SKU: 81048113279

Pro-Ject Tube Box S3 B Phono Pre-amplifier

Sale price$465.30 Regular price$517.00
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Description

Pro-Ject Tube Box S3 B Phono Pre-amplifierBalanced audiophile tube phono stage Audiophile tube warmth The Tube Box S3 B is a audiophile phono preamplifier that brings true analog warmth to your vinyl playback. It features a fully symmetrical and discrete gain stage, balanced 5 pin mini XLR input, and balanced XLR outputs. Adjust settings easily from the front panel, and enjoy clean, interference free performance thanks to its robust aluminium chassis. Available in silver or black and made in

Balanced audiophile tube phono stage

Audiophile tube warmth

The Tube Box S3 B is a audiophile phono preamplifier that brings true analog warmth to your vinyl playback. It features a fully symmetrical and discrete gain stage, balanced 5-pin mini XLR input, and balanced XLR outputs. Adjust settings easily from the front panel, and enjoy clean, interference-free performance thanks to its robust aluminium chassis. Available in silver or black and made in Europe, the Tube Box S3 B is a compact yet powerful upgrade for any serious vinyl setup.

"B" stands for balanced

The symmetrical design is the real standout feature! Connect your turntable with the 5-pin mini XLR cable & profit of the balanced signal path. Symmetrical, or also called balanced, transmissions consist of a hot and a cold (also called + and -) signal. Both signal chains effectively carry the same musical information. A true balanced gain stage can now extract the final musical information out of the +/- signals and subtract, remove, all noise that could potentially be added along the transmission. As there are two separate signal chains, we also needed two individual amplifier sections. Definitely unseen in this price range & the best and cleanest amplifier for your phono signal!

Features

  • 5-pin mini XLR balanced input
  • Balanced XLR outputs
  • Fully symmetrical & discrete gain stage
  • Easy settings adjustment on the faceplate
  • 2x ECC83 tubes (replaceable)
  • MM & MC capable
  • Dual mono design
  • Semi-passive RIAA equalisation
  • Superior low noise / low distortion
  • Aluminium casing protects against interference
  • Available in silver or black
  • Made in Europe

Technical Specifications

  • Tube assembly: 2x ECC83 (12AX7)
  • Input impedance: 10, 50, 100, 1k, 47k ohms
  • Input capacitance: 50, 150, 300, 400 pF
  • Gain (+ 6dB using XLR Out sockets): 40, 45, 60, 65 dB
  • Signal / Noise ratio MM (40dB): 97dBV, 105dBV - 'A' weighted
  • Signal / Noise ratio MC (60dB): 83dBV, 88dBV - 'A' weighted
  • THD at 1 kHz: <0,005% MM, < 0,01% MC
  • THD (20Hz-20kHz): <0,1% MM, < 0,03% MC
  • RIAA-equalization curve accuracy: <0,4dB / 20Hz - 20kHz
  • Subsonic filter: at 20Hz with 18dB/octave
  • Input: 1x 5-pin mini XLR / 1x pair RCA phono sockets
  • Line-level output: 1x pair RCA, 1x pair XLR
  • Power supply DC: 18V/1000mA
  • Power consumption: 18V/800mA DC, <0.5 W in standby
  • Dimensions: 206 x 81 x 153 (164 with sockets) mm (W x H x D)
  • Weight: 1010g without power supply
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 81048113279

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Dan C.
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★★★★★ 5
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Color: Green, 4 Pack, Size: Large
Fantastic socks for USAF or other military uniform. I'm in uniform all day and these socks keep my feet from smelling and keeps them comfortable all day! Great quality as well!
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Reviewed in the United States on May 15, 2026
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e185
Dallas, US
★★★★★ 5
Nice Quality Socks
Color: Coyote Brown, 3 Pack, Size: Large, Color: Coyote Brown, 3 Pack, Size: Large
Hate shopping for clothes online, even for socks. Looked at lots of different brands and settled on these due to their customer reviews which seemed positive. I ordered 2 of the 3 packs of the coyote brown in the large size. The color is pretty accurate to the advertisement. You can see my picture of the new sock unrolled straight out of the box alongside a tape measure that shows the length. The socks seem like they are very good quality. The aren't thin or see through like some of the cheaper options I considered. To me the are similar in thickness to a name brand white tube sock like Hanes or Fruit of the Loom. The large size is 18 1/2 inches long in it's natural shape and easily stretches over the calf but below the knee. I wanted to lighten the color to more closely match my work pants and tried washing them 5 times with bleach mixed in the washer. They held their color, and elasticity even with the bleach, so I didn't get the color change I was hoping for but goes to show that under normal washing (without bleach) the color won't likely fade anytime soon. The have great stretch and elasticity and stay up above the calf all day without sliding down. Definitely ordering these again when needed.
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Reviewed in the United States on January 24, 2026
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Geraldine
Houston, US
★★★★★ 5
Good cushion and comfort for long term wear
Color: Green, 4 Pack, Size: Small
Great quality, very soft and cushioned.
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Reviewed in the United States on May 16, 2026
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Kalee B.
Carnegie, US
★★★★★ 4
Good replacement for GI socks
Color: Green, 4 Pack, Size: Medium
I ordered these for my son, he’s in the military and the socks they issued him were all getting holes worn in the top of the toe area from his work boots. So I ordered him some of these to supplement his normal ones. He said they’re pretty comfortable, we’ll see how they hold up after he wears them for awhile. But initially I’d say they’re a good buy. Points for the affordability.
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Reviewed in the United States on February 23, 2026
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Derek Boyce
Carnegie, US
★★★★★ 5
Better than described
Color: Green, 4 Pack, Size: Large
Very comfortable socks that stay up in my boots. Look forward to purchasing more!
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Reviewed in the United States on May 30, 2026

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