{"product_id":"neo-classic-300b-rc-preamplifier","title":"NEO-Classic 300B RC Preamplifier","description":"\u003cp\u003eWe 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.\u003c\/p\u003e\n\u003cp\u003eComplementing 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...\u003c\/p\u003e\n\u003cp\u003eFor 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.\u003c\/p\u003e\n\u003cp\u003eWhether you use headphones or loudspeakers this preamp will deliver the goods and spoil you for any other preamplifier.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eInputs: 5 stereo pair unbalanced RCA jacks\u003c\/p\u003e\n\u003cp\u003eOutputs: 2 stereo pairs MAIN out same as SUB out unbalanced RCA jacks\u003c\/p\u003e\n\u003cp\u003eRECORD output: 1 stereo pair pre-volume control unbalanced RCA jacks\u003c\/p\u003e\n\u003cp\u003eHEADPHONE Outs: 2 front panel 1\/4\" headphone jacks\u003c\/p\u003e\n\u003cp\u003eOptimized headphone impedance switching: 30-400 Ohms to 300-4000 Ohms\u003c\/p\u003e\n\u003cp\u003eMUTE: Selecting HEADPHONE operation mutes LlNE outputs\u003c\/p\u003e\n\u003cp\u003eOutput Vacuum Tubes: 2 x 300B Electro-Harmonix\u003c\/p\u003e\n\u003cp\u003eInput Tubes: 2 x 6SL7 Sovtek\u003c\/p\u003e\n\u003cp\u003eRectifier Tubes: 2 x 5AR4 Ruby\u003c\/p\u003e\n\u003cp\u003eRegulator Tubes: 2 x OD3\u003c\/p\u003e\n\u003cp\u003eGain: factory set at 12 dB at max Volume\u003c\/p\u003e\n\u003cp\u003eInternal Variable Feedback: 8.5 dB of global NFB is used @ 12 dB of gain, adjustable trim -1.7dB to +1dB\u003c\/p\u003e\n\u003cp\u003eNoise Floor: typically -70 dB (1 Hz - 100 KHz)\u003c\/p\u003e\n\u003cp\u003eS\/N Ratio: typically 105 dB (A WGT, 20 Hz - 20 KHz)\u003c\/p\u003e\n\u003cp\u003eFrequency Response: 5 Hz to 50 KHz 1dB\u003c\/p\u003e\n\u003cp\u003eChannel-to-Channel Separation (L to R): @1KHz 48 dB; @10KHz 35 dB; @20KHz 34 dB\u003c\/p\u003e\n\u003cp\u003eChannel-to-Channel Separation (R to L): @1KHz 50 dB; @10KHz 40 dB; @20KHz 37 dB\u003c\/p\u003e\n\u003cp\u003eTHD: 0.08 % @ 1KHz at 1V rms out\u003c\/p\u003e\n\u003cp\u003eDistortion THD+N: -80 dB (.01 %) zero \"crossover\" distortion, mostly 2nd harmonic\u003c\/p\u003e\n\u003cp\u003eInput Sensitivity: 250mV (-9.8dBu) yields 1V out\u003c\/p\u003e\n\u003cp\u003eInput Impedance: 100 kOhm Noble volume control\u003c\/p\u003e\n\u003cp\u003eMaximum Input Level: 5.5dBu or 1.459 Vrms @ 1KHz, volume control at maximum\u003c\/p\u003e\n\u003cp\u003eOutput Impedance (LINE STAGE): 100 Ohms\u003c\/p\u003e\n\u003cp\u003eMaximum Output Level: 17.2dBu or 5.636 Vrms @ 1KHz, volume control at maximum\u003c\/p\u003e\n\u003cp\u003eOutput Power (100 Ohm Headphones): 1W (10 V RMS) (28 V P-P)\u003c\/p\u003e\n\u003cp\u003eOutput Power (600 Ohm Headphones): 1W( 25 V RMS) (70 V P-P)\u003c\/p\u003e\n\u003cp\u003ePower Consumption: 170 Watts (1.4 A @ 120VAC)\u003c\/p\u003e\n\u003cp\u003eOperating Mains Voltage: Factory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage.\u003c\/p\u003e\n\u003cp\u003eOperating Mains Voltage: changeable with power transformer re-wiring and fuse value change.\u003c\/p\u003e\n\u003cp\u003eMains Voltage Frequency: 50~ 60Hz\u003c\/p\u003e\n\u003cp\u003eMains Fuse Value: 3A SLO-BLO (100, 120VAC operation), 1.5A SLO-BLO (220-240VAC operation)\u003c\/p\u003e\n\u003cp\u003eDimensions: W=19\" x L=13\"\u003c\/p\u003e\n\u003cp\u003eTop Deck Height: 4\"\u003c\/p\u003e\n\u003cp\u003eTransformer Height: 3 1\/2\"\u003c\/p\u003e\n\u003cp\u003eSuggested shelf height minimum: 10\" (depending on height of 300B tube)\u003c\/p\u003e\n\u003cp\u003eShipping Weight: 28 Ibs.\u003c\/p\u003e","brand":"Manley","offers":[{"title":"Blue","offer_id":62808954077343,"sku":null,"price":11500.0,"currency_code":"CAD","in_stock":true},{"title":"Black","offer_id":62808954110111,"sku":null,"price":11500.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/5532\/6111\/files\/21629_full_a71a2a69-643e-4c85-83ff-bc79beaf9cd7.jpg?v=1780694264","url":"https:\/\/altitudoaudio.ca\/products\/neo-classic-300b-rc-preamplifier","provider":"Altitudo Audio","version":"1.0","type":"link"}