I am trying to determine if it is worth buying a new sound head for an old Dynatron 150. The instrument seems fine however the frequency and watts controls will not change the frequency or watts settings. They do however seem to be active as they initiate some of the software functions suggested when they are pushed and held during power up. A biomed tech suggested to me that there are issues with these controls and it may mean the machine requires board replacement. What I am hoping is the case is that these particular controls do not work without a soundhead being plugged. I can find no references in the manual and so far have not heard back from the manufacturer on this.
Has anyone direct experience with this or an instrument that they can try what I am doing without a soundhead to see if the settings can be adjusted?