904L 9.52*1.24mm Stainless steel coiled tubing chemical component ,Gramophone Dreams #70: Sutherland Engineering SUTZ & Lounge Audio Copla preamp, Dynavector DV-20X2 and XX-2 MKII cartridge

But as I write this monthly column, I’m aiming for a different feel, more like driving a ’70s Ford station wagon off-road and documenting motels and gas stations. The tour was fun, easy, with great views and stops at every car museum, snake farm and stalactite cave.

Specification

904L 9.52*1.24mm Stainless steel coiled tubing suppliers

alloy 904L tubing (UNS N08904) for use in applications that require moderate to high corrosion resistance. Alloy 904L is a low carbon high alloy austenitic stainless steel, originally developed to resist corrosion in dilute sulfuric acid. Because of the combination of chromium, nickel, molybdenum and copper, this grade has greatly improved resistance to strong reducing acids, particularly sulfuric acid. Alloy 904L tubing is also extremely resistant to chloride attack from both pitting/crevice corrosion and stress corrosion cracking. Alloy 904L is non-magnetic in all conditions, possesses amazing toughness, and has good formability and weldability.

Because of these properties, one can find alloy 904L tube in many applications. These range from utility scrubber assemblies to acid and fertilizer production equipment, pulp and paper processing, seawater cooling facilities. Used in processes containing sulfuric or phosphoric acids, 904L displays its excellent resistance to corrosion from those acids. The paper, gas, pharmaceutical and chemical industries also use 904L for its resistance and use to 400-450 degrees C. Alloy 904L tubing can be welded, machined, heat treated, annealed, hardened and cold worked for many purposes.

UNS NO8904, commonly known as 904L, is a low carbon high alloy austenitic stainless steel which is widely used in applications where the corrosion properties of AISI 316L and AISI 317L are not adequate.

The addition of copper to this grade gives it corrosion resistant properties superior to the conventional chrome nickel stainless steels, in particular to sulphuric, phosphoric and acetic acids. However, there is limited use with hydrochloric acids. It also has a high resistance to pitting in chloride solutions, a high resistance to both crevice and stress corrosion cracking. Alloy 904L performs better than other austenitic stainless steels due to the higher alloying of nickel and molybdenum.

The grade is non-magnetic in all conditions and has excellent formability and weldability. The austenitic structure also gives this grade excellent toughness, even down to cryogenic temperatures.

The high chromium content promotes and maintains a passive film which protects the material in many corrosive environments.904L has a greater resistance to precipitation of ferrite and sigma phases on cooling and welding than other stainless steels containing molybdenum such as 316L and 317L. There is no risk of intercrystalline corrosion on cooling or welding due to the low carbon content. Its maximum service temperature is at 450°C.

This grade is particularly useful in control and instrumentation tubing applications where 316 and 317L are not suitable.

904L stainless steel combines molybdenum and copper with iron for tremendously increased resistance to reducing acids like sulphuric acid. It stands up extremely well to chlorides in the environment for low pitting and crevice corrosion, as well as stress corrosion cracking.

904L Stainless Steel Pipes and Tubes Product Range  904L Stainless Steel Pipes and Tubes Specifications: ASTM A/ASME SA 269/677 904L Stainless Steel Pipes and Tubes Sizes (Seamless): 1/2″ NB – 8″ NB 904L Stainless Steel Pipes and Tubes Sizes (ERW): 1/2″ NB – 24″ NB 904L Stainless Steel Pipes and Tubes Sizes (EFW): 6″ NB – 100″ NB

»904L Stainless Steel Pipes and Tubes Dimensions:  All Pipes is manufactured and inspected/tested to the relevant standards including ASTM, ASME and API etc. Key Properties These properties are specified for flat rolled product (plate, sheet and coil) in ASTM B625. Similar but not necessarily identical properties are specified for other products such as pipe, tube and bar in their respective specifications.

Applications

904L stainless steel is widely used in the chemical, pharmaceutical, oil and gas industries. Typical applications include tanks, valves, heat exchangers, flanges and manifolds. The addition of copper to the composition of 904L stainless steel aids its suitability for components such as tanks and other products used in handling sulphuric and phosphoric acid.

