I cannot switch off a Jadis Defy 7. Help

The power switch may be activating a "relay" which is then the actual power controller ??? My arc vt100 had the same issue & I cleaned the contacts on the relay (not sealed)& amp went back to behaving normally when power switch used. Cleaned with "DeOxit"

Don't pull your cord because the discharge may blow your woofers.I did this by mistake once and t sounded like an M-80 went off in my room.

It should be ok to 'pull the plug'--If you power-off the pre first.Wait a minute or so before unplugging the amp.BTW I have had this problem with 3 different amps. (MR ref.2,Eagle4,CJ 8)I had a Defy 7 for 4 years and never had the problem with 'it'.--Switches go bad. It's just hard to find someone to do the work locally, as some are a complicated 'switch-exchange'.

you can get a new switch from Northstar Leading the Way