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Herbie's Audio Lab's UltraSonic UltraSonic Rx-35 Damping Instrument
Tube Accessories by Herbie's Audio Lab
Our pricing for this product is the "MAP Pricing." This means that the prices shown here are the "minimum advertised prices" permitted by the manufacturer. Because these are already the lowest prices possible, the additional incentives usually available under "Frequent Flyer" program do not apply to this item.
Fits standard, straight-sided octals and all tubes approximately 1-5/16" to 1-7/16" diameter (33mm to 36mm), including 5AR4 (Amperex, G.E., Japanese "Mullard" copy, Mullard, JJ, Shuguang), "slim" 6CA7, 6H6, standard 6L6/5881, 6L6B, 6L6WGB, 6SF5 (metal shell), E34LS, medium-diameter EL34 (Philips, JJ, Mullard), EL34B (Shuguang), GZ34 (GE, JJ, Mullard, Raytheon, RCA), KT77.*
UltraSonic Rx Damping Instruments feature perfluoroelastomer O-rings (Kalrez formula 7075) that handle continuous temperature to 600°F (316°C). The firm-yet-compliant O-rings, held in place by homopolymer-modified Teflon pads and tempered titanium C-ring, establish a new acme of audio perfection.
While maintaining the same microdynamic speed, linearity, and detail of Herbie's UltraSonic series, Rx goes a bit further. Besides reducing microphonic anomalies, Rx blends in a subtle contra-vibration that allows a freer musical flow, curing a harsh and stealthy "electronics factor" or "dryness" that ultimately ails even some of the most finely honed audio systems.
A subtly nuanced yet distinct UltraSonic enhancement, Rx is in a league of its own. Your tube gear, no matter how hi-end or how close to sonic perfection, will achieve a fluid, musical potential virtually impossible to achieve until now.
Herbie's top-of-the-line and the world's finest vacuum tube damper, UltraSonic Rx is appropriate for all audio vacuum tubes. Scroll down for size listings, from smallest to largest.