This month, I’ll be driving a few miles down the Ford odometer examining the impact of Ron Sutherland’s latest current-driven product: a $3,800 transimpedance dynamic preamplifier called SUTZ. Along the way, I’ll also go back to the $1250 Dynavector DV-20X2 dynamic cartridge and explore what could be the best in the Dynavector cartridge line: the $2150 XX-2 MKII.
Finally, I’ll take a break, get out of the car, and reacquaint myself with Lounge Audio’s $355 Copla preamp, which I’ve been using enthusiastically since reviewing in February 2018, but haven’t written about since reviewing.
Sutherland Engineering SUTZ I spent a lot of time trying to imagine all the electromagnetic noise caused by the swinging of a stick connected to some kind of coil in a magnetic field. I imagined the record’s bumpy groove dangling from a tiny needle/cantilever/coil assembly, stretching the tension wire and rocking the coil through fixed lines of force created by a very small horseshoe magnet. As the coils pass through the magnetic flux of a magnet, a current is induced along their length.
I learned to draw part of Faraday’s law in elementary school. In high school, a teacher explained Lenz’s law, which was even harder to understand: “The polarity of a voltage caused by a change in magnetic flux creates a current whose magnetic field is opposite to the change that caused it.”
Surprisingly, Lenz’s law and its magnetic repulsion came to my mind when I was trying to imagine how current controlled sound stages would work and why they would affect the sound of a cassette in this way. This recollection led me to suggest that loading a moving coil cartridge with a virtual short circuit (no input voltage) maximizes the current flowing through the cartridge coil, which in turn maximizes Lenz’s law reverse thrust, thereby damping to achieve the maximum possible movement of the cantilever coil (footnote 1).
I then tried to imagine how this current damping would compare to the damping provided by a traditional shunt resistor in front of the active stage. I’ve always thought that all differences in load/damping affect how well the stylus tracks the grooves of a record, and I’ve come to the conclusion that differences in damping (whatever they may be) are responsible for differences in tracking, groove noise, visceral feel Causal details and intermodulation distortion.
So far, I’ve covered a bunch of parallel-loaded phono stages, various step-up transformers, and three “transimpedance” phono stages: Lounge Audio’s Copla for $355, Dynavector’s P75 MK3 phono stage for $895, and Sutherland Engineering’s Little Loco for $3,800.
Historically, my taste in phonograph playback has favored high-nickel step-up transformers that try to outshine the atmosphere and filaments of RIAA tube EQs. Lately, though, I’ve been basking in the low-level, high-density information from the Sutherland Engineering Little Loco current-controlled phono stages I’ve been using with My Sonic Lab’s low-output (0.3mV), low-impedance (0 .6 ohm) Ultra Eminent EX dynamic cartridge. Little Loco seems to enhance every little detail this cartridge gives it. Compared to the sound of the Eminent EX on stage on a Parasound Halo JC 3+ phono stage, the My Sonic-Loco combo was played larger (in terms of image and sound space) and sleeker (in terms of texture and scale) – with an abyss behind. These are silent notes.
So suddenly I’m stuck: how do I get all the short-circuit silence and grain-free microdata without being forced to abandon CinemaScope and RIAA’s tube stage technology?
I explained this dilemma to my friend Chad Stelly, who brought the problem to our mutual friend Ron Sutherland of Sutherland Engineering (footnote 2); Ron immediately replied, “I solved it!” A week later, I joined. Ron’s latest invention, the “SUTZ” transimpedance preamplifier, to the 47 kΩ moving magnet input of my Tavish Design Adagio all-tube phono stage.
The SUTZ preamp from Sutherland Engineering uses the same 17 x 2 x 13″ chassis as the Little Loco preamp I described in my January 2022 stereophile. In fact, SUTZ looks exactly like Little Loco inside and out. the same three jumper-activated gain settings as Little Loco. When I asked what gain the SUTZ had, Ron emailed me that all future SUTZs would have five gain settings, but simply scolded me. A transimpedance amplifier has no “gain” because the input units (amperes) do not match the output units (volts). “(footnote 3)
Before I get started, I should mention that the group of components I’m using is what I call an all-tube “real-fi” system: a phono cartridge and step-up transformer connected to a 10.5″ Thomas arm. Schick Dr. Feickert Blackbird rotary EQ, Tavish Design Adagio phono stage or SunValley SV EQ1616D phono stage, Lab 12 Pre 1 line level preamp connected to Elekit TU-8600S SE amplifier (with Western Electric 300B tubes), for Falcon Gold. During these auditions, I was constantly reminded how much I loved this system and how it recorded with more accurate tone and more realistic recordings than any system I’ve built since I started writing for Stereophile.
Dynavector DV-20X2 Since I reviewed it in Gramophone Dreams #10, no cassette in my room has played more discs than the $1,250 Dynavector DV-20X2 dynamic player. I’ve spent hundreds of hours playing it on at least a dozen turntables. It plays the way I love turntable cartridges: crisp, fast, and insightful. He has enough mojo-vivo to make energetic recordings with sharp transients and shots, all while completely relaxed. At this price point, few cartridges can do both. Many people can’t either.
