I see you also have a 2000-II preamp. They’re a good unit but likely in need of some upgrading.
@George S. has documented quite a few really worthwhile upgrades, including op-amp and capacitor replacements, ground improvements and power supply changes that will give your old preamp a cost-effective sonic upgrade.
Good luck and ask questions if you’re ever in doubt.
Hi e30m3mon;
This preamp was purchased off eBay around 2003, in good physical and working condition, along with some similar weaknesses, as described in these threads:
DChristie's PL 2000
PL2000 Series 2
Cory's Phase Linear 2000 Ser II
No more 60 Hz hum in a PL2000 preamp
Over the years, various modification to address the weaknesses are accomplished, some a different path chosen, however, works for me.
Remove AC line and transformer
Make External unregulated DC power supply
Install Onboard +/- 15v regulators
Replace filter/coupling caps
Purchase RC4136 Upgrade Adapter, LM4562MA chips and install
Agreed, many worthwhile upgrades/comments are posted on this forum site, and enjoy viewing/learning from them.
Sincerely;
MB