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Manley Neo-Classic 300B Preamp  <  Manley Preamps & DAC's  <  Manley Hi-Fi  <  Home  
   
 

 

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  Neo-Classic 300B Preamp
Description
The 300B unit is the first HiFi preamp to feature these classic tubes. Manley's design team had been featuring the 300B in their small power amplifiers for several years and had grown to love the smooth natural sound of this tube. However, a single 300B provides great power and voltage swing for headphones and makes a remarkable line driver (where impedances are not too low and power requirements are not too high) ideal for this kind of tube in a single-ended configuration.

Manley combines the glorious 300B with another classic, the large octal based 6SL7GT, for the input stage- all triodes running in pure Class A operation. To complement this 'retro' feel, they implemented vacuum tube rectification (two 5AR4's) and regulation (two OD3's) in the power supply along with plenty of capacity, also developing an additional (and innovative) ripple rejection circuit to filter out power supply noise making this an incredibly low-noise preamplifier. Critical factors for headphone users.

Complementing this lovely rich sounding line-driver, Manley employed two ideas found in premium passive preamps: a 24 position gold contact Grayhill switch with metal-film 1% 1/2 watt resistors for a superior audio attenuator and a widely separated ceramic switch for input selection. Add to this, gold plated phono connectors, high purity copper wire, mil-spec printed circuit boards with extra thick copper and plating, and custom designed output transformers which they wind in their own magnetics department. It all adds up to glorious beautiful sound.

Finished in elegant "Manley-Blue" pewter grey the 300B chassis has a stylish retro-contemorary look. Whether you use headphones or loudspeakers this preamp will spoil you for any other preamplifier.

Specifications

  • 5 selectable inputs
  • 3 pairs of RCA outputs including TAPE direct sends
  • 2 front panel headphone jacks
  • Optimized headphone impedance switching 30-400 ohms to 300-4000 ohms
  • Selecting HEADPHONE operation mutes LlNE outputs
  • Vacuum Tubes 2 x 300B, 2 x 6SL7GT, 2 x 5AR4. 2 x 0D3
  • Gain factory set at 18 dB at max Volume
  • Internal variable feedback 8 to 12dB ADJUSTABLE
  • Noise floor: typically -70 dB (1 Hz - 100 KHz)
  • S/N ratio: typically 105 dB (A WCT, 20 Hz - 20 KHz)
  • Frequency Response +- 1 dB: 5 Hz to 50 KHz
  • Distortion THD+N: -80 dB (.01 %) zero "crossover" distortion, mostly 2nd harmonic
  • Input Impedance: 100 Kohm: Precision stepped attenuator
  • Output Impedance (LINE STAGE): 100 ohms
  • Output Power (100 ohm Headphones): 1W (10 V RMS) (28 V P-P)
  • Output Power (600 ohm Headphones): 1W( 25 V RMS) (70 V P-P)
  • Power Consumption: 170 Watts (1.4 A @ 120VAC)
  • Dimensions: W=19". L=13". H=3 1/2"
  • Shipping weight: 28 Ibs.

 



PDF Files
{Download Owners Manual}

 

  
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