"Andy Evans" wrote in message


As a matter of interest, Arny, which of these describes you?
a) I spend most of my time helping people
b) I divide my time between helpig people and mocking people
c) I spend most of my time mocking people

(a), with a bullet!

However, some of the ways one helps people may involve using some humor.

I would be more inclined to find out what the variac is doing to the amplifier
and fix that. Not to experiment

I don't have measurement equipment unfortunately, apart from my usual DVM. what
is the actual construction of a variac? I had imagined it was an isolation
toroid with a large series of taps off the secondary. Andy

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

On 19 Oct 2004 16:58:30 GMT, ohawker (Andy
Evans) wrote:

I would be more inclined to find out what the variac is doing to the amplifier
and fix that. Not to experiment

I don't have measurement equipment unfortunately, apart from my usual DVM. what
is the actual construction of a variac? I had imagined it was an isolation
toroid with a large series of taps off the secondary. Andy


Pretty much - except there is no secondary. It is a big tapped choke
rather than a transformer. The turns ratio still applies to get the
output voltage, though. Picture the way a volume control works, and
substitute an inductor for the resistor and you have it.

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

Pretty much - except there is no secondary. It is a big tapped choke
rather than a transformer. The turns ratio still applies to get the
output voltage, though. Picture the way a volume control works, and
substitute an inductor for the resistor and you have it.

Thanks, Don. Two questions:
- Is this how a transformer volume control works - is it a variac or an
isolation transformer?
- How come my variac goes up to 270v - the analogy is the famous volume control
that goes up to 11!

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

On Tue, 19 Oct 2004 12:14:21 -0400, "Arny Krueger"
wrote:

"Andy Evans" wrote in message


As a matter of interest, Arny, which of these describes you?
a) I spend most of my time helping people
b) I divide my time between helpig people and mocking people
c) I spend most of my time mocking people

(a), with a bullet!

In my all too long experience of your posts, not so. Your website is
extremely useful to those with more than three braincells to rub
together, but your posts are definitely (c). And done with no
perceptible wit or humour.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On Tue, 19 Oct 2004 17:36:56 GMT, (Don Pearce)
wrote:

On 19 Oct 2004 16:58:30 GMT, ohawker (Andy
Evans) wrote:

I would be more inclined to find out what the variac is doing to the amplifier
and fix that. Not to experiment

I don't have measurement equipment unfortunately, apart from my usual DVM. what
is the actual construction of a variac? I had imagined it was an isolation
toroid with a large series of taps off the secondary. Andy


Pretty much - except there is no secondary. It is a big tapped choke
rather than a transformer. The turns ratio still applies to get the
output voltage, though. Picture the way a volume control works, and
substitute an inductor for the resistor and you have it.

You beat me to it! But you have to imagine an olde worlde wirewound
volume control. :-)
--

Stewart Pinkerton | Music is Art - Audio is Engineering

You beat me to it! But you have to imagine an olde worlde wirewound
volume control. :-)(SP)

Hello Stewart. My pal Chris (ex Bill Beard, as was the variac) is of the
opinion that the benefit of the variac is lowering the impedence, which in turn
should clean up some of the treble hash. Does this figure?

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

In article ,
Andy Evans wrote:
My pal Chris (ex Bill Beard, as was the variac) is of the opinion that
the benefit of the variac is lowering the impedence, which in turn
should clean up some of the treble hash. Does this figure?

No

--
*Remember, no-one is listening until you fart.*

Dave Plowman London SW
To e-mail, change noise into sound.

On 19 Oct 2004 23:42:16 GMT, ohawker (Andy
Evans) wrote:

You beat me to it! But you have to imagine an olde worlde wirewound
volume control. :-)(SP)

Hello Stewart. My pal Chris (ex Bill Beard, as was the variac) is of the
opinion that the benefit of the variac is lowering the impedence, which in turn
should clean up some of the treble hash. Does this figure?

No. We aren't dealing with the audio signal here, but AC mains - which
doesn't have any treble (and any it might have, you want to get rid
of, not help along its way).

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

On 19 Oct 2004 20:26:17 GMT, ohawker (Andy
Evans) wrote:

Pretty much - except there is no secondary. It is a big tapped choke
rather than a transformer. The turns ratio still applies to get the
output voltage, though. Picture the way a volume control works, and
substitute an inductor for the resistor and you have it.

Thanks, Don. Two questions:
- Is this how a transformer volume control works - is it a variac or an
isolation transformer?
- How come my variac goes up to 270v - the analogy is the famous volume control
that goes up to 11!


11 and as far as you like. I should have realised the analogy only
went so far - like the volume control. With the inductive variac you
can continue the coil up past the point where you make your mains
connection, and the voltage will carry on rising all the way up.

As for a transformer volume control - I'm not sure what that is.

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