The SR-009 was purchased new from TSAV a few years back and I have been the only owner; it's been stored on a headphone stand with a dust cover for the entirety of my ownership of it.

Cosmetically I'm confident to say it's at least a 9.5/10, I'm also including a STAX Headphone Plug Cap, alongside all original paperwork packaging and wooden box.

The Mjolnir 007tA has

"received all of the usual mods, been converted to use 6S4A tubes and fitted with a CCS to drive the new tubes. What this mod does is to take a pretty under performing and underwhelming amp and turn it into a mini KGST with much more usable power and usable voltage swing. The 007t and 007tA (and the new 700t) have a few issues but the major ones are the tubes used (which are only rated up to 330V but asked to run at 700V) and the resistors used as current sources for them. This means a lot of power is being wasted as heat, the amp can’t really handle the wild impedance swings of the headphones and the higher you push the volume, the more compressed the sound becomes. These mods fix all of that and transform the performance of the unit."

Regarding the sound, I can still confidently say there isn't another Tube Driver unit at or around this price point that sounds as good as this. I also have the original SRM-007tA Box to ship it in.

$3450 price is for both shipped via and insured via Fed-Ex or UPS within the US 48 only. If you live anywhere else I'll need to calculate shipping manually, given the weight of the amplifier unit.

Price for each unit alone is as follows:

STAX SR-009 $1950 - shipped within the US only
Mjolnir SRM-007tA $1700 + shipping

Additional pics can be provided as needed, and upon purchase items will be shipped within 3 business days