Hello,
I'm a newbie about reel to reel machines and I have bought an Otari 5050 first version, now perfectly calibrated, to play old 4 track prerecorded tapes ( and obviously 2 tracks... ). Actually it's only one curiosity, but I would like to know the characteristics of the two playback heads ( output tension and impedance ) to evaluate if I can modify one tube phono I have build time ago. I have read about Nab and IEC eq. and it's not a big problem to substitute my old RIAA, I don't know if a step up transformer is a good choice for these playback heads. Many thanks to all