Today I have an old Rotel 820BX3 that sounds good for an hour after
which I get tired of it (and consequently doesn't listen very
much...). After reading on the net I got the impression that both the
Sugden and 300B amps are less "tireing" to listen to. I have small two
way speakers (Quad 77-10L - 84db) and I understand that the 300B likes
more easy driven speakers than this. But I normally listens on low
volume (9 o'clock) so I am hoping that the 300B will be usable for me
anyway.
I don't have the possibility to listen to any of the amps so I am
hoping to get some comments from someone who has.

Ronny

In article , Ronny
Svensson wrote:
Today I have an old Rotel 820BX3 that sounds good for an hour after
which I get tired of it (and consequently doesn't listen very much...).
After reading on the net I got the impression that both the Sugden and
300B amps are less "tireing" to listen to. I have small two way speakers
(Quad 77-10L - 84db) and I understand that the 300B likes more easy
driven speakers than this.

But I normally listens on low volume (9 o'clock) so I am hoping that the
300B will be usable for me anyway. I don't have the possibility to
listen to any of the amps so I am hoping to get some comments from
someone who has.

I'd make two points:

1) There may well be all kinds of designs that use 300B valves. The results
probably depend a great deal upon the design details, choice of components,
etc. Hence comments on one design may not tell you what you'd need to know
about another.

2) If you are considering low feedback and/or bandlimited designs, and/or
ones where transformer saturation may be an issue, then comments from
someone else who may have a different taste, different room, and different
speakers, may also not tell you what you'd need to know. The output
impedance, etc, of the amp would interact with the chosen speakers to get
results that will vary from one system to another. This isn't just a
question of sensitivity or rated load impedance.

I would therefore recommend that you be cautious of using any comments by
others as abasis for spending your money in this area unless you *can*
listen first.

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html

In article ,
Ronny Svensson wrote:
After reading on the net I got the impression that both the
Sugden and 300B amps are less "tireing" to listen to. I have small two
way speakers (Quad 77-10L - 84db) and I understand that the 300B likes
more easy driven speakers than this.

Class A designs shouldn't be much worried by load, since they dissipate
their maximum current when quiescent.

Sugden certainly work fine with the Quad ELS, although slightly lacking in
power.

--
*I used to have an open mind but my brains kept falling out *

Dave Plowman London SW 12
RIP Acorn

www.stereophile.com did a review on the Sugden last fall. It is supposed
to be a real bargain. I really like my Jolida 102B(30wpc), but it is
AB. Look at the 301s at
www.responseaudio.com. They can be bought upgraded with the best parts.

Ronny Svensson wrote:

Today I have an old Rotel 820BX3 that sounds good for an hour after
which I get tired of it (and consequently doesn't listen very
much...). After reading on the net I got the impression that both the
Sugden and 300B amps are less "tireing" to listen to. I have small two
way speakers (Quad 77-10L - 84db) and I understand that the 300B likes
more easy driven speakers than this. But I normally listens on low
volume (9 o'clock) so I am hoping that the 300B will be usable for me
anyway.
I don't have the possibility to listen to any of the amps so I am
hoping to get some comments from someone who has.

Ronny

"Ronny Svensson" wrote in message
om...
Today I have an old Rotel 820BX3 that sounds good for an hour after
which I get tired of it (and consequently doesn't listen very
much...). After reading on the net I got the impression that both the
Sugden and 300B amps are less "tireing" to listen to. I have small two
way speakers (Quad 77-10L - 84db) and I understand that the 300B likes
more easy driven speakers than this. But I normally listens on low
volume (9 o'clock) so I am hoping that the 300B will be usable for me
anyway.
I don't have the possibility to listen to any of the amps so I am
hoping to get some comments from someone who has.

Ronny

An interesting and very inexpensive choice could be the Gainclone, because
the component count is so small you can alter some of them easily and you do
get a different sound.

