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.
HAL-O III brings out the best potential in audio rectifier and power tubes and other sensitive tubes. HAL-O III subdues heater-generated vibrations and common microphonics, allowing a truer rectified current and truer musical signal. Tube output will be a little cleaner sounding, a little more musical, 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).
Fits narrow, straight-sided octal tubes and all tubes approximately 1-1/8" to 1-1/4" diameter (28mm to 32mm), including 12J5/GT, glass 12SJ7, 12SJ7GT, 12SL7/GT, 12SN7/GT, 3CM, 5691, 5692, 5852, "slim" 5AR4 (G.E., Sovtek/Reflektor, T-9 bulb), 5Y3, 5Y3GA, 5Y3GT, "wide" 5Z4, 6106, 6AH4, 6AU4GT, 6AU4GTA, 6AU5, 6BL7, 6CJ3, 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), glass 6SJ7, 6SJ7GT, 6SL7, 6SN7, 6SN7GT-series (6SN7GT, 6SN7GTA, 6SN7GTB, 6SN7WGT, 6SN7WGTA), 6V6, 6V6GT (GE, Sylvania, Tung-Sol), 6V6S, 6X5G/GT/WGT, 6Y6, 7355, 7591, 7868, C3G, C3M, "narrow" EL34 (E-H, SED "Winged C," Siemens, Svetlana, Telefunken, NOS Tesla, Tung-Sol), EL34B (Tung-Sol), GZ30, PL504, VT-231.*