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Herbie's Audio Lab's Preamp UltraSonic 30 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.
Preamp UltraSonic 30: Fits straight-sided octal tubes and other preamp tubes approximately 1-1/8" to 1-1/4" diameter (28mm to 32mm), including 12J5/GT, 12SL7/GT, 12SN7/GT, 5691, 5692, 6AH4, 6AU5, 6BL7, 6DN7, 6EA7, 6EM6, 6EM7, 6EW7, straight-sided 6F6G, 6FY7, 6H4, 6H4GT, glass 6J5, 6N8P, 6N9P, 6R7GT (glass T-9 bulb), 6SF5-GT (glass tube), 6SL7, 6SN7, 6SN7GT-series (6SN7GT, 6SN7GTA, 6SN7GTB, 6SN7WGT, 6SN7WGTA), PL504.
Our firm-yet-compliant isolation pads made of an exclusive silicone/silica formulation, coupled with tempered titanium C-rings, deliver unsurpassed microphonics reduction and amazingly natural sound. Harsh, acute and jaggedy vibrations are reduced in amplitude and smoothed so they do not cause irritating distortions or microphonics and without the damping instruments introducing any resonance or sonic anomalies of their own. With more of the full and pure potential of your preamp tubes realized, your audio system will achieve a new level of high performance.
Sleeveless pads allow use to 400° F (204° C), which is well above the temperature range of virtually all small-signal tubes, including amplifier input and driver tubes. Not recommended for extremely hot-running CH30 "supertubes" though, rectifier tubes, or output power tubes (use standard UltraSonic or UltraSonic Rx for these).
Preamp UltraSonics are our default recommendation for all small-signal tubes, including CD player, DAC, preamp, amplifier input/driver tubes, and others. (Preamp UltraSonic fits closely around the tube; ideal for Raysonic CD Players, tube microphones, and other limited-space applications.)