On Sun, 31 Aug 2014 17:01:45 +1000, Trevor Wilson
wrote:


**Oh yeah, the model number of the amp might assist.

SA EH750 FWIW. Don't much like it anyway - too modern.
Having slept on it, I'll make up another 'scope test lead from
screened coax; the current bodge just uses speaker twin core which
could itself be causing the feedback.