Manley Labs Neo-Classic 300B Preamplifier RC
5 stereo inputs preamplifier with all-triode input stage running in pure Class A
We combine the historic 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, we implemented vacuum tube rectification and regulation in the power supply along with plenty of capacity. We also developed an additional (and innovative) ripple rejection circuit to filter out power supply noise making this an incredibly low-noise preamplifier- especially critical for headphone users.
Complementing this lovely and rich sounding line-driver is the ALPS audiophile volume control, gold plated RCA connectors, high purity silver wire, mil-spec printed circuit boards with extra thick copper and plating, and custom designed output transformers which we wind right here in our own magnetics department. It all adds up...
For 2002, we returned to our classic and elegant "Manley-Blue" pewter grey color and the chassis was reworked to accommodate a few updates we had in mind " and in 2022, we added Black and Silver faceplates as custom-order options.
Whether you use headphones or loudspeakers this preamp will deliver the goods and spoil you for any other preamplifier.
Specifications
Inputs: 5 stereo pair unbalanced RCA jacksOutputs: 2 stereo pairs MAIN out same as SUB out unbalanced RCA jacksRECORD output: 1 stereo pair pre-volume control unbalanced RCA jacksHEADPHONE Outs: 2 front panel 1/4" headphone jacksOptimized headphone impedance switching: 30-400 Ohms to 300-4000 OhmsMUTE: Selecting HEADPHONE operation mutes LlNE outputsOutput Vacuum Tubes: 2 x 300B Electro-HarmonixInput Tubes: 2 x 6SL7 SovtekRectifier Tubes: 2 x 5AR4 RubyRegulator Tubes: 2 x OD3Gain: factory set at 12 dB at max VolumeInternal Variable Feedback: 8.5 dB of global NFB is used @ 12 dB of gain, adjustable trim -1.7dB to +1dBNoise 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 1dBChannel-to-Channel Separation (L to R): @1KHz 48 dB; @10KHz 35 dB; @20KHz 34 dBChannel-to-Channel Separation (R to L): @1KHz 50 dB; @10KHz 40 dB; @20KHz 37 dBTHD: 0.08 % @ 1KHz at 1V rms outDistortion THD+N: -80 dB (.01 %) zero "crossover" distortion, mostly 2nd harmonicInput Sensitivity: 250mV (-9.8dBu) yields 1V outInput Impedance: 100 kOhm Noble volume controlMaximum Input Level: 5.5dBu or 1.459 Vrms @ 1KHz, volume control at maximumOutput Impedance (LINE STAGE): 100 OhmsMaximum Output Level: 17.2dBu or 5.636 Vrms @ 1KHz, volume control at maximumOutput 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~ 60HzMains Fuse Value: 3A SLO-BLO (100, 120VAC operation), 1.5A SLO-BLO (220-240VAC operation)Dimensions: W=19" x L=13"Top Deck Height: 4"Transformer Height: 3 1/2"Suggested shelf height minimum: 10" (depending on height of 300B tube)Shipping Weight: 28 Ibs.
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