hi, i have a pair of old mac 50-w2 mono blocks and one got sick tonight.

the first symptom was a rushing noise a few seconds after the amp was
turned on, much like being between channels with a old tube AM radio.

i powered it off and suspecting a tube swapped tubes with the working amp.

problem satyed with the same amp - so not likely a tube.

i then swapped outputs to the speakers - problem stayed with the amp -
so not the speaker.

when i put it all back together and tried again, one of the output
tubes flashed blue and the fuse blew.

when i've had similar problems in the past, it's been a bad tube,
but it doesn't look like that this time.

thoughts?
--
Lance