A. Galavotti's Homepage DIY Hi-Fi

Alessandro Galavotti's
DHT Home Page

Take away NMSPM to write me.

Last Revised: Oct. 20th 2002 - ***
NOTE: My site is partially hosted in space.tin.it server. This host is frequently overloaded. I apologize for all the inconvenicnces you'll find in this location.

COMING SOON

"DIY TUBE TRACER" Some improvements to SW & HW

WHAT'S NEW

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...

My audio chain as to last publishing date:

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

Francesca developement:

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)

Francesca: a intermediate version of "Francesca 999"

Francy: A low Cost Version of "Francesca".

The Roots of Francy:

A project to drive a 572 with a SRPP
A project to drive a 572 with a EL34
A project to drive a 572 with a ECL82

Other Hi-End Amplifiers:

Simplicity is the best: Angelo PS a simple two stage amplifier (devoted to my newborn son) (NEW)
Simplicity is the best: Angelo a simple two stage amplifier (devoted to my newborn son) (NEW)
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 SE amplifier
Paul Preston's 211 SET

DANIELE ANSALONI'S EC8020 PP Amplifier

A Great Discussion on EC8020 propierties: EC8020 the real hi-end tube?
The PP Main Article : PP EC8020
The Schematic: PP EC8020 schema

MISCELLANEUS

Volume Controls:

TVC a Trasformer Volume Control
A high-precision, low-noise stepped resitor volume control

DACs & CD Players:

ZERO a Zero Oversampling - Zero Digital Filtering DAC for VAU Engine using TDA1541(NEW)
MINIMO a Zero Oversampling - Zero Digital Filtering DAC for VAU Engine using TDA1543
A DIY CD player using philips VAU 1252-10 CD engine

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

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

The Limes a cool Voight pipe using FE83..
A simple TQWT using FE164

Electrostatic & Plasma

My Electrostatic Loudspeakers (a prototipe).
A simple Variable HV generator for electrostatic cells
A prototipe of my 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

me (standing) with my best friend (Andrea, on the left) during a party photo2
me with Fabio in my countryhouse photo3
me very young (eighteen?) ... at Versailles (Paris) .... you can see time flies.. photo4

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.