Francesca
1999 - a 572-10 DHT Amplifier
Francesca 1999 is
the previuos version of my DHT amplifier.
This was another
intermediate result to get a "no compromise version" of Francesca.
Majors differences
(vs. Francy) are:
-
Coupling trasformers
are used in each stage.
-
In the input stage a
paralleled couple of EC97 tubes
Te use of copling trasformers
has definitely improved the clearness of the sound and the resolution of
little details in music. (now in choirs you can easily distinguish voices,
or ear the decay of the sound in the recording room) .
The use of Ec97
has improved a lot the gain (EC97 's mu is 63 compared ti 44 of 5842)
while the lowering of the Ra has improved the drive of 2a3. The EC97 is
a low cost choice but with very nice sound, expecially in the high part
of the spectrum.
Here is the main
schematic.
POWER
SUPPLY
In this
page there are all the detail to build the power supply and some advices
to "do it right".
FRANCESCA
99 's PROTOTIPE
Here's a photo of
the amplifier, still under costruction.
That's all folks,
Listen and ENJOY!
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