HAL-OtmVacuum Tube Damping Instrument

A specially treated Teflon ring holds proprietary, heat-resistant damping pads firmly against the vacuum tube, virtually eliminating microphonic vibrations. The audio result is astounding -- the tube's sound is made more clear and precise, less fuzzy. Tonal qualities are rendered more true and natural, subtle passages more distinguishable. Three-dimensional qualities are better focused. Improvements occur evenly throughout the entire audio spectrum, from the deepest bass through the highest frequencies. These damping instruments outperform ordinary tube dampers by leaps and bounds. Recommended by Tenor Audio for use on world-class Tenor amps. 90-day no-risk trial. If not satisfied, simply return your HAL-O Vacuum Tube Damping Instrument 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. "These things really work. The lucidity and focus are really quite phenomenal. They're better than anything else on the market."---Bob O'Neill, Bound for Sound

HAL-O^tm 7 Vacuum Tube Damping Instrument

For small tubes approximately 5/8" to 3/4" in diameter (16 to 19 mm).

Fits: miniature seven-pin tubes, including 0A2, 6AN4, 6C4, 6ER5, 6GK5, 6X4, 12X4, 7543, EC90, and SBA6. *

HAL-O^tm 9 Vacuum Tube Damping Instrument

For all tubes approximately 3/4" to 7/8" in diameter (19 to 22 mm).

Fits all standard nine-pin tubes, including 5842, 6267, 6688, 6BQ5/EL84, 6BM8, 6CA4, 6C45, 6CG7, 6DJ8/ECC88, 6H23, 6H30, 6N3P, 6189, 6350, 6414, 6922, 6955, 6973, 7119/E182CC, 7189, 7199, 12AT7/ECC81, 12AU7/ECC82, 12AX7/ECC83, 12AZ7, 12BH7, 12BY7, ECL82, EZ80, SV83, WE417. *

HAL-O^tm 24 Vacuum Tube Damping Instrument

Fits 6134, 6AC7, 6SD7, 6SK7 and all tubes approximately 1" in diameter (22 to 26 mm). *

*Tube diameters and shapes vary among manufacturers. To estimate your tube diameter, just place a wooden or metal ruler against the side of your tube and "eyeball" the size. Or measure the circumference and divide by pi.

HAL-O^tm 27 Vacuum Tube Damping Instrument

For all tubes from 1 1/16" to 1 3/8" in diameter (26 to 35 mm).

Fits standard octals such as 5AR4, 5Y3, 6BX7, 6CA7, 6EM7, 6F8, 6SN7, 6L6, 6SJ7/12SJ7, 6SK7/12SK7, 6SL7, 6V6/5V6, 6X5, straight-sided 6Y6, 7591, PL504/EL504, VT-231. Also fits standard or slim straight-sided EL34. *

HAL-O^tm 35 Vacuum Tube Damping Instrument

For all tubes approximately 1 3/8" to 1 3/4" in diameter (34 to 44 mm).

Fits 5U4, 5V3, 5V4, 6080, bottle-shape 6CA7, 6L6GC/5881, 6Y6, 7027, 8417, FU4, GZ37, straight-sided KT88, KT90. *

HAL-O^tm 45 Vacuum Tube Damping Instrument
......(with X-treme Temperature sleeves)

For all tubes approximately 1 3/4" to 2 1/8" in diameter (44 to 54 mm).

Fits standard 2A3 (use HAL-O 60 for extra-wide 2A3), 26, 45, 572-10, 6B4, 6C33, 6550, 811, wide-body KT-88, also Coke bottle-shaped octals like 6AS7, 6L6G, CV181/ECC32, and GZ33. *

X-Treme Temperature sleeves increase heat resistance of the isolation pads from 460° F. to an extreme 572° F. (300° C).

HAL-O^tm 60 & 70 Vacuum Tube Damping Instruments
......(with X-treme Temperature sleeves)

HAL-O 60: Fits 211, extra-wide 2A3, 300B, 813, 845, 872, GZ37 and other jumbo-size tubes from 2 1/8" to 2 5/8" in diameter (53 to 65 mm). * HAL-O 70: Fits 805 and other giant tubes from 2 1/2" to 3" in diameter (63 to 76 mm). *

KRONZILLA Vacuum Tube Damping Instrument:

*Tube diameters and shapes vary among manufacturers. To estimate your tube diameter, just place a wooden or metal ruler against the side of your tube and "eyeball" the size. Or measure the circumference and divide by pi.