Useful Arts SFP-60 Tube Preamp

Useful Arts

(No reviews yet) Write a Review
Product Code: 2643
$2,999.00
Adding to cart… The item has been added
Built To Order

This item is built to order and may have a lead-time before shipping, but we will get it to you as quickly as possible. Go ahead and place your order and we will follow up with an ETA as soon as we have it. If you have a deadline then please contact us before placing the order so we can meet your expectations.

Got Questions? Need Support?

888-228-4530 Contact Us!

The Useful Arts SFP-60 Tube Preamp is an all tube two channel mic prel, full-featured and designed to make microphone signals stand out in a mix - without the need for additional processing.

The Useful Arts SFP-60 Tube Preamp has a clear, present and edgy sound, and is specifically designed to make vocals sound forward and intimate. We accomplish this by using tubes for what they are best at – accentuating harmonics that make sound more clear and pleasing to the ear and brain in the real world. Different tubes have different properties. Properly used, pentodes add third-order harmonic content that contributes the the “clarity” and “bite” associated with the sounds of the great early radio recordings. Triodes contribute more second-order harmonic components, which add a richness, or “thickness” to the sound without sounding dark. (Note: These are subjective impressions. People can and do debate these adjectives for a lifetime). The SFP-60 input tube is an EF-806 pentode, and the final 2 gain stages are high-current ECC82 triodes. 12AX7s, which are wonderful in guitar amps and form the basis of many mass-marketed tube mic preamp circuits, are nowhere to be found in the SFP-60.

Useful Arts SFP-60 Tube Preamp Features

  • Absolutely no signal passes through these switches, because we hate the noise that develops over time in even the most expensive switches. Instead, the 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-60 are separately controllable by detented attenuators, and combined with the color control, the SFP-60 provides just over 55dB of useable gain.
  • The rear panel is simple: Gold-plated XLR connectors for the transformer-balanced inputs and outputs, a ground post, and a voltage selector for 115/230 volt operation.
  • The faceplate is milled from .190”-thick aircraft-grade aluminum for maximum rigidity, and anodized in a very dark green finish. All markings on the front panel are laser-engraved, ensuring that the unit’s appearance will not deteriorate with age.
  • The only active devices in the signal path are the three tube gain stages, consisting of 1 EF806 and 1 ECC82 per channel. We use 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.
  • Construction is fully modular, with gold plated connectors used throughout the audio path.

Useful Arts SFP-60 Tube Preamp Specifications

  • 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 2dB from 20Hz-30KHz:
  • Each channel of the SFP-60 features 5 switches:
  • Input selector (Rear XLR/Front Instrument Input)
    • High Pass Filter
    • Input Pad
    • Phase Reverse
    • Phantom Power

Useful Arts SFP-60 Tube Preamp Includes

  • SFP-60 Tube Preamp
  • Power Cable
  • Manual
  • Warranty Information

No review yet, Be first to Write a Review