from another forum anyone any idea whats broke ?
 

Hi,

"Keith G" wrote in message
...

Interesting. (What's a 'feedback destroyer' when it's at home?)

It's designed to be used for getting rid of stage feedback, but
they can be used as a multi-band parametric equaliser (8
bands I think) in a 'home' system to tune the EQ. Favoured
by subwoofer builders, apparently.

Regards,

Glenn.

from another forum anyone any idea whats broke ?
 

"Glenn Booth" wrote in message
...
Hi,

"Keith G" wrote in message
...

Interesting. (What's a 'feedback destroyer' when it's at home?)

It's designed to be used for getting rid of stage feedback, but
they can be used as a multi-band parametric equaliser (8
bands I think) in a 'home' system to tune the EQ. Favoured
by subwoofer builders, apparently.




OK, I think I wuz in a conversation with Serge about one of these a few days
ago!

from another forum anyone any idea whats broke ?
 

"Keith G" wrote in message

"Arny Krueger" wrote in message
. ..
"Don Pearce" wrote in message

On Fri, 5 May 2006 11:05:33 +0100, "Keith G"
wrote:


"Don Pearce" wrote in message
...
On Thu, 4 May 2006 15:10:23 +0100, "Serge Auckland"
wrote:

(Can't believe I said that!! ;-)

Your ULPP valve amps should be close enough to a SS
amp to show you the difference between your triodes
and a SS amp. This is because the main attributes of
the SE triodes is a high output impedance causing
frequency response anomalies and high harmonic
distortion, especially in the bass. With your horns'
high efficiency, output power isn't an issue. By
changing to an ULPP amp with feedback, you will be
reducing the output impedance and
harmonic distortion possibly by a factor of 10.
Changing to a SS amp, you could reduce output
impedance and distortion by a further factor of 10,
but this won't be as noticeable as the first lot of
reductions. If you prefer the sound with the ULPP
amp, (and I did when I heard it) that will indicate
the direction I think you should be going.

S.


The big difference, which Keith has already identified
with his Argos Special amp last week, is that the
cleaner drive will make the whole thing sound a good
deal less loud than it sounds with all that SE
distortion present. With speakers of limited drive
capability, this may or may not be a problem.


I can't see how higher distortion figures can cause a
10 (?) watt SET to sound much louder (bigger) at say
1/4-1/3 volume than a 30 (?) watt SS amp at 3/4
volume...???



True though. Play a clean and a distorted piece at
precisely the same sound pressure level, and the
distorted one will sound much louder and fuller. I found
this out for myself big time when I got my Stax
electrostatic headphones. At first I was disappointed
that they wouldn't go very loud, then I took them off
and realised they were bellowing.

Yes, this is well-known. Clean, smooth, balanced sound
at a given SPL generally sounds quieter and less dynamic
than distorted, unbalanced, rough sound.

...and which smells of cabbage..??

Hmm. The rough, distorted one. Only people who just lately fell off a cabage
truck from the farm would put up with it.

o)

????

from another forum anyone any idea whats broke ?
 

"Keith G" wrote in message

"Arny Krueger" wrote in message
...
"Keith G" wrote in message

"Don Pearce" wrote in message
...
On Thu, 4 May 2006 15:10:23 +0100, "Serge Auckland"
wrote:

(Can't believe I said that!! ;-)

Your ULPP valve amps should be close enough to a SS
amp to show you the difference between your triodes and a
SS amp. This is because the main attributes of the SE
triodes is a high output impedance causing frequency
response anomalies and high harmonic distortion,
especially in the bass. With your horns' high
efficiency, output power isn't an issue. By changing
to an ULPP amp with feedback, you will be reducing the
output impedance and harmonic distortion possibly by
a factor of 10. Changing to a SS amp, you could
reduce output impedance and distortion by a further factor of 10, but
this won't be as noticeable as the first lot of
reductions. If you prefer the sound with the ULPP amp,
(and I did when I heard it) that will indicate
the direction I think you should be going.

