Thursday, September 29, 2016


Here are two Space Echoes open on the bench. The scope is looking at the bias oscillator signal being modulated by an input signal in the record-amp stage of the unit on the left. This RE-201 was not echoing. The unit on the right is my own mostly working one, open for some A/Bing of various test points. Cleaning of heads, head alignment, new tape and increased bias voltage brought back the echo on the unit on the left. It now feeds-back nicely on all head selections with the intensity pot set above 12 o'clock.

While I was there, an intermittent reverb fault was tracked to the power supply of the unit on the right (the reverb drive amp and panel peak indicator light are driven from an 11V rail not used by the rest of the machine).