The Millennium II can't be modified to have two tones like the Millennium and older metal cased Cointrax Barons have. The Millennium and older Cointrax Barons use the components on the base board for audio, the Mellinneum II and e-Class don't have base boards, all the components are on one board. The Millennium II's come standard with the 2.1 version chip and in the Standard Disc and Standard All Metal modes can be set to give a staccato response on targets from iron through zinc pennies, but it's a lot different from the low/high tones the Cointrax models with the base board have. Installing the 2.2 chip allows setting the volume and duration of the staccato audio, but a resistor has to be added to the board and Mr Bill is the only source for the chips, if he has any left. The SST uses a single board, but it has the components to allow either single tone, dual tones (low tone for iron and high tone for foil and up) and 9 tones, which is a different tone for every meter segment. Actually, it has 10 tones if the overload signal is counted. The SST gets excellent depth, but it's not as deep as the Cointrax models and the Cointrax chips won't work in it.
All of the Barons including the Cobra II, Viper, Newforce CS-5ZX and 4ZX can use the same coils, but the Millennium II and Newforce models have screw on coil cable connectors. The connectors can be changed, Merc changed them on my 5ZX so I could use the same coils on it and the three Barons I have. It required buying a panel mount female 5 pin DIN connector and two male 5 pin DIN connectors, but it only took him about 20 minutes to change them on the housing and two coils. I bought the connectors off amazon.com for about $15 including shipping.
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