Alessandro Galavotti's
DHT Home Page
Take away NS to write me.
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Last Revised: Dec. 19th 2020 - ***
NOTE: Please Excuse for any
inconvenience: I'm recovering my old site that originally was hosted
on the long-defunct Geocities webspace
· COMING SOON
- "New Year's Amplifiers" of course all DHT ;)
WHAT'S NEW
- 19/012/2020 "TubeLittleTester2020"
- 20/07/2020 "Angelo 2020" a all DHT Tube Amplifier with filament bias
- 10/11/2019
A simple 3D printed Switchboard for DIY Tube Tracers
- 10/01/2017
"WOW!" A Hi-End Tube Amplifier... 12V Powered!
- 23/12/2017
"3D Printer and Tubes" Got a 3D Printer? you can make
plenty of useful parts for DIY Tube amplifiers!
- 16/12/2017
" Russian Love 1 &2" two simple DIY Tube Amplifiers based on 6c45P and 6P1P
- 11/11/2017
"NewAge" a simple DIY Tube Amplifier
line of tube amplifiers, with increasing performance - Nice thing can be powered by a 12V wall PS
In the amplifier Section
- 01/11/2017
"12V Switching Power Supplies for Tube Amplifiers"
- 10/20/2002
"Angelo" POWER SUPPLY
Finally I did
it !
- Sorry for the delay - In the Amplifer
section
A little worth-noticing
episode that took me
- 12/29/2001
"Angelo" a simple DIY Tube Amplifier
A simple but
very nice sounding two tube amplifier
In the Amplifer section.
- 9/22/2001
"Zero" a DIY Kusunoky style DAC based on TDA1541
The long-awaited DAC for all the CD-PRO
building comminty
In the DAC section.
- 8/25/2001
"Hedlunds & EX3"
My Story & some modifications - In the speaker section.
Want to see
the GANG??..herewe
are!!!
- 7/25/2001
DANIELE ANSALONI's Push
Pull Amplifier Using EC 8020 Tube
A very nice
design & dicussion rediscoverying
of one of the last european
high-performace tube.
Unfortunately Italian at
this moment. In the amplifiers
section.
- 6/23/2001
"TVC" a DIY Trasformer Volume Control
- The right
way to control sound level. In the miscellaneous section.
- 4/29/2001
"Minimo" a Kusunoki Style DAC for VAU
1252-10 CD Engine
This extremely
simple DAC is very suitable for
Philips Cd engine.
Project in the Misc. Section.
- 12/23/2000 Major improvements
in my amplifier
(Francesca 2000)
This new version
uses 572-3 tubes and the
ultimate hi-performance tube 6C45P.
Power supply
of the VAU1252 Cd engine.
Ironed a littlle
bug in the schematic (LM317 resistor's
position)
- 09/28/00 A High-End
DIY cd Player using Philips VAU1252-10 Cd Engine.
Now we can really
say that our audio chain is all DIY, from player to
speakers, cables included
;) Also the Links section has been updated
- 04/27/00 Amplifer Section: "MONOtriodino 3", a top class
SE amplifer with 2A3.
- 03/30/00 "Limes":
a Voight Pipe using Fostex's FE83.
- 03/015/00 Loudspeaker
section: a Simple& Cheap TQWT using Fostex FE164
- 01/30/00 Loudspeaker Section.
A simple High Voltage Variable
supply for electrostatic
Cells
- 01/04/00 Loudspeaker
Section. A simple
algorithm to solve the tractrix
formula
with a (downoladable) spreadsheet.
- 12/26/99 Schem. Section . Completed the second section of my DIY
tube tracer: How to identify
tube model's
parameters. Practice on the ECC82 tube with a (downoladable)
spreadsheet.
- 26/10/99 Miscellaneos section:
added a photo reportage of two ENORMUS HORNS
taken during
"top Audio" meeting held in Milan.
- 8/15/99 Schem. Section . Added the first chapter of my DIY tube tracer (Hardware)
- 4/15/99 Schem. Section. Added a photo of my DIY
plasma Tweeter
- 2/14/99
Schem. Section: Added a nice 211 SET cricuit
thank to Paul Preston
- 2/04/99 Francesca
1999: Recent improvements
on Francesca: now all
x-formers coupled
Schem. Section: Added a brief discussion on biasing Strategies
- 1/17/99
Links Section Added
Schem. Section - A project of my DHT dealy circuits.
