Useful Arts SFP-30 Single Channel Tube Microphone Preamp

The concept behind the Useful Arts SFP-30 Single Channel Tube Microphone Preamp is simple: Take the exact audio and power circuitry from the SFP-60, put a single channel into a tabletop format, and make it less than half the price of the SFP-60. Done. Everything about the SFP-30 signal path is identical to the SFP-60, except that the SFP-30 lacks the DI input. Other than that, you can now get the finest, most flexible tube preamp available. A better sonic toolkit for recording simply isn't available at this price. Anywhere.

Features:

• High voltage soft start power supply puts out over 270 volts of clean, regulated power to ensure maximum headroom and the lowest noise possible
• Each gain stage is single-ended, inherently Class A
• Audio Magnetics (Input and Output Transformers, Plate Inductor) custom wound by Cinemag
• Output Transformer with 50% nickel core
• Frequency response is flat within 2 dB from 20 Hz-30 kHz
• Each channel of the SFP-30 features 4 switches: High Pass Filter, Input Pad, Phase Reverse, and Phantom Power
• Front panel switches control sealed, gold-plated relays to ensure years of operation without pops and clicks
• The input and output levels of the triode stages of the SFP-30 are separately controllable by detented attenuators, and combined with the color control, the SFP-30 provides just over 55 dB of useable gain
• Voltage selector for 115/230 volt operation in the IEC fuse block on black panel, gold-plated XLR connectors are on the front panel
• The only active devices in the signal path are the three tube gain stages, consisting of 1 EF806 and 1 ECC82 per channel
• New-manufacture JJ tubes for long life and easy replacement
• Each channel features an output level VU meter, which is op-amp buffered to ensure that the signal is not loaded by the meter
• The audio power supply features a toroidal dual-primary transformer and linear regulation for lowest noise