Neo-Classic 300B Preamplifier RC

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.

• 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 6SL7 Sovtek

• Rectifier Tubes: 2 x 5AR4 Ruby

• Regulator Tubes: 2 x OD3

• 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

• Mains 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.