seemed imminent as designers, scientists, and engineers reveled in the idea of replacing large, fragile glass tubes with these small, solid-state devices. However, there were (and still are) many serious listeners who realized that the sound produced by a “transistor” amplifier is significantly different from that produced by a tube amplifier with identical design specifications. They considered the sound produced by these new solid-state devices to be hard, brittle, and lifeless. It was determined that solid-state devices produced a less musical set of harmonics than tubes. When pushed past their limits, they tend to mute the tone and emphasize the distortion. Tubes, on the other hand, produce a more musical set of harmonics, the intensity of which may be controlled by the player. This characteristic adds warmth and definition to the sound which has become the hallmark of tube amplifiers. When tubes are driven into clipping, the harmonic overtones can be both sweet and pleasing or intense and penetrating, depending on the musician’s taste and playing technique. Over the years, application engineers have designed a number of outstanding solid-state amplifiers that sound very, very good. Some use special circuitry which enables them to simulate distortion characteristics of a tube amplifier. However, the tube amplifier, still held in the highest esteem by many musicians, offers a classic “vintage” sound in a contemporary market. Tube types and usage: The Ampeg Heritage B-15 contains three types of tubes: preamplifier tubes, power tubes and a rectifier tube. Preampl...