I made mine with Polyester input caps and later changed them to
Electrolytics, the result was a slightly slower and more rounded sound. I
was frankly, astonished, I'd read that this happens but until I tried I
scoffed at the idea. I prefer the Electro caps. I've never changed the
resistors though, I used 10% carbon film bog standard ones, but I'm told
that changing these to 2% metal film ones changes the sound again, and that
these give a more 'solid state' sound, whereas the carbon ones are more
'valve' like.

Heres a couple of links to start you off,

Gainclone, the forum.
http://ampchipdiy.com/phpBB2/viewforum.php?f=2

Gainclone, my experience.
http://www.jrbham.btinternet.co.uk/tqwp/gainclone.html

My regards to you and good luck, if you decide to have a go.

J

"Ronny Svensson" wrote in message
om...
Today I have an old Rotel 820BX3 that sounds good for an hour after
which I get tired of it (and consequently doesn't listen very
much...). After reading on the net I got the impression that both the
Sugden and 300B amps are less "tireing" to listen to. I have small two
way speakers (Quad 77-10L - 84db) and I understand that the 300B likes
more easy driven speakers than this. But I normally listens on low
volume (9 o'clock) so I am hoping that the 300B will be usable for me
anyway.
I don't have the possibility to listen to any of the amps so I am
hoping to get some comments from someone who has.

Ronny

An interesting and very inexpensive choice could be the Gainclone, because
the component count is so small you can alter some of them easily and you do
get a different sound.

I made mine with Polyester input caps and later changed them to
Electrolytics, the result was a slightly slower and more rounded sound. I
was frankly, astonished, I'd read that this happens but until I tried I
scoffed at the idea. I prefer the Electro caps. I've never changed the
resistors though, I used 10% carbon film bog standard ones, but I'm told
that changing these to 2% metal film ones changes the sound again, and that
these give a more 'solid state' sound, whereas the carbon ones are more
'valve' like.

Heres a couple of links to start you off,

Gainclone, the forum.
http://ampchipdiy.com/phpBB2/viewforum.php?f=2

Gainclone, my experience.
http://www.jrbham.btinternet.co.uk/tqwp/gainclone.html

My regards to you and good luck, if you decide to have a go.

J

"Jim Lesurf" wrote in message
...
In article , Ronny
Svensson wrote:
Today I have an old Rotel 820BX3 that sounds good for an hour after
which I get tired of it (and consequently doesn't listen very much...).
After reading on the net I got the impression that both the Sugden and
300B amps are less "tireing" to listen to. I have small two way speakers
(Quad 77-10L - 84db) and I understand that the 300B likes more easy
driven speakers than this.

But I normally listens on low volume (9 o'clock) so I am hoping that the
300B will be usable for me anyway. I don't have the possibility to
listen to any of the amps so I am hoping to get some comments from
someone who has.

I'd make two points:

1) There may well be all kinds of designs that use 300B valves. The
results
probably depend a great deal upon the design details, choice of
components,
etc. Hence comments on one design may not tell you what you'd need to know
about another.

2) If you are considering low feedback and/or bandlimited designs, and/or
ones where transformer saturation may be an issue, then comments from
someone else who may have a different taste, different room, and different
speakers, may also not tell you what you'd need to know. The output
impedance, etc, of the amp would interact with the chosen speakers to get
results that will vary from one system to another. This isn't just a
question of sensitivity or rated load impedance.

I would therefore recommend that you be cautious of using any comments by
others as abasis for spending your money in this area unless you *can*
listen first.

**Perfectly and succinctly put, Jim. Excellent advice.


--
Trevor Wilson
www.rageaudio.com.au

"Dave Plowman" wrote in message
...
In article ,
Ronny Svensson wrote:
After reading on the net I got the impression that both the
Sugden and 300B amps are less "tireing" to listen to. I have small two
way speakers (Quad 77-10L - 84db) and I understand that the 300B likes
more easy driven speakers than this.

Class A designs shouldn't be much worried by load,

**Incorrect.

since they dissipate
their maximum current when quiescent.

**Correct.


Sugden certainly work fine with the Quad ELS, although slightly lacking in
power.

**Doesn't it depend on which model Sugden?


--
Trevor Wilson
www.rageaudio.com.au