HAL-O III brings out the best potential in extremely hot-running audio rectifier, power tubes and other sensitive vacuum tubes. HAL‑O III subdues heater-generated vibrations and common microphonics, allowing a truer rectified current and truer amplified signal. A less-fuzzy, cleaner rectified current will typically cause other audio tubes in a component to render the music more clearly. Tube output will be more musical, more energetic and less vague, while maintaining your system's unique nature and character.
With spring-tempered titanium C-ring and annealed titanium isolation pads, HAL‑O III is appropriate for all vacuum tubes, ideal for extremely hot-running tubes, able to handle continuous tube heat in excess of 1000° F (538° C).
HAL-O III-7: For 7-pin miniature tubes and all tubes approximately 5/8" to 3/4" diameter (16mm to 19mm), including 0A2, 0B2, 0C2, 1S5, 12AE6, 12FK6, 12FM6, 12X4, 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, 6J1P-EV, 6J6, 6N4, 6P17, 6X4, 6Z4, 7543, 9001, DCC90, DL92, EC90, EF95, M8100, OA2, OB2, OC2, SBA6. (Most 7-pin miniature tubes, at about 19mm diameter [3/4"], can also use size 9.)
HAL-O III-9: Fits miniature 9-pin tubes and all tubes 3/4" to 7/8" diameter (19mm to 22mm), including 10GV8, 12AT7/ECC81, 12AU7/ECC82, 12AX7/ECC83, 12AY7, 12AZ7, 12B4, 12BH7, 12BY7, 12BZ7, 12DW7, 12FQ7, 2C51, 396, 396A, 417, 5670, 5687, 5751, 5755, 5814, 5842, 5879, 5963, 5965, 6072, 6189, 6201, 6267, 6350, 6385, 6414, 6519P, 6688, 6829, 6840, 6900, 6922, 6955, 6973, 6AN8, 6BL8, 6BM8/ECL82, 6BQ5/EL84, 6BQ7, 6BZ7, 6BW4, 6C19P, 6CA4, 6C45, 6CG7, 6CS7, 6DE7, 6DJ8/ECC88, 6E5P/6E5PI, 6EJ7, 6EU7, 6FQ7, 6GC7, 6GF7A, 6GH8(A), 6GU7, 6GW8, 6H23N, 6H30, 6H6PI, 6N1P, 6N2P, 6N30, 6N30P, 6N3P, 6N6P, 6P1, 6P1P, 6P1P-EV/6II1II-EB, 6S19P, 6S4, 6U8(A), 6V4, 7025, 7044, 7058, 7062, 7119/E182CC, 7189, 7199, 7308, 7788, 7AU7, 7DJ8, 8416, CCa, D3a, E288CC, E80CC, E80F, E88CC, EC86, ECC189, ECC802S, ECC803/S, ECC81, ECC82, ECC83, ECC85, ECC86, ECC99, ECF80, ECL86, EF184, EF800, EF86, EL821, EL84, EL86, EM84, EZ80, EZ81, M8162, PCC88, PCL82, PCL86, SV83, (T-6 1/2 bulb).
