The Bluegrass 550 from Invaders Amplification (invadersamplification.com) is a 100% tube amp single-channel tube amp that has a pretty phenomenal sound. One thing is sure, you won't run out of headroom with this amp!
![](https://theguitarchannel.biz/wp-content/uploads/2017/10/Invaders-logo-2020-black-1024x362.jpg)
Invaders Bluegrass 550 review
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Free Extract:
Until the next gear review or interview, keep on playing the guitar!
Pierre Journel.
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