Preamp tube question

rubin
rubin Posts: 565
edited May 2009 in 2 Channel Audio
I'm using a Jolida envoy preamp which uses (2)12AX7's and (2)12AT7's.I've done some tube rolling and I'm wondering if I could remove the 12AX7's and use (4)Mullard12AT7's for a mellower sound.Would doing this damage the preamp.
Post edited by rubin on
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  • marvda1
    marvda1 Posts: 4,901
    edited May 2009
    contact jolida, i know in my jolida 502b which uses two 12at7 and two 12ax7 i can use four 12au7.
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  • haimoc
    haimoc Posts: 1,031
    edited May 2009
    I would contact Jolida for this question.
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  • F1nut
    F1nut Posts: 50,561
    edited May 2009
    Generally speaking that's not a good idea. If you want less gain use a 5751 in place of the 12AX7.
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  • rubin
    rubin Posts: 565
    edited May 2009
    Got the answer from Jolida...12AT7's in the 12AX7 sockets WILL!!! damage the preamp.
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  • zingo
    zingo Posts: 11,258
    edited May 2009
    Let's take that as a no then. :D
    Jake
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  • Systems
    Systems Posts: 14,873
    edited May 2009
    What F1 said about the 5751 tubes. You'll get a little less gain and get a better sound. You won't be driving your tubes as hard for a smoother sound. Conrad Johnson does this with some of the better amps they build. They use a 5751 instead of a 12AX7 to lower the gain and lessen the burden on the tubes. I may clock my volume knob a little higher on these amps but the music is much more enjoyable. Again, check with Jolida on the swap. Also check which 12AX7's you need to run. IIRC short plate 12AX7's are a better fit then the long plates. Or is it the other way around? Been a long time since I had mine out to play with them.
    Testing
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  • rubin
    rubin Posts: 565
    edited May 2009
    187CAM wrote: »
    What F1 said about the 5751 tubes. You'll get a little less gain and get a better sound. You won't be driving your tubes as hard for a smoother sound. Conrad Johnson does this with some of the better amps they build. They use a 5751 instead of a 12AX7 to lower the gain and lessen the burden on the tubes. I may clock my volume knob a little higher on these amps but the music is much more enjoyable. Again, check with Jolida on the swap. Also check which 12AX7's you need to run. IIRC short plate 12AX7's are a better fit then the long plates. Or is it the other way around? Been a long time since I had mine out to play with them.

    Thanks for the info.
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