I recently was asked to record unfinished guitar to a track that Steve Albini recorded. So, I calibrated my tape machine using the tones that Electrical Audio provided on the reel.I record to 2 16 track almost every session. But I have only been using tape since 2004. And unfortunately in that time,...

Thanks. And yes I use the IEC circuit and IEC MRL calibration tape. We have a cheat sheet for NAB/IEC conversion.