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    tung sol KT120

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    baddog1946

    Posts : 304
    Join date : 2010-02-03
    Location : Costa Rica

    tung sol KT120

    Post by baddog1946 on Mon May 17, 2010 5:56 pm

    Hi Bob:
    Sending this a second time as I think I screwed it up this morning.
    What is the latest on the KT 120 tubes. Are they still in your amp? I would appreciate your feedback now they are burned in a little.
    I am considering a back up quad for my ST120 and since they are a bit pricey I wondered what your thoughts were before I but a set.
    The long life factor appeals to me but I don't want to screw the pooch on the great sound I'm getting out of my broken in Gold Lion KT88's.
    Are they as good sonically?. Also have you and/or Roy had any more thoughts about an amp for these hi powers tubes?

    Bob Latino
    Admin

    Posts : 2413
    Join date : 2008-11-26
    Location : Massachusetts

    Re: tung sol KT120

    Post by Bob Latino on Mon May 17, 2010 7:17 pm

    Hi,

    The Tung-Sol KT120 tubes are still in my ST-120 amp and are still playing well @ 75 milliamps bias current per tube. As I have mentioned before - they sound a little smoother or "tubier" than the Genalex Gold Lion KT88's that they replaced.

    The KT120 tubes can be used in SOME KT88 based amps like the ST-120 without incident but you won't get the most out of these tubes unless you get the B+ up to the 650 to 720 VDC range and run at least 100 milliamps through each tube. These tubes are CAPABLE of 120-150 watts from a PAIR of tubes but you would have to design a new circuit around these tubes - AND - this new circuit wouldn't be able to use any other output tubes. You would be locked into these tubes AND what if they don't sell well and Tung-Sol decides to stop making them? You would be stuck with a circuit with obsolete tubes.

    Bob

    baddog1946

    Posts : 304
    Join date : 2010-02-03
    Location : Costa Rica

    Re: tung sol KT120

    Post by baddog1946 on Mon May 17, 2010 9:28 pm

    Good points Bob!
    As usual you have pointed out what I needed to know most succinctly. thank you. If I find some money I don't need I still might try a quad just to satisfy my audio habit but your point is well taken, thanks.
    Baddog1946

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