spamtrap1888 wrote in message
...
On Jun 19, 1:14 am, "N_Cook" wrote:
spamtrap1888 wrote in message

...
On Jun 18, 8:03 am, "N_Cook" wrote: Hearing it again
I would say its more open looped amp motorboating. Cant
analyse for frequency etc until tomorrow. Needless to say have not been
able
to induce any noise like this.

Further info from the owner
" It's whenever there isn't a signal that the buzz persists. I first
noticed
it when i stopped playing in the middle if a song and i heard this
murmur"

140K MP3 , 5 second file, is (theoretically ) now on/off this host

sitehttp://www.diverse.4mg.com/ampbuzz.htm



(minimal htm page to get round "forbidden" remote linking stuff )

Your search - buzz site:www.diverse.4mg.com/amp- did not match any
documents.

+++++
I've added an underscore version there of
bothhttp://www.diverse.4mg.com/amp_buzz.htm

maybe an oscillogram there later today

Just sounds like something's ungrounded, like when you plug a 1/4 in.
phone plug into a jack, before the ground connection is made.

+++

When I've a bit of time , will add a few more sound snippets to be able to
direct owners to
Any more to add to list of , simulated or actual , faults ?
"static" excessive amp hiss noise
howl-round / squeel
simple mains hum
mains buzz from failure of bridge rectifer
clipped signal
one polarity only of push-pull output
"motorboating" of open-looped amplifier
compression/ lack of compression