Re: Philips N4450 Reel to Reel Tape Player
Track 1 or the left track in a quarter track machine notoriously loses the treble after significant head wear. Often it's just because dirt congregates in the "corner" of the wear ridge. Cleaning is difficult as the cotton bud often rides right over the dirt, missing it completely. The dirt needs to be very carefully removed without damaging the head. If this is the case, having removed the dirt, you'll just have to keep removing it periodically.
With serious audio work, the head would never have been be allowed to get to that state as both recording and playback become unreliable.
Also, as record heads wear, they tend to become overbiased, which robs the recordings of treble. I've lost count of the recorders I've rebiased to restore the highs in record.
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