There ya go. I always thought aggie made the 18v circuit. When did haz start making them? do they still use aggi as well?
I should have been a little clearer on the voltages, I was refering to just the voltage to the pickups not the working voltage of the pre. Just from experience playing around over the years with emg's.
Good to always get it straight from the man!
The USA 18v circuit has always been made by HazLabs. Stuart started including dual humbuckers and the 18v USA Circuit during the SSD days back in the early 1990's. That's why the original NS-5 models (Kramer) had dual J pups and the USA 9v circuit... it wasn't until after Kramer's demise that Stuart started building NS-2 (called the NS-4 during the SSD days) and the NS-5 with other options such as seen here: [Invalid or Expired Link Removed]
Note that there are three pup configurations and two circuit options for the NS-4. The NS-5 has three circuit configurations...
The last one (with 5 knobs) being the Piezo bridge with the 18v circuit.
Since 1979 the ONLY circuits used in SPECTOR Neck-Thru USA Series basses have been the HazLab-made 9v and 18v circuits made specifically for SPECTOR. Not that other circuits haven't been installed at the request of the person ordering the bass. Rex Brown orders his USA SPECTORs with the TonePump in them... Mike Kroeger wants NO active circuit in his basses... etc...
Aguilar's OBP line of preamps can all be wired for 9v or 18v... but to my knowledge SPECTOR has never wired them for anything but 9v. Again, there may be one or two special orders where the purchaser requested something different... so when I speak I mean in general as per the price-list stock options.

