Re: What's a transient?

On Wed, 26 Apr 2006 03:59:30 GMT, "west" <westley@xxxxxxxxxxxxxxx>
wrote:


"Ian Iveson" <IanIveson.home@xxxxxxxxxxxxxxxx> wrote in message
news:Q023g.13643$xt.6743@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
I read quite often here about things people call "transients".

What are they, please? What have they got to do with valves?

Thanks,

Ian

I believe that Ian knows what a voltage transient is. What he's probably
alluding to is transient response. That is the speed of the initial attack
of a sound, if you will. In one of my home brew amps, I noticed that the
transient response sounded diminished. I learned a valuable lesson from this
problem because it turned out to be too much HT filtering. Changing to a
smaller filter cap solved the problem. "Speed" was restored. I verified this
with the scope but Peter Frampton's "Frampton" lp proved it to my ears. His
solo guitar rendition in "Show Me the Way" makes great demand on an amp's
transient response. All this is, of course, is my opinion. I'm not sure of
all the correct terminology, but I know when those strings are humming. BTW:
Perhaps someone can explain how to determine the "sweet spot" in filtering
values. You can have too much as I learned.

Cordially,
west


No. Transient response is how well a system reproduces a transient -
not what the transient itself is like.

And of course the amount of HT filtering has no bearing on transient
response - provided of course you have enough. HT capacitors need to
be big enough to prevent hum breakthrough at maximum drive level.
Speed of response is a function of the circuit of the amplifier itself
- I'm afraid your statement here about speed being compromised by
excessive HT filtering is just plain wrong. It is quite possible, of
course that being a homebrew there was some other problem that
manifested itself when there was a lot of HT capacitance; feedback
round a transformer can be a problem.

d

--
Pearce Consulting
http://www.pearce.uk.com
.

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