Oozing, sweating and melting like slimey animal over the circuitry. Here’s a closeup of wiring inside an old Binson Echorec delay unit. This problem seems to be unique only to Binson – goodness knows where the Italians got their wire from! Both the single conductor and coax wiring have this disease. The state of the wiring can be deceptive. It may look okay, even quite pristine, however after a little poking around I noticed brittle, dried insulation dropping away to reveal tarnished green copper beneath. This is one of the salts of copper, almost certainly copper chloride formed by the reaction between the copper conductor and the volatile gases emitted from the insulation over time. The wiring actually seemed to degrade further whilst I carefully worked to replace it. Just a bit of movement caused dust and insulation flakes to fall onto the circuitry or corroded wires to snap off. I had the feeling that an archeologist must have when breaking the air-tight seal on some archeological artifact such as the Mummy’s tomb. As soon as air enters the crypt the mummy would begin putrifying. Time was working against me as the wiring soon turned to dust.
If you purchase an Echorec with original wiring it will all need to be replaced – an incredibly time consuming, laborious and consequently very, very expensive job, that is, if you can find anyone with the skill and experience who’s willing to undertake the task. If purchasing an Echorec do make sure that this work has been done or ask the seller to reprice the unit accordingly.