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    Too much gain......??

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    BillyB

    Posts : 3
    Join date : 2012-02-06

    Too much gain......??

    Post by BillyB on Mon Feb 06, 2012 10:37 pm

    Hey....I am new to tubes so bear with me.

    I am running an SS pre into one of Bob's ST-70's with EL-34's. My speakers are JBL 4311's which are pretty agressive.

    Although I like what I am hearing.....The music sounds very alive but at times the sound sounds harsh and over driven. I am wondering if I have to much gain between my pre and the dynaco.

    My pre puts out 50 db from the phonostage for MM than I have a step up for MC which bumps it up another 23 db for MC.

    I also have the high gain board. Now the last thing I want to point out is that the pre does have an attenuated output for driving more effecient amplifiers.....which I am using so maybe its not a gain issue?????

    When I get a tube pre from Roy I am going to have the low gain board installed....




    Bob Latino
    Admin

    Posts : 2411
    Join date : 2008-11-26
    Location : Massachusetts

    Re: Too much gain......??

    Post by Bob Latino on Mon Feb 06, 2012 10:46 pm

    Those JBL's are 91 dB efficient which is fairly average efficiency. Your combination of 50 dB on the phono stage and then 23 MC step up is too much gain into the amp. Why don't you try eliminating the MC step up and see how it sounds. Unless you have a real low output MC cartridge, it may work OK without the MC step up. I use right now a higher gain MC cartridge into a MM phono input and the gain at least for my combo seems fine ..

    Bob

    BillyB

    Posts : 3
    Join date : 2012-02-06

    Re: Too much gain......??

    Post by BillyB on Mon Feb 06, 2012 10:55 pm

    Bob Latino wrote:Those JBL's are 91 dB efficient which is fairly average efficiency. Your combination of 50 dB on the phono stage and then 23 MC step up is too much gain into the amp. Why don't you try eliminating the MC step up and see how it sounds. Unless you have a real low output MC cartridge, it may work OK without the MC step up. I use right now a higher gain MC cartridge into a MM phono input and the gain at least for my combo seems fine ..

    Bob

    Ok...Thanks Bob....I will try that.

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