SKU: 9181740223

Ypsilon PST100 Mk2 Stereo Preamplifier

Sale price$26100.00 Regular price$29000.00
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Description

Ypsilon PST100 Mk2 Stereo PreamplifierYpsilon PST 100 Mk2 TA Stereo Transformer Attenuator Preamplifier The PST100 approaches the concept of pre amplification in an outstanding way. At its heart are the in house made transformers used for attenuation. In addition, its valve state circuit combined with exquisite materials produce the finest and most elegant sound that any pre amplifier could ever achieve. Conventional wisdom suggests that the most critical part of a pre amplifier is the

Ypsilon PST-100 Mk2 TA

Stereo Transformer Attenuator Preamplifier

The PST–100 approaches the concept of pre-amplification in an outstanding way. At its heart are the in-house made transformers used for attenuation. In addition, its valve state circuit combined with exquisite materials produce the finest and most elegant sound that any pre-amplifier could ever achieve.

Conventional wisdom suggests that the most critical part of a pre-amplifier is the active circuit design. However, Ypsilon believe that the means of signal attenuation (the volume control) is the most critical to the overall sound of a preamplifier. Most designers use resistor attenuators for volume control. Ypsilon have used resistor attenuators with high quality resistors (eg. Vishay) in the past but felt unsatisfied with the character they induced in the signal. Ypsilon developed a very special transformer as the means of attenuation, using special winding techniques and highest quality wires and cores. Its performance surpassed that of the best resistor attenuators. In a transformer the magnetic circuit can be ultra linear when the very best core materials are used. The sound of such materials is much more musical and detailed compared with the best resistors. A transformer attenuator with 31 taps is used in the PST100 mk2 providing a total attenuation of 54db in its lowest tap.

The active gain stage is a no feedback S.E. C3M triode, transformer coupled. The power supply uses valve rectification (using the 6CA4) and choke filter. Wiring is point to point with custom made pure silver wire. The transformer attenuator is placed after the valve stage, preserving the purity and micro details of the signal. The gain is 16db. Output impedance is 150 Ω max.

PST 100 Mk2 TA is also available without the valve stage for systems that don’t require additional gain. This version is equipped with the transformer attenuators and is called PST 100 TA. Please note that it is fully upgradeable to the full version at any time by returning to factory.

The PST 100 mk2 represents the pinnacle in preamplification and is an essential component if you are building a ‘no-holds-barred’ system.

Awards

Reviews

Stereophile, Michael Fremer, 2014

For now, the Ypsilon PST-100 Mk.II is the most transparent and, therefore, the most perfect audio component I have ever heard—or not heard.

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Positive Feedback, Marshall Nack, 2014

Here’s the scoop: For those who are looking for a little bit of creature friendliness served up along with excellent grades on the audio scorecard, you’d be hard pressed to find better than the PST 100 Mk II at any price.

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Dagogo, Ed Momkus, 2009

there is no disputing the fact that this is a preamp that stands at the pinnacle of sonic splendor.

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Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
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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]
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SKU: 9181740223

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jewelrycook
Carnegie, US
★★★★★ 5
Bouncy, not hard, and good value.
Style: Fetch Balls (Pack of 10), Size: 2.5 inch
Great balls for the ball launcher and not rockhard like some of the solid rubber balls. These have great bounce, and because of the two holes, they make a fun whistling noise as they fly through the air. My dogs love them and they are a good value. By the way, if you throw them too hard, they will go through chain-link and no climb fence because they squish a bit!
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Reviewed in the United States on February 16, 2026
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IT Secure Force
Houston, US
★★★★★ 5
Excellent dog balls — safe design and very durable
Style: Fetch Balls (Pack of 3), Size: 2.5 inch
These fetch balls from Amazon Basics are fantastic, and my dog absolutely loves them. One of the biggest reasons I prefer these over other brands is the hole that runs through the center of the ball. This is a very important safety feature: if a dog were to accidentally get the ball stuck in the back of the throat, the hole allows air to pass through. That small detail could literally make a life-saving difference. Aside from the safety benefit, they bounce well, are easy to clean, and hold up to a lot of playtime. They’re firm but not rock-hard, and my dog goes crazy for them. Great value, great quality, and a thoughtful design. Highly recommended for dog owners who want a safer alternative to standard solid rubber balls.
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Reviewed in the United States on December 1, 2025
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mike
Carnegie, US
★★★★★ 5
Great ball for heavy chewers
Style: Assorted Balls (Pack of 3), Size: 2.5 inch
Great toy for my Doberman. She chews through tennis balls in about 15 minutes but these are very durable. She likes to chase them but also just chew on them.
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Reviewed in the United States on April 26, 2026
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Me
West Palm Beach, US
★★★★★ 5
Durable
Style: Fetch Balls (Pack of 2), Size: 3 inch
Very bouncy. I like the noise it makes when you throw it. Pretty durable. Good size. Dog loves to play with them. Good material. Easy to use.
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Reviewed in the United States on April 5, 2026
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Susan Cedar
Natrona Heights, US
★★★★★ 4
My dog loves glowing fetch at night!
Style: Glow Balls (Pack of 3), Size: 2.5 inch
Fantastic. Sturdy. My dog loves them Glow in the dark is great for fetch at night. I keep a flashlight with me because the glow doesn't last really long. But they charge very quickly and are really bright.
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Reviewed in the United States on February 22, 2026

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