Bob Carver CHERRY 180 User Manual Download Page 7

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Cherry 180W Mono Block Amplifier Specifications 

  
 
Number of  Line Inputs 

Input impedance 

100 k ohms 

Input Stage 

12AX7 current sourced long tailed balanced pair 

Pre-driver Stage 

12AT7 current sourced long tailed balanced pair 

Automatic DC Restoration 

6AL5 

Nominal Voltage Gain 

30 dB (into 8 ohms) 

Output Stage Configuration 

3 complimentary sets of KT88s in a push-pull configuration (6 total) 

Regulated Screen Supply Voltage 

360V 

Output tube plate voltage 

725V 

Output tube Idle Power 

Less than 10W each 

Bias Adjustment 

Rear panel pot, front panel meter, set and forget 

Rated Power 

200 watts into 8 ohms, 230 watts into four ohms, 215 watts into 
two ohms 

Noise 

Better than 110 dB A Weighted referenced into 180 watts 

Hum 

-100 dB 

Frequency Response 

2 Hz to 85 kHz. (-3dB) 

Full Power Bandwidth 

24 Hz to 28 kHz. Without filters 

Feedback Control Switch 

20dB for Classic Amplifier Sound 

 

11 dB for Contemporary Amplifier Sound 

Distortion 

Less than 0.5% 

Output Transformer 

Interleaved windings, super wideband low leakage inductance design 

Output Impedance 

1.3 ohms 

Speaker outputs 

2, 4, and 8 ohm terminals 

Built in Output Tube tester 

 Yes 

Construction Method 

Point-to-Point hand wired axial and radial leaded components with 
star grounds and no circuit board traces or de-plugable connectors.  

Components 

High reliability wire wound and metal film resistors 

 

Metal polyester capacitors in the audio signal paths  

Dimensions 

14” long by 12.5” wide by 7.2” tall 

Weight 

84 pounds (38 kg) for a stereo pair, 42 pounds (19 kg) each     

Color 

Cherry Red with Champaign Trim                                                               

Country of Origin: 

United States of America 

Warranty: 

Chassis - 7 Years, Tubes – 1 Year 

 

 
 
 
 

Summary of Contents for CHERRY 180

Page 1: ...mptuous and enveloping sound stage a great front to back depth of field and very tight pin point imaging within that larger acoustic A special current feedback circuit allows the amplifier to listen t...

Page 2: ...e The output tubes are arranged in push pull parallel three up three down for a total of six in all The KT88 screen grids are operated at approximately 360 volts provided by a separate power supply fo...

Page 3: ...control should be left in the maximum fully clockwise position If you have a noisy preamp turning it halfway down and centering it at the 12 00 o clock position will reduce the preamp noise by half or...

Page 4: ...in power line voltage SPEAKER CONNECTIONS From the rear view the black binding post is common and moving to the right the next red post is two ohms then four ohms and the far right post is for eight...

Page 5: ...mp sounds good all is well Often an output tube has a spec of dust like impurity which comes into contact with an internal element shorts the element and gets itself vaporized into gaseous oblivion Th...

Page 6: ...above but write down the current on each tube one at a time You will end up with six numbers The goal is to select two groups of three whose sum from any three tubes is as close as you can get to a si...

Page 7: ...0 watts Hum 100 dB Frequency Response 2 Hz to 85 kHz 3dB Full Power Bandwidth 24 Hz to 28 kHz Without filters Feedback Control Switch 20dB for Classic Amplifier Sound 11 dB for Contemporary Amplifier...

Page 8: ...ide blade and the third prong are provided for your safety If the provided plug does not fit your outlet consult an electrician for replacement of the obsolete outlet Power Cord Protection Protect the...

Page 9: ...t in fire electric shock or other hazards Safety Check Upon completion of any service or repairs to this audio product ask the service technician to perform safety checks to determine that the audio p...

Page 10: ...nty shall not apply a to equipment not manufactured by Bob Carver LLC b to equipment which has been repaired or altered by someone other than Bob Carver LLC c to equipment which shall have been subjec...

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