Andy Evans wrote:

http://members.lycos.co.uk/fiultra/KISS%20100.htm

It will help you to fall off your chair laughing.

It's all a very inflated exercise in designing a circuit for which many
examples already exist. Andy

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

There are indeed plenty of 300B based SET amps to be found on the web.

Most don't use loops of global NFB.

Some will use a 6SN7 to boost a 0.4v signal to 4v with one triode of the
two,
and the second triode boosts the 4 volts to 40v which is applied to the
grid of the
300B, producing 5 watts, or about 160v x 31 mA at the anode which is
applied to an OPT which transforms the power to
5.5v x 0.91amps into 6 ohms connected to the secondary.

If the speakers are horns, which Andre says should be used with such amps,
then amplifier
distortions will never be a problem because the distortion reduces with
power output.
Horns can produce 100 dB SPL at 1 watt.
There is about 3% thd at 5 watts, ( 107 dB ) but at 87 dB the power needed
is only 50 milliwatts, where thd is below 0.3%, and mostly 2H.

But I know folks with 8 watt amps based around the 300B
and they use speakers of 90 dB/w/m efficiency and they still find the
sound
better than higher powered amplifiers they have tried.

Using tubes such as the 211, 845, 805, 833, etc will allow far more power
than
a lone 300B, and hence better fidelity at higher power output levels
with less sensitive speakers.
Most folks value the SET amp for the way it somwhat inexplicably provides a
better subjective
listening experience than many other types of amplifiers.
They simply don't care about measurements, if the
wine tastes well, they drink it.
Many find that the warm midrange, say with massed violins, sounds
closer to what one hears at a concert than when using other forms of amps.

On more than one occasion I wowed a group of 30 audiophiles in a club with
these amps...
http://www.turneraudio.com.au/htmlwe...22monobloc.htm

I proved you could have power, and NFB, and low thd, and get warmth and
great music.



Patrick Turner.