Schem. Section: Added the "Side Vivace Photo gallery
"- Part 2
- 11/15/98 Schem. Section- The"Side
vivace" : . Added
a Detailed Photo
gallery of the DIY costruction of this Horn
- 10/9/98 Schem. Section- Added a new ECL82 based
driver for 572
Power Supply Section- Added pre-charge delay circuit & some building advices.
Schem. section
- A prototipe (as usual)
of my Electrostatic Loudspeakers.
- 8/17/98 Schem.
Section: EL34/6CA7 SE amplifier
- 8/6/98 Photo of "Fracesca"'s
prototipe addedd
- 8/3/98 Schem. Section: Volume
control added
- 7/23/98 Schem.
Section: IGBT Amplifier
Added
- 7/23/98 Schem.
Section: BJT Class A Amplifier
Added
- 7/22/98 Schem.
Section: Two new SV
572-10 circuit Added.
Now Playing ..
Work in prgress in my living room as to last publishing date:
· TV: OLED TV 55E6V
· DA Unit: DIY DAC TDA 1541 (will publish schematic)
· Power Amp: WOW! a SE all Xformer coupled Amplifier
· Speakers: Hedlunds (by Hornet ) powered by Lowther EX3 8 ohm
Once Playing (2002).
My first audio chain :
· CD Motor: CD Pro philips unit
· DA Unit: Kusunoky - style DAC with 1541
· Power Amp: "Angelo" (2a3+6c45P) (will be published soon)
· Speakers: Hedlunds (by Hornet ) powered with Lowther EX3 16S
· Signal cables: DIY silver-teflon Cables
.
PROJECT SECTION
AMPLIFIERS
12 Volt Tube Amplifers:
- Wow! a of two stage SE triode amplifiers ( 6C45 + SV572-3 ) 12V powered
- Russian Love 1& 2 a simple two stage SE triode amplifier (6c45P + 6P1P) 12V powered
- New Age a simple two stage SE triode amplifier (ECC88 + 6P1P) 12V powered
- 12V Tube amplifer SMPS considerations on commercial Switching Power Supplies useful for DIY tube amplifers and other critical parts
- Francesca 2000 the last release of my power amplifier (6c45P+2a3+572-3)
- Francesca 1999 the previuos release of my amplifier (EC97+2a3+572-10)
Other Hi-End Amplifiers:
- The power & warmth of DHT sound : Angelo 2020 (devoted to the 20th birthday of my son) (NEW)
- Simplicity is the best: Angelo PS (devoted to my newborn son)
- Simplicity is the best: Angelo a simple two stage amplifier (devoted to my newborn son)
- Our little jewel: "ll Monotriodino 3°"
a DHT amplifier using
2a3
- A high-slew rate high-bandwith IJBT Amplifier
- A simple (and old) Class A Mosfet Amplifier
- A EL34/6CA7
/ 2A3 A Class SE amplifier
- Paul Preston's 211 SET
DANIELE
ANSALONI'S EC8020 / 211 / 845 Amplifiers
- Forums: Discussions
MISCELLANEUS
3D Printing and Tubes:
- A 3D printed switch board for Tube Curve Tracer and my Tube tracer experience
- DIY 3D printed parts for rapid tube prototyping
Volume Controls:
- TVC a Trasformer Volume Control
- A high-precision, low-noise stepped resitor volume control
DACs & CD Players:
Theory & all the rest:
- The Biggest Horn
I've ever seen at Top Audio
- A DIY tube Tracer
- A high-Class DHT Delay Circuit
- A little discussion on Biasing strategies
- A simple Arduino based TubeTester:TubeLittleTester2020... (NEW)
LOUDSPEAKERS
Horns
- My recent experience
with Hedlunds & Ex3
- An algorithm to solve the Tractrix Formula
- The "Side
Vivace" part one a Lowther
based Horn. Details of costruction.
- The "Side
Vivace" part two. the
end of the story...
TQWTs
Electrostatic & Plasma
- My Electrostatic Loudspeakers (a prototipe).
- A simple Variable
HV generator for
electrostatic cells
- A prototipe of my Plasma/
Flame Tweeter
.
LINKS SECTION
- My Favourite LINKS
... just a starting point
to the best DIY of the web.
Images from the past...
Francesca 1999 & my ESL
WARNING.... NON AUDIO STUFF BELOW .....
Ever heard of friendship??? well, here's the Gang... We've been friends since school age and we all have a dream .....
About me:
- me and my ex-girlfriend on holyday .... (now
she's my wife)...;) photo1
I've not much to say... Although I'm an engineer.... and after I've discoverd
tubes I don't spend a lot on caluculus... the only way is to listen... ;)
That's all Folks!!!
.... for the moment
Alessandro.