UltraSonic SS: Sonic perfection for your small-signal tubes

UltraSonic SS-9 Damping Instrument

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UltraSonic SS is designed specifically for small-signal tubes. By reducing microphonic anomalies, the musical result is an "undamping" or "unveiling" of the musical vitality and ambience of the originally recorded event. Firm-yet-compliant isolation pads made of an exclusive silicone/silica formulation, coupled with tempered titanium C-rings, deliver amazingly natural sound. Harsh, acute vibrations are reduced in amplitude so they do not cause irritating distortions, fuzz or glare, allowing the full musical potential of the tubes to fully blossom. With more of the inherent potential of your preamp and small-signal 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 most small-signal tubes, including amplifier input and driver tubes. Not recommended for extremely hot-running 6H30 "supertubes," 5687/6900 triodes, 6973 and other beam power tubes, EL84, rectifier tubes, output power tubes, or other extremely hot-running tubes (use UltraSonic Rx or HAL-O III for these).

UltraSonic SS is our primary recommendation for all cool to warm-running small-signal tubes listed below, for use with CD player, DAC, preamp, and amplifier. (UltraSonic SS dampers fit closely around the tube; ideal for Raysonic CD Players, tube microphones, and other limited-space applications.) Also great for capacitors.


UltraSonic SS-7: This damping instrument fits small-signal seven-pin miniature tubes approximately 5/8" to 3/4" diameter (16mm to 19mm), including 0A2, 0B2, 0C2, 1S5, 12AE6, 12FK6, 12FM6, 304B, 3A5, 3S4, 403A/B, 408A, 5591, 5651, 5654, 5654SQ/W, 6005, 6186, 6AK5, 6AK5W, 6AL5, 6AN4, 6AQ5, 6AQ6, 6AU6, 6BH6, 6C4, 6ER5, 6FG5, 6FQ5A, 6FS5, 6FY5, 6GK5, 6J1, 6J1P-EV, 6J6, 6N4, 6P17, 6Z4, 7543, 9001, DCC90, DL92, EC90, EF95, M8100, OA2, OB2, OC2, SBA6.

UltraSonic SS-7: $15.45 ea.
4 or more: $14.95 ea.
UltraSonic SS-7 Damping Instrument


UltraSonic SS-9: This damper fits small-signal miniature nine-pin tubes 3/4" to 7/8" diameter (19mm to 22mm), including 12AT7/ECC81, 12AU7/ECC82, 12AV7, 12AX7/ECC83, 12AY7, 12AZ7, 12B4, 12BH7, 12BY7, 12BZ7, 12DW7, 12FQ7, 2C51, 396, 396A, 417, 5670, 5751, 5755, 5814, 5842, 5879, 5963, 5965, 6072, 6189, 6201, 6267, 6350, 6385, 6414, 6519P, 6688, 6829, 6922, 6955, 6AN8, 6BL8, 6BQ7, 6BZ7, 6C19P, 6C45, 6CG7, 6DJ8/ECC88, 6EU7, 6FQ7, 6GC7, 6GH8(A), 6GU7, 6GW8, 6H23N, 6H6PI, 6N2, 6N2P, 6N23P, 6N3P, 6N6P, 6S4, 6U8(A), 6V4, 7025, 7044, 7058, 7062, 7119/E182CC, 7199, 7308, 7AU7, 8416, Cca, E80F, ECC40, ECC802S, ECC803/S, E288CC, E88CC, EC86, ECC85, ECC86, ECC90, ECF80, ECL86, EF86, EL821, EL86, EM84, EZ80, M8162, PC88, PCC88, T-6 1/2 bulb.

UltraSonic SS-9: $15.49 ea.
4 or more: $14.98 ea.


UltraSonic SS-25: Fits small-signal straight-sided octal tubes approximately 1" to 1-1/16" diameter (23mm to 28mm), including metal 12SC7, metal 12SJ7, metal shell 6F6, 6J5, 6R7, metal 6SJ7, "slim" 6SN7.

UltraSonic SS-25: $15.95 ea.
4 or more: $15.49 ea.


UltraSonic SS-30: This damper fits small-signal straight-sided octal tubes approximately 1-1/8" to 1-1/4" diameter (28mm to 32mm), including 12J5/GT, glass 12SJ7, 12SJ7GT, 12SL7/GT, 12SN7/GT, 5691, 5692, 68HC, 6AH4, 6AU5, 6BL7, 6DN7, 6EA7, 6EM6, 6EM7, 6EW7, straight-sided 6F6G, 6FD7, 6FY7, 6H4, 6H4GT, glass 6J5, 6J8P, 6N8P, 6N9P, 6R7GT (glass T-9 bulb), 6SF5-GT (glass tube), 6SH7, glass 6SJ7, 6SJ7GT, 6SL7, 6SN7, 6SN7GT-series (6SN7GT, 6SN7GTA, 6SN7GTB, 6SN7WGT, 6SN7WGTA), 7N7, C3G, MT8 bulb, PL504.

UltraSonic SS-30: $16.29 ea.
4 or more: $15.89 ea.
UltraSonic SS-30 Damping Instrument


UltraSonic SS-35: This damping instrument fits small-signal tubes approximately 1-5/16" to 1-7/16" diameter (33mm to 36mm), including ECC33 and ECC35.

UltraSonic SS-35: $16.59 ea.
4 or more: $16.19 ea.


UltraSonic SS-40: This damping instrument fits bottle-shaped and other small-signal tubes approximately 1-1/2" to 1-5/8" diameter (37mm to 44mm) including Sophia Electric "bottle" 6SL7 and 6SN7.

UltraSonic SS-40: $16.89 ea.
4 or more: $16.49 ea.
UltraSonic SS-40 Damping Instrument with Sophia Electric 6SN7


UltraSonic SS-50: This damping instrument fits Shuguang Treasure CV 181-Z and other small-signal tubes 1-3/4" to 2-1/8" diameter.

UltraSonic SS-50: $17.69 ea.
4 or more: $17.29 ea.


Changing gear? UltraSonic SS isolation pads can be slid off one titanium C-ring and onto another. If you need a different size than what you have, spare C-rings are available, so you don't have to buy a whole damping instrument to change sizes.

 Titanium C-Ring Only (no pads) 
UltraSonic SS sizes 7 thru 50
$5.89 to $7.59 ea.
(4 or more, one size: 10% off)


UltraSonic SS Isolation Pad
$3.29 ea.
(12 or more: 5% off)


90-day no-risk trial. If not satisfied, simply return your Damping Instruments within 90 days for a complete refund.

Lifetime warranty. If anything ever goes wrong, simply return any Damping Instrument to Herbie's Audio Lab and it will be repaired or replaced and returned to you at no cost.

All parts and materials made in USA

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