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The VT-series microphone preamplifiers from D.W. Fearn will change the way you think of audio quality. The transparency is astounding. Vocals sound smoother, warmer, more intimate, with a compelling presence. Any microphone and any sound will benefit from the improved clarity, definition, and lack of solid-state artifacts. The VT-2 preamplifier recreates the sound of classic tube preamps of the 1960s. Modern components and computer-optimized circuitry, unavailable during the vacuum tube era, elevate this design to a new level of performance. The VT-2 mic preamp was designed for optimal sonic quality, reliability, and durability. Like the best tube equipment of the 1950s and '60s, the VT-2 is built on a heavy-guage aluminum chassis, utilizing point-to-point wiring. Each vacuum tube is selected for minimum noise and microphonics, and maximum sonic clarity. The front panel switches control sealed, gold-contact precision relays for all audio switching, eliminating the possibility of dirty contacts degrading the sound and minimizing the internal audio path. Four class-A triode amplifier sections (in two tubes) in each channel comprise the entire active circuit. This surprisingly simple circuit, along with top-quality components and careful design optimization, results in the sonic superiority that the VT-2 has become known for. All over the globe, VT-2 preamps are in daily use in the world's best studios, as well as in home project studios, helping many top recording artists achieve the best possible sound. Important Note: Due to heat given off by tubes, D.W. Fearn recommends that you provide at least one rack unit (RU) of space above and below their audio rack products. For proper cooling and a refined look for your rack, we highly recommend using D.W. Fearn Vented Rack Panels (#180296). Single-channel version D.W. Fearn VT-1 also available (see #180271). History of the VT-1 and VT-2 Vacuum Tube Microphone Preamplifiers One day in 1991 I was going through some old maste
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John asked Do SSRs with DC inputs typically function with both sinking and sourcing input configurations?
I've been looking at various SSR datasheets and I do not see anything about the inputs being sinking or sourcing. Do they work in both configurations? Are they usually designed to be one? Thanks!
And got the following answer:
Source: the currents direction goes from the IC input to the driver. Sink: the current direction comes from the driver to the IC input. Look at a typical DC Solid State Relay: http://denethor.wlu.ca/pc300/triacs/ssrtec.pdf As you see, it has a photo transistor input. That means a diode. That means conventional input current flows from positive to negative, in other words, from the driver to the IC input. That means, by the above definitions, it functions as a current sink. .
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