{"product_id":"useful-arts-sfp-60-dual-tube-microphone-preamp","title":"Useful Arts SFP-60 Dual Channel Tube Microphone Preamp","description":"\u003ch2 style=\"text-align: center;\"\u003eUseful Arts SFP-60 Dual Channel Tube Microphone Preamp\u003c\/h2\u003e\n\u003c!-- Video Section with Keyword Title --\u003e\n\u003cdiv style=\"margin: 20px auto 10px auto; text-align: center; max-width: 800px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin-bottom: 12px;\"\u003eUseful Arts SFP-60 Tube Preamp Demo\u003c\/h2\u003e\n\u003ciframe style=\"width: 100%; max-width: 800px; height: 450px; display: block; margin: 0 auto; border-radius: 8px;\" src=\"https:\/\/www.youtube.com\/embed\/lgjeA7T1fsA?si=UKSnZhX7Mgcbo2wz\"\u003e\n  \u003c\/iframe\u003e\n\u003c\/div\u003e\n\u003c!-- Section 1 --\u003e\n\u003cdiv class=\"par-section\"\u003e\n\u003cdiv class=\"par-image\"\u003e\u003cimg alt=\"Useful Arts SFP-60 dual channel tube microphone preamp\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Useful_arts_sfp_top_view.png?v=1770159636\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"par-text\"\u003e\n\u003ch2\u003eClear, Present, and Forward Vocal Character\u003c\/h2\u003e\n\u003cp\u003eThe sound of the Useful Arts SFP-60 is more clear, present, and edgy than dark and creamy, specifically designed to make vocals sound forward and intimate. This is accomplished by using tubes for what they are best at — accentuating harmonics that make sound more clear and pleasing to the ear in the real world.\u003c\/p\u003e\n\u003cp\u003eEach channel features an EF-806 pentode input tube that adds third-order harmonic content contributing to the clarity and bite associated with great early radio recordings. The final two gain stages use high-current ECC82 triodes that contribute second-order harmonic components, adding richness and thickness to the sound without sounding dark. The pedestrian 12AX7 — wonderful in guitar amps but common in mass-market tube preamps — is nowhere to be found in the SFP-60.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Section 2 --\u003e\n\u003cdiv class=\"par-section reverse\"\u003e\n\u003cdiv class=\"par-image\"\u003e\u003cimg alt=\"Useful Arts SFP-60 Color control variable harmonic distortion\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Useful_arts_sfp_60_front_view.png?v=1770159635\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"par-text\"\u003e\n\u003ch2\u003eVariable Color Control for Artistic Distortion\u003c\/h2\u003e\n\u003cp\u003eUnlike most preamps designed to maintain a predetermined ratio of distortion to gain, the SFP-60 puts the artistic choice of distortion directly in your hands. At a Color setting of zero, the preamp is very clean and sounds polite. At a setting of ten, it adds about 10 dB of gain and increases distortion artifacts by nearly ten times, resulting in an aggressive, full sound that stands out in a mix and grabs the listener's attention.\u003c\/p\u003e\n\u003cp\u003eThe character of harmonic distortion in the SFP-60 has a spectral effect that feels EQ-related but is completely different from equalization. While EQ filters give you more or less of what you put in (along with undesirable phase shifts), the preamp is actually adding signal that isn't present in the original — and every audio device ever made introduces distortion, so Useful Arts made it a good thing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Section 3 --\u003e\n\u003cdiv class=\"par-section\"\u003e\n\u003cdiv class=\"par-image\"\u003e\u003cimg alt=\"Useful Arts SFP-60 transformer balanced inputs outputs\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/USEFUL_ARTS_SPF-30_REAR_1.png?v=1770161444\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"par-text\"\u003e\n\u003ch2\u003eOver 60dB of Usable Gain With Maximum Headroom\u003c\/h2\u003e\n\u003cp\u003eThe input and output levels of the triode stages in the SFP-60 are separately controllable by detented attenuators, and combined with the Color control, the SFP-60 provides just over 60 dB of usable gain. The high-voltage soft-start power supply delivers over 270 volts of clean, regulated power to ensure maximum headroom and the lowest noise floor possible.\u003c\/p\u003e\n\u003cp\u003eFrequency response is flat within 2 dB from 20 Hz to 20 kHz. Each channel features transformer-balanced inputs and outputs using gold-plated XLR connectors, along with an op-amp buffered VU meter that ensures the signal is not loaded by the metering circuit. The audio power supply features a toroidal dual-primary transformer and linear regulation for lowest noise.