Stax electrostatic helmet and amplifier

For sale
SR-007 Stax helmet, STAX feature cable extension and Stax SRM-007 TII amplifier.
Good functional and general condition of both devices, the helmet was repaired on an earpiece a few years ago (welding recovery) but remains perfectly functional and kept in its specific case box at all times. The amplifier is in very good general condition.
An audiophile product, the headset is a rare model (sr 007 mkI), prized by connoisseurs of the Brand STAX , first contact by email so real interest, possibility of testing to confirm the condition and quality of the set.