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In Reply to: RE: Lower gain (than 5751) direct replacement for 12AX7 tubes ? posted by Old SteveA on June 19, 2015 at 11:16:52
A 12AU7 may give you lower gain, but it requires wildly different operating conditions that the X7 and may give you quite a bit more distortion, if it works at all. The 12AT7 may work, but probably will have similar issues as the U7. The best tube would be the 12AY7. It characteristics are similar, and will give lower gain.
Dan Santoni
Follow Ups:
Thanks, I think I'll have to give the 12AY7 a try !(It was pointed out to myself that I've mistakenly referred to this as a
"direct" replacement; Oops!!!)I'll let you know if this was a good alternative !! (If it doesn't work
it's not a big deal; I can live with the 5751s,but I have a "feeling"
the 12AY7s will work as I've been on a "streak" of things that have worked
for me lately ! where did I put my 4 leaf clover ,rabbit foot, lucky horseshoe... etc.)
Edits: 06/19/15
Circuits are designed for the tube that they come with.If the replacement tube has lower gain then it's not a direct replacement.
Changing to a different tube without re-designing for the new tube is just asking for trouble.
I will never understand why people do this.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 06/19/15
Isn't that more or less what I said. However sometimes it does work.
When it comes to tubes people swap because they can.
Dan Santoni
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