#1
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Kt150
Hi,
Was wondering if the new KT150 tube can be fitted in the Ref150? It is not something I plan to do immediately, but when the tubes need replacing would consider it if Ok to do. Many thanks Marc.
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ARC Ref150, Ref40, DCS Scarlatti, ML CLX, ML Descent I * 2, Transparent MM2 cables |
#2
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The KT150 isn't a replacement for a 6550; it replaces an EL34.
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Myles Astor, Senior Editor., Positive-Feedback.com, Goldmund Telos 300 amplifier, Goldmund Mimesis 37S Nextgen preamplifier, Doshi EVO phono and tape stages; Zellaton Plural EVO speakers; VPI Vanquish Turntable, VPI 12-inch Fat Boy gimbal arm and SAT LM-12 arm; Lyra Atlas SL Lambda, Fuuga mk.2, vdh Colibri Master Signature cartridges; Technics 1506/FM heads; Various cables including TA, MIT, Kubala-Sosna, Skogrand, Viero L3 Equilibrio speaker cables, Audience, SRA Craz 3 rack, Isobase and OHIO Class XL+2.1 platforms. |
#3
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Agreed, however can it be used in place of the KT120?
Thanks M.
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ARC Ref150, Ref40, DCS Scarlatti, ML CLX, ML Descent I * 2, Transparent MM2 cables |
#4
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No a KT120=6550.
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Myles Astor, Senior Editor., Positive-Feedback.com, Goldmund Telos 300 amplifier, Goldmund Mimesis 37S Nextgen preamplifier, Doshi EVO phono and tape stages; Zellaton Plural EVO speakers; VPI Vanquish Turntable, VPI 12-inch Fat Boy gimbal arm and SAT LM-12 arm; Lyra Atlas SL Lambda, Fuuga mk.2, vdh Colibri Master Signature cartridges; Technics 1506/FM heads; Various cables including TA, MIT, Kubala-Sosna, Skogrand, Viero L3 Equilibrio speaker cables, Audience, SRA Craz 3 rack, Isobase and OHIO Class XL+2.1 platforms. |
#5
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Good Morning Mark.
Spec wise the KT150 is not wildly dissimilar to the KT120 , altho perhaps not a straight forward plug n play substitute , I would be surprised were ARC not evaluating this valve , If only for future product development ~ KT150 ~ The plate dissipation is 70 watts G2 is 9.0 watts, Cathode current is 275 ma Filament current is 1.75 -2 amps Max plate voltage is 850 Screen is 650 volts Distortion in class A 400v plate 225 v screen Overall Harmonic Distortion is similar to 6550 at 14%. KT120 ~ The plate dissipation is 60 watts G2 is 8.0 watts, Cathode current is 250 ma Filament current is 1.75 -1.95 amps Max plate voltage is 850 Screen is 650 volts Distortion in class A 400v plate 225 v screen Overall Harmonic Distortion is similar to 6550 at 14%. |
#6
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Many thanks for clarifying. From above seems unlikely it for would be possible to interchange.
Rgds Marc.
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ARC Ref150, Ref40, DCS Scarlatti, ML CLX, ML Descent I * 2, Transparent MM2 cables |
#7
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Good Morning ARC Owners .
FYI , Kalvin Dahl's current position on this matter . "Until engineering tests the KT150s I would not use them in the Ref 150." It may prove to be the case that the Mains / KT ratio of the Ref 75 might receive sanction , however we may speculate that the Ref 150's 8 x KT / Mains ratio may prove too near the Red Line without major surgery , if at all. However it would seem prudent to await the 'The Word' from ARC central on this matter regardless of model , especially for units still under warranty . Jasper. |
#8
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I heard ARC has been testing the KT150's on the VSi75 as a drop in replacement and have liked what they have heard sonically as well as the increase in power. But they have more testing to do before they can sign off on the stability and safety. Apparently the open assembly makes it easier to try out on the VSi75. Can anyone speculate the expected wattage increase? Does anyone have first hand knowledge of the sonic differences with the KT120's?
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#9
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Thank you for the sit rep ariess .
We can but hope that my Ref 150 8 x OP tube / Mains transformer ratio theory may transpire to be unfounded Old Pants ! Last edited by Harlequin; 10-30-2013 at 02:46 PM. |
#10
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Thank you for the update
Marc.
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ARC Ref150, Ref40, DCS Scarlatti, ML CLX, ML Descent I * 2, Transparent MM2 cables |
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