12AT7 12AY7 12AU7 preamp tubes in single rectifier

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bylans1

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I'm looking for more information on using 12AT7 12AY7 12AU7 preamp tubes in my single rectifier - solo 50 - series 2. From what I can tell it's ok to use these tubes except for the v3 position. My goal is to get a little less gain and more adjustability range out of the volume knobs. With 12AX7's the vol knob is sssssssoooo touchy, going from 1/4 to 1/3 volume is just an insane amount of volume difference. Will I damamge or hurt my mesa head by using these tubes? - thanks guys
 
a 12AT7 in the v5 position made the volume knob a lot less touchy on my triple rec.....might be what you are looking for.
 
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