HAL-O III-25: Fits all tubes approximately 1" to 1-1/16" diameter (23mm to 28mm), including metal 12SC7, metal 12SJ7, 5693, "slim" 5Z4, "slim" 6AU4, metal shell 6F6, 6J5, 6R7, metal 6SC7, metal 6SJ7, "slim" 6SN7, metal 6V6, 6X5.*
HAL-O III-30: Fits narrow, straight-sided octal tubes and all tubes approximately 1-1/8" to 1-1/4" diameter (28mm to 32mm), including 0A3A (straight-sided), 1266, 12AX3, 12J5/GT, glass 12SJ7, 12SJ7GT, 12SL7/GT, 12SN7/GT, 3CM, 437A, 4P1L, 5691, 5692, 5852, "slim" 5AR4 (G.E., Sovtek/Reflektor, T-9 bulb), 5Y3, 5Y3GA, 5Y3GT, "wide" 5Z4, 6106, 68HC, 6AH4, 6AU4GT, 6AU4GTA, 6AU5, 6AX4GT, 6AX4GTA, 6AX4GTB, 6BL7, 6C5S, 6CJ3, 6D22S, 6DA4/6DA4A, 6DN7, 6EA7, 6EM6, 6EM7, 6EW7, straight-sided 6F6G, 6FD7, 6FY7, 6H4GT, 6J8P, 6K11, "slim" 6L6, 6N8P, 6N9P, 6R7GT (glass T-9 bulb), 6SF5-GT (glass tube), 6FM7, 6SC7 (glass tube), 6SH7, glass 6SJ7, 6SJ7GT, 6SL7, 6SN7, 6SN7GT-series (6SN7GT, 6SN7GTA, 6SN7GTB, 6SN7WGT, 6SN7WGTA), 6V6, 6V6GT (GE, Sylvania, Tung-Sol), 6X5G/GT/WGT, 6Y6, 7355, 7591, 7868, 7N7, C3G, C3M, EC8020, "narrow" EL34 (E-H, Mullard, SED "Winged C," Siemens, Svetlana, Telefunken, NOS Tesla, Tung-Sol), EL34/6CA7 (Svetlana), EL34B (Tung-Sol), GZ30, MT8 bulb, OA3A (straight-sided), PL504, T-9 bulb, VT-231.*
HAL-O III-35: 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 (Tung-Sol), 6H6, standard 6L6/5881, 6L6B, 6L6GT, 6L6WGB, 6SF5 (metal shell), 6V6GT (RCA), 6V6S (JJ), E34LS, ECC33, medium-diameter EL34 (Amperex, Philips, JJ, some Mullards, Valvo), EL34B (Shuguang), GZ34 (GE, JJ, Mullard, Philips, Raytheon, RCA), KT77.*
HAL-O III-40: Fits wide and bottle-shaped octals and all tubes approximately 1-1/2" to 1-5/8" diameter (37mm to 44mm), including 0A3 (bulb-shape), 0C3, 0D3, 1626, 19, 27, 30, 37, 3DG4, 520B (near bottom of tube), 5881, "fat-bottle" 5AR4 (Amperex, Mullard, T-11 bulb), 5AW4, straight-sided 5R4-types, straight-sided 5U4 and 5U4-GB (T-12 bulb), 5V3, 5V4, 5Y3GB, 5Y4GA, 5Z4G, 5Z4P, 6080, "slim" 6550, straight-sided 6AS7, 6BY5/G/GA (straight-sided), 6C6, 6C8G, "Big Bottle" or Fat Bottle 6CA7 (E-H, Sylvania, GE, etc.), "Black Bottle" 6CA7-Z, 6F8G, 6HB5, bottle-shape 6J5 (ST-12 bulb), 6JN6, 6L6GC (E-H, Mazda, JJ, GE, RCA, Sylvania, Tungsol), 6L6WGC, 6LF6, 6P3P, Sophia Electric "bottle" 6SL7 and 6SN7, 7027/A, 7236, 76, 84, 8417, 85, CV3798, "Fat Bottle" EL34 (Big Bottle), EL509, G75/2D, straight-sided GZ32, "slim bottle" GZ37, KT90, OA3 (bulb-shape), OC3, OD3, PL509, QS150/40, QS75/40, VR105, VR75/40.*