S.


The big difference, which Keith has already identified
with his Argos Special amp last week, is that the
cleaner drive will make the whole thing sound a good
deal less loud than it sounds with all that SE
distortion present. With speakers of limited drive
capability, this may or may not be a problem.


I can't see how higher distortion figures can cause a 10
(?) watt SET to sound much louder (bigger) at say
1/4-1/3 volume than a 30 (?) watt SS amp at 3/4
volume...???

Distorted sound is usually perceived as sounding louder
than clean sound. SETs can also cause frequency response contouring that
can favor the ranges where the ear is most sensitive,
causing a given amount of power to sound louder.

Finally, SETs often have poorer power supply regulation,
which means that the can put out more power for short
periods of time. Finally, there seems to be this regrettably tendency for
SET fanciers to judge SS based on rather poor quality SS
amps.


Arny, mi dear chap - all this palavering!

(I know what you're up to, but it ain't working! If you
want a cheap SET you are going to have to get one from
eBay - you can't have one of mine!! ;-)

Go see my sleek new *minimalist* setup - here's the
'digital sector':
http://www.apah69.dsl.pipex.com/show/digitalbitz.JPG

and here's the 'analogue sector':

http://www.apah69.dsl.pipex.com/show/analoguebitz.JPG


Nice, innit? :-)

Seems like you've managed to collect the worst of both.

from another forum anyone any idea whats broke ?
 

"Arny Krueger" wrote in message
...
"Keith G" wrote in message

"Arny Krueger" wrote in message
...
"Keith G" wrote in message

"Don Pearce" wrote in message
...
On Thu, 4 May 2006 15:10:23 +0100, "Serge Auckland"
wrote:

(Can't believe I said that!! ;-)

Your ULPP valve amps should be close enough to a SS
amp to show you the difference between your triodes and a
SS amp. This is because the main attributes of the SE
triodes is a high output impedance causing frequency
response anomalies and high harmonic distortion,
especially in the bass. With your horns' high
efficiency, output power isn't an issue. By changing
to an ULPP amp with feedback, you will be reducing the
output impedance and harmonic distortion possibly by
a factor of 10. Changing to a SS amp, you could
reduce output impedance and distortion by a further factor of 10, but
this won't be as noticeable as the first lot of
reductions. If you prefer the sound with the ULPP amp,
(and I did when I heard it) that will indicate
the direction I think you should be going.

S.


The big difference, which Keith has already identified
with his Argos Special amp last week, is that the
cleaner drive will make the whole thing sound a good
deal less loud than it sounds with all that SE
distortion present. With speakers of limited drive
capability, this may or may not be a problem.


I can't see how higher distortion figures can cause a 10
(?) watt SET to sound much louder (bigger) at say
1/4-1/3 volume than a 30 (?) watt SS amp at 3/4
volume...???

Distorted sound is usually perceived as sounding louder
than clean sound. SETs can also cause frequency response contouring that
can favor the ranges where the ear is most sensitive,
causing a given amount of power to sound louder.

Finally, SETs often have poorer power supply regulation,
which means that the can put out more power for short
periods of time. Finally, there seems to be this regrettably tendency
for
SET fanciers to judge SS based on rather poor quality SS
amps.


Arny, mi dear chap - all this palavering!

(I know what you're up to, but it ain't working! If you
want a cheap SET you are going to have to get one from
eBay - you can't have one of mine!! ;-)

Go see my sleek new *minimalist* setup - here's the
'digital sector':
http://www.apah69.dsl.pipex.com/show/digitalbitz.JPG

and here's the 'analogue sector':

http://www.apah69.dsl.pipex.com/show/analoguebitz.JPG


Nice, innit? :-)

Seems like you've managed to collect the worst of both.




I think I'll plead the fifth......

;-)