4 - Herbie's Audio Lab Ultra Sonic 40 Tube Dampers in excellent condition for sale. I used these to good effect on the 5881 power tubes in my amp that I no longer own, hence the sale. Will fit tubes 1-1/2" to 1-5/8" diameter (37mm to 44mm).
$20.00 inc. FREE USPS SHIPPING from 90403 in the US ONLY. Payment via PayPal or Money Order/Certified Check.
Detailed description from Herbie's Audio Lab website:
"An affordable alternative to Herbie's top-of-the-line Rx, original UltraSonic Damping Instrument with titanium C-ring delivers intricate detail and imaging, linear frequency response, highly faithful to the source components and audio system. Specially formulated modified PTFE isolation pads absorb micro-vibrations to provide a revealing soundstage with reduced grunge and glare. Imbedded fiberglass sleeves surrounding the pads enable a firm grip. For continuous use to 525°F (274°C), original UltraSonics are appropriate for all home audio vacuum tubes, including small-signal preamp, rectifier, and output power tubes.
Fits wide and bottle-shaped octals and all tubes approximately 1-1/2" to 1-5/8" diameter (37mm to 44mm), including 0A3, 0C3, 0D3, 1626, 19, 27, 30, 37, 520B (near bottom of tube), "fat-bottle" 5AR4 (Amperex, Mullard, T-11 bulb), 5AW4, straight-sided 5R4-types, straight-sided 5U4 and 5U4-GB (T-12 bulb), 5V3, 5V4, straight-sided 5Y3GB, small-bottle 5Y3GB (Mazda), 5Y4GA, 5Z4P, 6080, "slim" 6550, straight-sided 6AS7, 6BY5/G/GA (straight-sided), 6C6, "Big Bottle" 6CA7 (E-H), "Black Bottle" 6CA7-Z, 6F8G, 6HB5, bottle-shape 6J5 (ST-12 bulb), 6JN6, 6L6GC (Mazda, JJ, GE, RCA, Sylvania, Tungsol), 6LF6, 6P3P, Sophia 6SL7, Sophia 6SN7, 7027, 7236, 76, 84, 8417, 85, "Fat Bottle" EL34 (Big Bottle), EL509, straight-sided GZ32, KT90, OC3, PL509, VR105.*"