HAL-O III-50: For all tubes approximately 1-3/4" to 2-1/8" diameter (45mm to 54mm), including 10Y, 101F, 1610, 2A3 (Brimar, E-H, E-H Gold, RCA, Sovtek, Sylvania, Tung-Sol), 26, 274B (Western Electric), 307A, 35, 350B, 3A/110A, 3A/110B, 3D21A, 421A, 422A, 45 (RCA, Sylvania, TJ, Tung-Sol), 46 bottle-shape, 572-10, 5998, bulb-shaped 5R4-types, 5R4WGA/B (Tung-Sol), bottle-shape 5U4G, 5V4, 5Y3G (Sylvania), 5Z3, 5Z3P/A, 5Z4G (Brimar), standard and wide 6550 (E-H, GE, Philips, RCA, SED, Svetlana, Sylvania, Tung Sol), 6550A, 6550C, bulb-shape 6AS7, 6AS7G, 6B4, 6B4G, 6BY5/G/GA (bottle-shape), 6CA7-Z, 6C33C (upper portion of tube), bulb-shape 6F6G, 6H13, 6H13C, bulb-shape 6L6G, 6N13P, 6Y6G, 71A, 80 bottle-shape, 801/801A, 807, straight-sided 811, 814, C327 ("bulb" 27), CX4, bottle-shaped octals like AZ4, CV181/ECC32, CV181TII (Psvane 6SN7), CV181-Z (Shuguang), CV378 (Mullard), EL156, EL37, bottle-shaped GZ32 (Mullard), GZ33, KT120, KT66, KT88 (E-H, EAT, GEC, Gold Lion/Genalex, JJ/Tesla, SED, Shuguang, Sovtek, Svetlana), PX4, ST-14 bulb, ST-16 bulb, U52.*
HAL-O III-55: For jumbo-size tubes 2-3/16" to 2-5/16" diameter (55mm to 59mm), including 101D/101F, narrow 211 (RCA), 211/VT-4C (GE), 2A3 (EML), 2A3-Mesh (EML), 274A, 300B "Balloon" (KR), Svetlana 300B, Takatsuki TA-300B, 45 (EML), 46 globe-shape, large bottle 5Y3GB (smaller Mazda uses size 40), 80 globe-shape, "narrow" 805 (RCA, United), 829B, 841, 842, narrow 845 (Amperex, RCA), 845A (Shuguang), 872, GE211, "Big Bottle" GZ37, KT150 (specify size "60" in comments section of order form), SV811-10, ST-17 bulb, T-18 bulb.*
HAL-O III-65: With plenty of flex to accomodate a wide range of tube diameters, fits giant tubes from 2-3/8" to 3" diameter (60mm to 76mm), including 101D "tennis ball," 101J, 102B, wide 211 (Sophia, TJ), 274B (EML, Shuguang, Sophia, Valve Art), 2A3-40W (JJ), 2A3 Meshplate (Sophia, TJ), 2A3 Globe Meshplate (Sophia, TJ), 2A3C (Shuguang), 300B (AVVT, E-H, EML, JJ/Tesla, Sovtek, KR, TJ/Full Music, Western Electric), 300B-XLS (EML, KR), Meshplate 300B (EML, Golden Dragon, TJ, Sophia, Shuguang, Valve Art), 300B Globe Meshplate (Sophia, TJ), 32B, Globe 45 (TJ/Full Music/Sophia), 45C, 45N, EML 45-mesh, 50, 520B, EML 5U4G-Mesh & 5Z3-Mesh, 6C33C (wide portion of tube), 803, "wide" 805 (Amperex, Shuguang, TJ), 811A, 813, wide 845 (Sophia, Shuguang metal plate, TJ), 845B (Shuguang), F2A, GM70, PX25, ST-18 bulb, ST-19 bulb, T-20 bulb.*
HAL-O III-100: With extra-heavy-gauge stainless steel C-ring and pure titanium isolation pads, HAL-O III-100 thoroughly tames microphonics in super-giant tubes 3-1/2" to 4-5/8" diameter (89mm to 118mm), including 833, KR T-1610 (Kronzilla), and tubes using T-36 bulb.
I have heard and read many positive reviews on Herbie's dampers over the years but never thought they would make a large improvement over the manufacture provided rings. I was way wrong. These made a huge improvement in SQ and are well worth the price. Per my title buy them now!
