Some kind of buffer/preamp for my SS guitar amp fx loop

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Hello everybody! 🙂 Sorry for my poor english... I wondering if someone could help me to find some kind of buffer/preamp tube device that I could connect to the FX Loop of my Line 6 vetta guitar amp to give some warm tube sound to the general sound.

Is there some kind of 12AX7 or 12AU7 circuit that I could use for this?

The fx loop with the buffer should works like this:

Digital/DSP/Preamp -> BUFFER -> Main power amp -> Speakers

Thank you so much

João
🙂
 
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