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    Yet Another Output Tube Thread!

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    kevinmi

    Posts : 77
    Join date : 2009-11-17

    Yet Another Output Tube Thread!

    Post by kevinmi on Sat Mar 31, 2018 3:55 pm

    Here's the story- after building my ST-120 amp several years back, I started tube rolling. I tried Sovtec KT88's, 6550's, and a quad of Gold Lion Kt88's. I wasn't impressed with the GL's, and then the Tung-Sol KT 120's came on the market. I purchased them and was pleased with the sound.
    After at least 5 years without tube rolling, I decided to put the GL's back in to make sure they still worked before I put them up for sale. Lo and Behold, I am actually liking the way they sound, even more that the KT-120's. I don't know what it is that made me not like them in the first place. They are a lot smoother than the KT 120's. Maybe warmer, not so analytical, so to speak.
    I think that ageing them in my basement for several years made them better, you know, like a good wine. Now I'm gonna have to start tube rolling all over again to see if the other tubes sound better!

    nmchiefsfan

    Posts : 46
    Join date : 2012-03-21

    Re: Yet Another Output Tube Thread!

    Post by nmchiefsfan on Sat Mar 31, 2018 6:33 pm

    Maybe your KT120's are just wearing out and it is time for a new set!
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    kevinmi

    Posts : 77
    Join date : 2009-11-17

    Re: Yet Another Output Tube Thread!

    Post by kevinmi on Sun Apr 01, 2018 8:31 am

    nmchiefsfan wrote:Maybe your KT120's are just wearing out and it is time for a new set!
    Yeah, I thought about that also. I'll check them out on my tube tester if I can figure out how to set it up for those tubes correctly. Probably try KT-88 settings to see how close they match.

    nmchiefsfan

    Posts : 46
    Join date : 2012-03-21

    Re: Yet Another Output Tube Thread!

    Post by nmchiefsfan on Sun Apr 01, 2018 11:22 am

    I have been running my KT-120s for 5 years. I should put my sovtec KT-88's that came with the amp in and see if I hear a difference!
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    Roy

    Posts : 178
    Join date : 2018-01-14
    Location : Netherlands, Europe

    Re: Yet Another Output Tube Thread!

    Post by Roy on Sun Apr 01, 2018 12:09 pm

    after 5 years of use those kt120's will definately differ from a fresh set of kt88's Wink
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    deepee99

    Posts : 1993
    Join date : 2012-05-23
    Location : Wallace, Idaho

    Re: Yet Another Output Tube Thread!

    Post by deepee99 on Wed Apr 04, 2018 9:23 pm

    Five years or about 3k hours is a lot to expect of even the best new-issue tubes.
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    sKiZo

    Posts : 1486
    Join date : 2013-04-01
    Location : Michigan USA

    Re: Yet Another Output Tube Thread!

    Post by sKiZo on Thu Apr 05, 2018 1:21 pm

    Ah - thanx for the reminder. Been meaning to switch back to the KT120's here. Been using the TAD 88STRs for a while now. Time to give them a rest.

    As far as whether they'll sound the same as before? Who knows? Not used to them anymore, and I AM running a completely different set of drivers ...
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    peterh

    Posts : 967
    Join date : 2012-12-25
    Location : gothenburg, sweden

    Re: Yet Another Output Tube Thread!

    Post by peterh on Thu Apr 05, 2018 3:38 pm

    deepee99 wrote:Five years or about 3k hours is a lot to expect of even the best new-issue tubes.

    My 6550 has 3783h and keep ticking .... Same quad as installed app. 3 years ago

    ( used in a vta-70, JJ )
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    kevinmi

    Posts : 77
    Join date : 2009-11-17

    Re: Yet Another Output Tube Thread!

    Post by kevinmi on Sun Apr 08, 2018 7:46 am

    kevinmi wrote:
    nmchiefsfan wrote:Maybe your KT120's are just wearing out and it is time for a new set!
    Yeah, I thought about that also. I'll check them out on my tube tester if I can figure out how to set it up for those tubes correctly. Probably try KT-88 settings to see how close they match.
    I tested the KT-120's and they all tested around 7450 to 7500, which is new for a KT-88 on my Hickok 533a tester.

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