Even with all the time spent, 20X2 still manages to effortlessly produce explosive yet relaxing music, faithfully recreating one of the best and most popular recordings by field engineer David Lewiston: Golden Rain LP “Ketjak: Ramayana Monkey Chant” (LP Nonesuch Explorer ). H72028). The powerful transitions of the 200 monks singing in unison were amazing, even though I knew they were about to burst into cries of ‘tak’. The monks in the courtyard are arranged in concentric circles, which is understandable at a glance. In quiet passages, my mind’s eye likes to pinpoint the location of individual monks singing at the far ends of these circles. When the monks stopped shouting, the ambient sound in the courtyard made me see and feel their presence. Cartridges with this level of insight are rare at this price level.
Every time I played “Monkey Chant” with a Dynavector 20X2 MC, Sutherland SUTZ, and a SunValley SV EQ1616D all-tube phono stage, I was shocked and dazzled by the pristine clarity, lightning speed, and dynamics without hesitation. transients take place with distinct and sharp vocals with noticeable gaps between the singer’s voices. For me, this is a new type of wow! Moment: Current disk information is aesthetically enhanced by SunValley tubes.
Dynavector XX-2 MKII Chad Stelly was thrilled with me in a text about the “incredible synergy” of Dynavector XX-2 MKII dynamics with Sutherland SUTZ, so I contacted Mike at Toffco, Dynavector’s US distributor, Prank (footnote 4), who confirms Chad’s observation that the $2,150 XX-2 MKII is probably the “gold spot” in the Dynavector cartridge line. This is the most exciting time for Dynavector.
I’m still attracted to Dynavector cartridges because of their claim that they focus the engineering program on the core of the problem: magnetic circuit design. Their website explains: “Our calculations and experiments have shown that even very small fluctuations in flux can cause changes in the magnetic force in the air gap, thereby affecting the intermodulation distortion of the output signal.” 5 magnets instead of samarium-cobalt or neodymium-boron. The stated purpose of Dynavector’s patented “flux damping” and “soft magnetic field” is to minimize “unwanted magnetic fluctuations”.
According to the Dynavector website, the XX-2 MKII uses Alnico 5 magnets (footnote 5) as they have a high magnetic flux density which, compared to other types of magnets, “produces a more stable magnetic field and thus maintains a more stable output voltage”. .
The XX-2 MKII has a low (6 ohm) internal resistance and a low output voltage of 0.28 mV. Its motor is housed in a rugged 7075 aluminum housing and the cartridge weighs 9.2 grams. Compliance is specified at 10 µm/mN and Dynavector recommends a low load (30 ohms).
The 20X2 uses an open MicroRidge stylus on a dural tube cantilever, while the XX-2, the cheapest cartridge in the Dynavector line, uses a hard boron cantilever with a Pathfinder stylus with a 7×30 µm line contact on the tip. I If I remember correctly, this is the same Ogura diamond that Lyra and Koetsu used.
Footnote 3: Technically determining the gain of a transimpedance phono stage is not difficult: it is the same as usual, the ratio of output voltage to input voltage or output current to input current – choose one of them. But that’s not the amount of interest for a current-input phono stage, whose job it is to convert current into voltage. For such a device, the step-up transformer analogy is irresistible, which is probably why Ron Sutherland decided to call this product SUTZ: it can be considered a new type of step-up transformer, even if it is not a transformer in the usual sense. Why Z at the end? Probably because the natural way to characterize a transimpedance device is the ratio of output voltage to input current, which has units of impedance, usually denoted by the letter Z. – Jim Austin Jun 30 ’11 at 12:00
Footnote 4: Dynavector Systems Ltd., 3-2-7 Higashi-Kanda Chiyoda-ku Tokyo 101-0031 Japan. Phone: +81 (0) 3-3861-4341. Website: www.dynavector.com US Distributor: Toffco, 2020 Washington Ave., Unit 314, St. Louis, MO 63103. Phone: (314) 454-9966. URL: dynavector-usa.com
Footnote 5: The numbers after “Alnico” refer to special alloys of aluminium, nickel, cobalt, copper and iron. Alnico 5 is particularly rich in cobalt and slightly more magnetic than other Alnico alloys. Whatever the case, electric guitars with Alnico 5 based pickups have cleaner transients and a brighter tone. — Jim Austin
$3,800 for a high-quality phono stage, which is much better than the staggering $89,000 price tag for the CH Precision P1 phono stage reviewed last week. And that “could” sound even better for the price of 24.
I’d like to understand how a transimpedance phono stage can sound open and airy when loaded with such a low impedance cartridge. Years of experience with traditional phono stages has taught me that improper underloading can muffle the sound of a cartridge. Why doesn’t this happen with transimpedance phono stages?
Think of it like very low impedance speakers work, they draw/pull more current from the amplifier, let’s face it, easy to drive speakers tend to be lighter in color than low impedance speakers.
We loaded the Supex SD900 with 1000 ohm, 500 ohm, 100 ohm, 50 ohm and 10 ohm, the cleanest and best damping sound is at 10 ohm, but you need higher gain and it “could” be noisier if it was designed incorrectly.