JBL Model 6260 Power Amplifier C-Ware

JBL Model 6260 Power Amplifier C-Ware Product Details

Description

Professional Vintage Power Amplifier from the mid 80's

JBL power amplifiers have been designed to meet the most critical professional sound requirements. They are rugged and road-worthy, conservatively rated, and can handle highly reactive loads with ease. The engineering design approach stresses the optimization of each stage, allowing high slew rate and relatively low loop gain. Overall feedback has been held to a minimum and is employed only to stabilize the gain and the operating point. This design approach results in amplifiers with excellent performance under the most demanding dynamic input and load conditions. As evidence of the stress on dynamic rather than static or steady-state distortion mechanisms, transient intermodulation distortion measures less than 0.03% by the DIM 100 test. (Leinonen, Otala, and Curl, “A Method for Measuring Transient Jntermodulation Distortion (TIM),” Journal of the Audio Engineering Society, Vol. 25, No. 4, April, 1977, pp. 170- 177.) The heat sinks of the amplifiers are made of heavy aluminum extrusions; the chassis is fabricated of heavy gauge steel. All internal components are easily accessible through removal of top and bottom panels. Front panel graphic details are incorporated on the rear side of a polycarbonate laminate which is virtually indestructible.

The 6230,6260 and 6290 use multiple 200-watt output devices in complementary configuration for high reliability and low distortion. At rated power into 8 ohms, these output devices are operated at less than 35% of their rated power dissipation. The benefit is high reliability and long component life. The 6215,6230 and 6260 employ a continuous duty power supply section common to both channels. The 6290 has two totally independent power supplies with separate power switches and fusing. Reliable operation of these amplifiers is ensured through the following protection modes: Current is limited under improper load or drive conditions. Output relays, with front panel LED indication, protect the loudspeaker load under conditions of DC offset or large low-frequency transients. The relays also provide power-up, power-down, and “brown out” muting to protect loudspeakers from AC power transients generated anywhere in the signal path. LED’s on the front panel indicate the onset of clipping and standby mode. The JBL amplifiers may be operated in the normal stereophonic mode, dual monophonic mode, or bridged monophonic mode. A rear panel switch sets these modes, eliminating the need for patch cords or adaptors.

Active differential input circuitry offers the benefits of balanced operation without the use of input transformers. Input connections may be made via 3-pin XL-type connector, three-conductor TRS 6.3 mm (‘1’i4n ) Jack, or barrier strip. The barrier strip includes a ground strap which can be removed to isolate the circuit ground from chassis ground. The five-way output binding posts are arranged in a 19 mm (31 in) array so that bridged as well as normal connections may be made with standard dual banana plugs, bare wire, or terminal Jugs. The 6215, 6230 and 6260 models are cooled by natural convection and the 6290 has a quiet twospeed fan for extra thermal protection when the “heat is on.”

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