OR-0033
Salo Oy
Salo, Finland · 1991 – c. 2004
Ser. HF-9922-0261
1999 · effect
Issued as VST3 · AU
Restored 2025 from 1999 hardware.
Salo 6310 — Speakerphone
Salo 6310 · half-duplex hands-free unit · restored from unit no. HF-9922-0261 · Salo Oy, Salo, Finland, 1999
The restorer's note
The exact texture of a 90s conference call — the pumping echo-canceller, and the way whoever spoke quieter simply got clipped out. That switching is not something we missed; it is the half-duplex design, and it is the whole character.
Acquisition
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The plate
Listening
Listening
Demonstration recordings, prepared at the bench.
The floor, held
Dry for six seconds; then the box takes over at bench settings — band-limited and boxy, the far-end feed ducking the near voice as the unit decides who may speak.
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One voice at a time
Duplex walks from full — both parties audible — to hard half-duplex, one voice at a time; Switch then slows from 5 to 200 milliseconds and the handover becomes a pump.
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The box itself
Room at 90 % and Band down to 2.5 kHz — the enclosure at its worst. Echo Cancel steps to full at ten seconds, scrubbing the reflection and pumping as it works, then falls away again.
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