Reply To: Backplate without mid-frequency adjustment

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    Note that I am not at all qualified as an electrical engineer, so I apologize for lack of appropriate terminology.

    Note 2: It is rare to harm the electronics, but if something does ‘burn out’, it is most often the brilliance control, which is actually fairly inexpensive and not difficult to replace. And is so intentionally because it acts as much like a ‘fuse’ or early warning sign that you would easily notice and it prevents the likelihood of severely damaging the more expensive components (torroid) in the backplate. If the brilliance control does become damaged, your hi frequency will disappear, but turning the control fully clockwise can be a useful diagnosis because it will by-pass the control and hi frequency will be fully restored (with no attenuation)… Hope this helps.