Spectra control heads

[Andy2712]

Are the spectra control heads interchangable at all?

[Will]

The A5 and A7 heads are interchangeable.
Some version Spectra radios will let you change the control head in the RSS to A4 rotary, A5, A7, or A9, AKA 9000 series.

If the Spectra is a HHCH A3 then you can not do any change due to the firmware/MLM.

To further address you question we need the Model number and control head type.