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Table of Contents
Related Manuals for RAM 285
Summary of Contents for RAM 285
- Page 1 Reference Amplifier Model 285 OWNER’S MANUAL...
- Page 2 We believe the RAM 285 is the finest in its class at any price. We look forward to hearing about your experience with this excitingly musical amplifier design. Enjoy!
- Page 3 17. The mains plug of the power supply cord shall remain readily operable. 18. Connect mains power supply cord only to a mains socket outlet with a protective grounding connection. 19. If possible, save the shipping carton that contained your RAM 285, as well as the individual tube boxes...
- Page 4 DAC is turned down. See page 8 for more hook-up instructions. 5. Connect the output terminals of the RAM 285 to your loudspeakers. See page 8 for more de- tails. 6. Connect the IEC power cable between the RAM 285 power socket and the wall receptacle.
- Page 5 Allow at least 15 inches of free space above the amplifier Inserting the Vacuum Tubes The RAM 285 comes with five small and four large vacuum tubes: Two 6AL5, Two 12AT7’s, one 12AX7, and four KT-120 output tubes.
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Page 6: General Operation
We warrant the RAM 285 for a full five years; that’s the amplifier and the tubes! We love the fact that our finest competitors warrant their tubes for three months. It’s all about economics. If your tubes tend to fail, limit the warranty. -
Page 7: Speaker Connections
10 feet or less, for longer lengths #12 is preferred The RAM 285 speaker terminals will accept spade lugs, banana plugs or bare wire. If using bare wire, remove half an inch of insulation and tightly twist the wire strands togeth- er. -
Page 9: Input Connections
Input Connections The red RCA-type input is for the right channel; black is for the left channel. As with speak- er cables, you have many esoteric options as well as “conventional” connection cables. At the very least, use high quality RCA cables with gold plating and durable cable-to-plug connections. Cheap cables can fail and lead to frustrating trouble-shooting —... -
Page 10: Power Switch
Power Switch The main power switch is located on the rear panel. It is illuminated when in the on posi- tion. Power Selector On the top panel left, you will find the 4 position power selector knob and a correspond- ing LED indicator light. -
Page 11: Tube Troubleshooting
Use a small flat screwdriver and adjust the BIAS control (located on the top right of the amplifier) for 100 mA, after the unit has warmed up for about 10 minutes. The normal range to use is from 60 mA to 120 mA, and changes here will vary the damping factor of the amplifier slightly. -
Page 12: Circuit Description
Proceed as follows: • Remove all output tubes and turn the preamp volume control all the way down. • Turn the amp on and leave it on. • While monitoring the current, put a pair of tubes into sockets Number One and Number Two. Allow one minute on the clock for the two tubes to warm up. -
Page 13: Specifications
Specifications Gain 29 dB More that 85 Watts Per Channel, both channels driven at eight ohms 20KHz to 20Hz, with no Power more than .5% Total Harmonic Distortion. Distor- tion decreases at lower levels 4Ω Power 85 watts 20Khz to 20Hz. 120w @ 1KHz 8Ω... - Page 14 BOB CARVER COMPANY LIMITED WARRANTY Bob Carver Company’s Ram 285 is covered by a five (5)-Year Limited Warranty on parts and vacuum tubes. This Limited Warranty initiates from the date of purchase, and is limited to the original purchaser, or in the case of demonstration equipment, limited to the balance of warranty remaining.
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Page 15: Duration Of Warranty
DURATION OF WARRANTY This Warranty expires on the fifth anniversary of the date of purchase . VACUUM TUBES Vacuum tubes are warranted for five years from the date of purchase. MISCELLANEOUS ANY IMPLIED WARRANTIES RELATING TO THE ABOVE PRODUCT SHALL BE LIM- ITED TO THE DURATION OF THIS WARRANTY.