I was skeptical before ordering as I was afraid the dampers would make the sounder cleaner but perhaps also more technical, no as smooth as what you expect a tube amp to sound like.. Nothing of the kind, the sound did not lose any of the smooth tuby character. However, the biggest surprise for me what a huge improvement in soundstage. These babies are expensive but well worth the money. On the downside, I'm not impressed by customer service - I wrote twice, no response (I used the form, perhaps I should have just copied the email address).
placement is critical there good for new tubes not N.O.S. but in the right spot they work great better focus better imaging better depth a+
I ordered two tube dampers for my amplifier an ARC 75 SE. I put these tube dampers on the 6H30 tubes. I can only say wow what a difference it made. The sound picture got bigger, it was as if a film was lifted away from the speaker. The base became much tighter and with more texture. But where these tube dampers really perform amazingly is the ability to bring sound to life. Just as if everything comes alive and the treble becomes more relaxed and more accurate without being intrusive.
Huge difference using this on the rectifier 6550 tungsol tube in my arc Ref 6. Placed on the widest part of the tube. Improved bass and seperation. Also used on the input tube.
Felix Audio Euforia Tube headphone Amp: ...wow, the Halos reallly opened up the tubes, (vintage NOS Tung Sol 7236 Dual Power Triode Amplifier Tube from SAGE Mainframe Computer and 1955 CBS Hytron 6sn7gt black plate tubes) on my already fantastic Felix Audio Euforia! Without your Halos...sound was flat and lack depth and bass was thin...when I added the Halos...the tubes jumped up to a heavenly level of pure tonal balance and depth! It is just amazing how the Halos allow the electrons to be free to fly..without any glass envelope to restrict or add vibrations...the glass envelope just disappears! I will never remove the Halos..or the tenderfeet!
I recently purchased HAL-O IIIs for the Sophia Electric Aqua 274B rectifier tubes in my 300B monoblocks. I have been very pleased with the Aqua's, so I wasn't expecting a big difference, but I was wrong. It was one of those gee-I-never-heard-that-before kind of thing. Being a bass player, new unheard textures in the bass were the first things I noticed. Beyond that, the overall sonic presentation was more focused and had more impact, like the amps had better current to work with. Highly recommended.
After updating the complete power section with Mundorf Components which brought about a hugh change in clarity, space, dynamics, I exchanged the power tube by a NOS Tungsol. But Herbie's dampers brought the icing on the cake. My pre is now playing in a completely different league.
First, the quality of these tube dampers are excellent and I'm sure will last for many years. Secondly, since I just received these just the other day I'm still assessing their effectiveness in my system, but I can tell the amplifier's sound is tighter than before the dampers were utilized. Time will tell, but the tube dampers form Herbie's are a solid product and seem to perform as prescribed. HSK
Very pleased with the result on sound quality, using the HAL- O-111s 65 for the Shuguang Black Treasure 300B-Z output tubes and HAL-O 111 9 for the 6H23N driver tubes on my Audion PSE 300B Mono blocks. The sound improved over the first couple of days. The noise floor dropped and the level of low level detail really came through. The ambience with and around the instruments and subtleties/ delicacies/ emotion of the voice became evident. The width and depth of image also improved. The “balance” / coherence of the music seems to be better. The original reason for trying out the stabilisers was to eliminate high frequency “aee” “eee” grating. That has reduced considerably, but a residual is still there. Will have see what other tweaks I could do!
Love these!!! The HAL-O III Stabilizers are THE BEST!!!
I purchased the Hal-O III dampers for the KT-88 power tubes in my Zesto Audio Bia 120 amplifier after installing UltraSonic SS dampers on all of the 12AX7 and 12AU7 tubes in my phono stage, preamp and amp. While the Hal-O III dampers provided an improvement in background noise, stage depth, and image definition, it wasn't quite to the degree the dampers on the smaller tubes provided in those areas. In addition, the UltraSonic SS dampers on the smaller tubes also tightened up the bass, extended the top end and smoothed out some edginess. The addition of the Hal-O III and UltraSonic SS dampers have provided more detail while also making the music feel more natural and relaxed. Listening fatigue has been reduced and musical enjoyment has been increased making these a great value.
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