I just bypassed the Tandy cassette cable with jumpers for a quick test. I found this on ebay: https://www.ebay.ie/itm/Amstrad-CPC-6128-Dragon-32-64-IBM-5150-High-Quality-Cassette-Tape-Leads-Cable-/250903444573
Jesus R ----- What do you mean by "bypass" or "bypass cable"? There is at least one guy making and selling new standard cassette cables. (sold as ibm 5150 cassette cables, but it's the same for Model 1, 100, and coco) Do you mean an audio transformer?