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Thread: Anyone with experience or thoughts on Audio Research's new KT 120 tubes?

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    Addicted to Best! Lee's Avatar
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    Anyone with experience or thoughts on Audio Research's new KT 120 tubes?

    Dave Gordon at ARC recommended I check out the KT 120 since I am having my ARC VT-100 amp serviced and retubed.

    Anyone have any thoughts on this tube versus the old ARC 6550?

    I'm curious but past experience has suggested that tube upgrades at ARC are very carefully considered.

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    Site Founder And Administrator Steve Williams's Avatar
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    Lee

    we have several threads here on the KT120 that answers a lot of your questions
    Steve Williams
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    Site Founder And Administrator Steve Williams's Avatar
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    Steve Williams
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    Addicted to Best! Lee's Avatar
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    Thank you Steve. My apologies for forgetting the search function.

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    Member Sponsor microstrip's Avatar
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    I have heard the Ref210s with KT120 and they sounded more powerful and dynamic than using the original 6550Cs. Our ARC dealer reports similar effects from the REF110.

    I still did not find any report of tube life of the KT120. ARC usually operates their 6550C tubes at 65 mA and quote a typical lifetime of 2000 hours in their manuals, although some people report a longer time. Surely it depends a lot on speakers and typical sound levels. Will the KT120 last longer?

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    Addicted to Best! Lee's Avatar
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    According to Dave Gordon, it is a more durable tube and he also mentioned some improved richness in the mids.

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    Site Founder And Administrator Steve Williams's Avatar
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    Which manufacturer makes the KT120 for ARC
    Steve Williams
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    Member Sponsor microstrip's Avatar
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    Quote Originally Posted by Steve Williams View Post
    Which manufacturer makes the KT120 for ARC
    AFAIK, the Tung Sol KT120 is manufactured at the New Sensor factory in St. Petersburg, and there are no other sources.

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    If ARC recommends the KT-120 for their amps, I wouldn't hesitate to try them. ARC has very high standards for the tubes they use and ARC is very conservative.

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    Site Founder And Administrator Steve Williams's Avatar
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    I was at the California Audio Show yesterday and one of the local dealers here in the SF Bay Area was running ARC's latest Reference amp the 250 which not only replaced the 210T but also the Ref610T as ARC feels that not only is the amp better than both of these but also is the best amp they have ever built. Also the dealer commented that the amp was made to run KT120's and in fact was being played at the show with these tubes
    Steve Williams
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