A single Manley 300B Preamplifier provides truly appropriate power and voltage swing for headphones and makes a remarkable line driver. Here is where the impedances are not too low and the power requirements are not too high: ideal for this kind of tube in a single-ended configuration. This was the genesis of a new preamp.

• Inputs: 5 stereo pair unbalanced RCA jacks
• Outputs: 2 stereo pairs MAIN out same as SUB out unbalanced RCA jacks
• RECORD output: 1 stereo pair pre-volume control unbalanced RCA jacks
• HEADPHONE Outs: 2 front panel 1/4" headphone jacks
• Optimized headphone impedance switching: 30-400 ohms to 300-4000 ohms
• MUTE: Selecting HEADPHONE operation mutes LlNE outputs
• Output Vacuum Tubes: 2 x 300B Electro-Harmonix
• Input Tubes: 2 x 6SL7GT Electro-Harmonix
• Rectifier Tubes: 2 x 5U4GBEH Electro-Harmonix or 5AR4 China (Do NOT use the Sovtek 5AR4!)
• Regulator Tubes: 2 x OD3 NOS JAN USA
• Gain: factory set at 12 dB at max Volume
• Internal Variable Feedback: 8.5 dB of global NFB is used @ 12 dB of gain, adjustable trim -1.7dB to +1dB
• Noise Floor: typically -70 dB (1 Hz - 100 KHz)
• S/N Ratio: typically 105 dB (A WGT, 20 Hz - 20 KHz)
• Frequency Response: 5 Hz to 50 KHz 1dB
• Channel-to-Channel Separation (L to R): @1KHz 48 dB; @10KHz 35 dB; @20KHz 34 dB
• Channel-to-Channel Separation (R to L): @1KHz 50 dB; @10KHz 40 dB; @20KHz 37 dB
• THD: 0.08 % @ 1KHz at 1V rms out
• Distortion THD+N: -80 dB (.01 %) zero "crossover" distortion, mostly 2nd harmonic
• Input Sensitivity: 250mV (-9.8dBu) yields 1V out
• Input Impedance: 100 Kohm Noble volume control
• Maximum Input Level: 5.5dBu or 1.459 Vrms @ 1KHz, volume control at maximum
• Output Impedance (LINE STAGE): 100 ohms
• Maximum Output Level: 17.2dBu or 5.636 Vrms @ 1KHz, volume control at maximum
• 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)
• Operating Mains Voltage: Factory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage.
• Operating Mains Voltage: changeable with power transformer re-wiring and fuse value change.
• Mains Voltage Frequency: 50~ 60Hz
• Dimensions: W=19". L=13". H=3 1/2"

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