I don’t really know what a Groove Tube is. But for musician, they sure know about it. The new groove tubes gte34ls at musician’s friend is origin from Slovakia. It is used for a better tone by adding 15% more power and it is able to prolong the life cycle. How to install it? I have no idea. I think need to ask the expert on this, or maybe try to Google, for sure you can find something out of it.

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