STAX SR507 headphones with stax SRM-T1S tube driver. The system is good working condition without issues. I am not the original owner. The driver is labeled as 100V, according to the previous owner it was converted to 120v internally. I have been using it as 120V. The unit has light scratches on the driver unit. The inner knob of the left and right balance has a slight play, but does not impact sound at all and balance still functions. I believe a set screw that holds the knob may need to be tightened.
The unit sounds really good, I recently upgraded to the 009. I do not have the original boxes , but I have access to lots of packing materials at work so it will be well packed.
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