Can tinnitus be measured with EEG or MEG? Can tinnitus be measured with EEG or MEG (magnetoencephalography)?
Is it visible in a power spectrum?
In an ERP/ERF?
Michelle Heijblom's (2009) master thesis on Visualising tinnitus with fMRI and EEG mentions the following:


  Different studies report that tinnitus is characterised by an increase
  in slow-wave activity (0.5- 4Hz: delta activity) and a decrease in
  alpha activity (8-12 Hz) at temporal regions. Recently it has been
  suggested that this loss of alpha power is related to an increase in
  gamma power. [Weisz 2005, Weisz 2007, Lorenz 2009, Ashton 2007,
  Wienbruch 2006]. Weisz et al. state that the alpha decrease and delta
  increase resemble the state during slow wave sleep. This supports the
  idea that the changes in spontaneous brain activity might be mediated
  by sensory deprivation (hearing loss).