Progress update
After several days testing the mechanics of the Nagra, which included a fresh/blank tape loading (both reels), playing mode and FFWD/RWD random iterations, it all looks that the machine is at reasonable good health.
I started to try some personal copies I made of some tapes to check the audio playing directly to the Eros - not that great - it looks I have not arrived to safe port yet.
I will try an extensive cleaning of heads and transport pins and play again a master tape (I still have the modified Technics to compare), But I'm afraid it might need a professional calibration and/or a head inspection/re-haul.
After several days testing the mechanics of the Nagra, which included a fresh/blank tape loading (both reels), playing mode and FFWD/RWD random iterations, it all looks that the machine is at reasonable good health.
I started to try some personal copies I made of some tapes to check the audio playing directly to the Eros - not that great - it looks I have not arrived to safe port yet.
I will try an extensive cleaning of heads and transport pins and play again a master tape (I still have the modified Technics to compare), But I'm afraid it might need a professional calibration and/or a head inspection/re-haul.