Thanks Richard for mentioning the later designs. I realized my omission when, after hitting the send button, I turned around and there was my Otari MTR-15 sitting there. Cheers! Corey On 2/8/2016 10:06 AM, Richard L. Hess wrote: > Hi, Corey, > > Ah yes, the Firesign Theatre tape that appeared to have been made with > part two overwriting part one (but going in the other direction, I > think). It was two track stereo. I suspected that this was the reason > and I realize it was used to reduce erase noise. If the erase head had > not been disabled, they would have lost one half hour segment instead > of two--although there was a tantalizing hint to what be there, we > could not find even a sliver to recover without the other program. > > Later designs with higher erase frequencies and especially lower > waveform distortion did not need to do this. There was no longer a > benefit. > > Cheers, > > Richard > > > > On 2/8/2016 12:39 AM, Corey Bailey wrote: >> Other "out of the box" thinking at the time led to disabling the erase >> head for first-pass on virgin tape to help the signal-to-noise ratio. >> This was accomplished by switching the erase voltage to a dummy head so >> that the load remained the same on the erase amp. Even tried this with >> 2" multitrack recording with improved S/N results but then, the mixer >> du-jour would forget to turn on the erase head when needed and record >> sound-on-sound for a punch-in so, the multitrack innovation was >> abandoned.