| Guild Thunderbass/Quantum amp. Help with ID
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I know both of these amps are nearly identical aside from the 50W of output. I'm looking at one right now but I'm not sure if it's the thunderbass or quantum model. I have read about a small label or something on the front, but I have not been able to find a large enough photo of a quantum model to know.
Can someone who has owned one of these amps chime in? | 