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eHighlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTwo-channel Class A tube preamp with single-ended design\u003c\/li\u003e\n\u003cli\u003eEF-806 pentode input stages and dual ECC82 triode gain stages per channel\u003c\/li\u003e\n\u003cli\u003eVariable Color control for adjustable harmonic distortion (polite to aggressive)\u003c\/li\u003e\n\u003cli\u003eOver 60 dB of usable gain with maximum headroom\u003c\/li\u003e\n\u003cli\u003eHigh-voltage soft-start power supply delivering over 270 volts\u003c\/li\u003e\n\u003cli\u003eTransformer-balanced inputs and outputs with gold-plated XLR connectors\u003c\/li\u003e\n\u003cli\u003eSealed gold-plated relays for all switching functions (no signal passes through switches)\u003c\/li\u003e\n\u003cli\u003eDual front-panel instrument inputs and rear-panel XLR mic inputs\u003c\/li\u003e\n\u003cli\u003eSwitchable phantom power, pad, phase reverse, and high-pass filter per channel\u003c\/li\u003e\n\u003cli\u003eVU meters per channel (op-amp buffered)\u003c\/li\u003e\n\u003cli\u003eAircraft-grade aluminum faceplate with laser-engraved markings\u003c\/li\u003e\n\u003cli\u003e2U rackmount design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUseful Arts SFP-60 Specifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #ccc;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"text-align: left; padding: 10px; border: 1px solid #ccc; width: 35%;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 10px; border: 1px solid #ccc;\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003ePreamp Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eAll-tube, single-ended Class A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eNumber of Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eTubes (Per Channel)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e1 x JJ EF-806 pentode, 1 x JJ ECC82 triode\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e20 Hz – 20 kHz, ±2 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eUsable Gain\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eOver 60 dB (including Color knob engagement)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eSeparate regulated DC supplies for filaments, phantom, and high voltage (270V+); toroidal dual-primary transformer with linear regulation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003ePhantom Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e+48V switchable per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eInput Pad\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e-22 dB switchable per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eHigh-Pass Filter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eSwitchable per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003ePhase Reverse\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eSwitchable polarity reverse per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eColor Control\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eVariable harmonic distortion per channel (0-10)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eAnalog Inputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e2 x rear-panel XLR (mic), 2 x front-panel 1\/4\" (instrument)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eAnalog Outputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e2 x XLR (transformer-balanced line outputs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eMetering\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eDual VU meters (op-amp buffered)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003ePower Source\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eStandard IEC AC cable (115\/230V selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eRack Spaces\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e2U\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e0.190\" aircraft-grade aluminum faceplate (dark green anodized), fully modular design, gold-plated connectors, laser-engraved markings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #ccc;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"text-align: left; padding: 10px; border: 1px solid #ccc;\"\u003eIncluded Items\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eUseful Arts SFP-60 Dual Channel Tube Microphone Preamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003ePower Cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eUser Documentation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Useful Arts","offers":[{"title":"Default Title","offer_id":47944209957019,"sku":"SFP-60","price":2999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Useful_arts_sfp_60_front_view.png?v=1770159635","url":"https:\/\/proaudioreserve.com\/products\/useful-arts-sfp-60-dual-tube-microphone-preamp","provider":"Pro Audio Reserve","version":"1.0","type":"link"}