Bob Carver Crimson 275 Stereo Operating Manual
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Bob Carver Crimson 275 Stereo Operating Manual

Vacuum tube amp
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Operating Manual
c02-15-19

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Summary of Contents for Bob Carver Crimson 275 Stereo

  • Page 1 Operating Manual c02-15-19...
  • Page 2 6. Clean only with a dry cloth. or objects have fallen into the apparatus, the apparatus has been 7. Install in accordance with the Bob Carver Company instructions. exposed to rain or moisture, does not operate normally, or has 8. Do not install in close proximity to heat sources such as radiators, been dropped.
  • Page 3 12AT7 12AX7 12AT7 Quick Start Guide KT120 KT120 KT120 KT120 Locate the seven vacuum tube boxes, four large and three small. Place the Crimson 275 according to the ventilation suggestions on page 6 of this manual. Carefully insert the tubes into their sockets following the diagram at right and the further details on page 00 of this manual.
  • Page 4 Worse yet, tube performance begins to deteriorate as soon as the amp is turned on. enlarged bitmap (JPG) In addition to extended tube life, Bob Carver Company’s DC Restorer eliminates the need to purchase expensive matched tubes for the Crimson 275.

  • Page 5: Technical Assistance

    If you or your please record the serial number, purchase date Dealer wish additional help concerning a sus- and Bob Carver Company Dealer name in the pected problem, we’re here in rainy Snohomish, spaces provided.

  • Page 6: Placement And Cooling

    Placement and Cooling 12AT7 12AX7 12AT7 Cool air is drawn from under the chassis by the heat from the tubes acting as an air pump, and KT120 KT120 KT120 KT120 exhausting the warm air out the chassis through the vents. Place the amp on a hard surface.
  • Page 7 The only caveat here is that the output tubes spite Bob Carver specifying esoteric steel for their should all be the same type and vintage. cores, it helps us sell a $4000+ amplifier for un- Looking at the amplifier from the front, left der $3000.

  • Page 8: General Operation

    General Operation. The Crimson 275 speaker terminals will accept spade lugs, banana plugs or bare wire. Bob has intentionally made the Crimson 275 If using bare wire, remove half an inch of insu- extremely simple to operate. Volume (gain) is lation and tightly twist the wire strands together.

  • Page 9: Input Connections

    Input Connections. (B+) is a 1.0 ampere and should be replaced with the same type and rating. If the fuse blows during The red RCA-type input is for the right chan- bench testing, it may be temporarily replaced with nel; black is for the left channel. As with speaker a 1.25 or 1.5 ampere fuse.
  • Page 10 your starting point if you want internal element, shorting the element, and is to experiment. It will vary from vaporized into gaseous oblivion. The getter, the speaker to speaker, and most mirror-like shiny plating on the inside of the tube importantly with your does its job, absorbs the vaporized material and taste.

  • Page 11: Circuit Description

    Tube Tester select two groups of two whose sum (from any two tubes) is as close as you can get to the other The front panel meter may be used to test the group of two tubes. tubes. • Install the first group in sockets One and Two. •...
  • Page 12 The output tubes are arranged in push-pull parallel, four in all. The screen grids are operated at approximately 340 Volts provid- ed by a separate power supply formed by one-half of a voltage doubler supplying the plates with 685 Volts. The power supply consists of a large power transformer, with energy storage that is far great-...
  • Page 13 Crimson 275 Amplifier Schematic...

  • Page 14: Specifications

    Limited Warranty Country of Origin shall be to return the product to their Bob Carver Compa- ny dealer. IF they cannot contact or reach their dealer, the owner should directly contract Bob Carver Company and obtain a Return Authorization approval.
  • Page 15 TRANSFER OF WARRANTY the customer at his or her sole expense. Bob Carver Com- pany will pay return freight of its choice.  This Warranty is transferrable from the original pur- chaser of the covered product. MISCELLANEOUS IMPORTANT: The new owner must receive a copy of the...

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