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Hi there,
has anyone a suggestion for a reliable tuner for modding to support MPX Output?
…except the Tivoli Audio one…
Cheers Tom
The Tivoli is my best recommendation, because of its excellent performance. I have a few friends who have modded other tuners, only to find out they didn’t have flat low frequency response, which is an absolute must.
It’s worth trying, though. If you have an oscilloscope and a known good exciter (BW PLL+ 1w) you can play squarewave on the air and probe the MPX output pin on the tuner IC inside the unit. You can find out which pin from googling the IC model number to find the data sheet. If you probe it and see only a very small amount of tilt, and no curvature, that’s a promising result. Then, just add a buffer amplifier with a high impedance input and low impedance output — a composite video opamp would be ideal.
Mod monitor tuners have MPX tuners too, and they’re usually excellent, but a completely different price range.
///Leif
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