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Ultra SL Preamplifier
The crowning achievement of our complete product line redesign. Our original Transcendence Seven preamplifiers have astonished nearly everyone who has heard them. Now be prepared to be astonished all over again. The preamp features a unique new active ten stage high current, wide band, analog regulated power supply section, with separate regulator sections for each section of each circuit. For even more stability and wide band low noise performance, the new circuits are all contained on a shielded ground plane mother board. New for 2008, the Ultra SL preamp has been recalibrated for very high current 6N1P line tubes. This extends the range, dynamic range, transient response, and clarity even further, with an absolutely grain free presentation and a huge three dimensional wall to wall and beyond sound stage. If absolute faithfulness to the music with nothing added or glossed over is your goal, you can likely do no better at any price. We started with our basic patented design ideas that have worked so well, and provided even better power supply isolation between tube sections and mos-fet section with a much higher capability MOSFET buffer/driver circuit, all running Class A, and came out with simply astonishing results; the new Ultra SL preamplifier. The Ultra SL preamp tells us that simpler is best if you can make it work to perfection, and we have. Our famous patented Fet Valve transimpedance gain cell just loves the high current drive of the 6N1P line tube and the much higher current gain of our power MOSFET design in the loop isolator circuit. The circuit simply comes alive with pure musicality, dynamic range, transient attacks, and range extension we had not thought possible. Not stopping there, we designed a new headphone driver circuit to match the performance of the line stage. Now you don’t even need a power amp or speakers to hear music as never before, just high quality headphones. To provide even higher quality performance and satisfaction, all SL chassis preamps now come in a new larger and more attractive chassis with higher quality gold contact pushbutton switches. If you require more control options than the Ultra SL preamplifier offers and/or tone controls, be sure to check out the Ultra EC preamplifier. (Compare chassis features here.) Available factory-wired in the SL chassis. The Ultra SL circuits are available as factory upgrades to all existing Fet Valve and Transcendence SL preamplifiers. We always strive to support our existing customers with the most modern and musical circuits possible, retaining the quality hardware that does not wear out and need not be replaced. Optional
performance enhancements for the Ultra preamps: Ultra RIAA Phono Preamplifier has been completely redesigned with the same high current Class A power MOSFET output driver/buffer and circuit topology as the new line section, with the exception that 12AX7A tubes are used for the necessary open loop voltage gain to make the RIAA feedback loop work perfectly. The improvement in phono performance with the new regulated power supplies is simply astonishing. Your records will exhibit the dynamic range and transient response of well recorded CDs now, but with all the innate musicality of vinyl. The Ultra phono section works great with any normal output phono cartridge, head amp, or moving coil step-up transformer. Installed in the Special location replacing one set of line level inputs. Buffered Tape Outputs provide a dedicated, fast, high-current circuit to enhance tape loop performance. Isolate your sources from tape output loads. Many tape decks and signal processors are terrible loads, causing degraded audio performance, especially when the tape decks or processors are connected but turned off! Make better sounding tapes and significantly improve the overall musical performance of your system when the tape loops are used. 240 V Wiring. The Ultra preamplifier can be supplied with 240 V/50 Hz power transformers for foreign single phase 220/240 V operation.
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