I bought a Spector used a few weeks ago. I love it. I was told it was a European NS5. I'm trying to figure out what kind of electronics it has .... are they (a) USA EMG BT 9v preamp circuit; (b) Aguilar OBP-1 18v preamp circuit with voltage doubler; or (c) Spector TonePump 9v circuit? Who can help?