MATRIXSYNTH: Rare Lexicon Prime Time 93 Digital Delay

Tuesday, June 13, 2023

Rare Lexicon Prime Time 93 Digital Delay

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You might notice this delay has a VCO. More on that further below. "Rare Lexicon Prime Time 93 digital delay with maxed out memory, in fully functioning and perfect working condition. The front panel is immaculate. It is likely one of the cleanest Lexicon 93's in the world."

This one was sent to: "Dane Beamish of Beamish Electronics for repair, who is well known in the industry as the main tech who works on Lexicon gear. He wasn't cheap, but he went over it in great detail, and replaced all of the tantalum and electrolytic caps, a new timing crystal, several op-amps, and installed 24 new RAM chips. He also fully calibrated it. He recommended paying additional for the more expensive higher quality Texas Instrument RAM chips since (in his experience) they rarely go bad, so I decided to go with his recommendation, despite the much higher cost. He told me it was the cleanest Lexicon Prime Time 93 he had ever seen. He believes it may have left the factory this way, and sat on a shelf as a test unit, or may have left the the factory by other means. You can read his write up in the attached invoice."

Regarding the VCO, via

"Lastly, there seems to be some confusion online about the Prime Time 93’s VCO. I heard it referred to as an LFO in one video and that didn’t sound right to me. I contacted Gary Hall, creator of the Lexicon PCM42 digital delay, who worked for Lexicon at the time the Prime Time 93 was in production. Here’s what Gary had to say:

'Actually, the Prime Time has both an LFO and a VCO. Internally, the digital circuits are all run by a clock at ultrasonic rates. In the fixed delay mode, the clock is a crystal oscillator. When you click the knob to ‘UnCal’, the clock is taken over by a Voltage-Controlled Oscillator running at similar high speed which you can change with the manual sweep or with the LFO. The clock oscillator itself is a true VCO, however it’s not in audible range (I don’t have numbers in front of me, but it’s dog-whistle territory). It’s also linear-response only. No effort was made to have it conform to synth specs. So, VCO modulated by LFO and/or manual offset.'"

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