If you have a problem that's so extreme where you would actually consider doing what you're talking about, I say just fix the problem and be done with it. There's almost no chance that you'll be happy with the result. Tubes don't always fix problems like people think they do.
The most I would do, in your case, is to try an actual tube buffer, because that's what you're asking for. Musical Fidelity makes them. If a product like that doesn't work, you need to try something else.
The most I would do, in your case, is to try an actual tube buffer, because that's what you're asking for. Musical Fidelity makes them. If a product like that doesn't work, you need to try something else.