• An 845 single end amplifier
  using LL1620/90mA, LL1671/50mA and LL1667/5mA.

• Hybrid power supply using both diodes and tube rectifiers to get the best of the two worlds. We think this is excellent as it works very well with our mains transformers.
• Hi-End Transformer-Coupled Tube Headphone Amplifier With Digital Input
  using LL1630 line output transformer.
• DAC 2.0 with the D/A Converter N°3 board by ARMONIA Hi-Fi and Lundahl LL1636 transformers
• Singel-end headphone amplifier
  using our LL1630 line output transformer
• Same as above, but with LL1689AM transformer for improved performance ^NEW
  using our LL1630 line output transformer (March 09)
• SETA Single ended cathode follower vacuum tube amplifier
  using LL1627/140mA, LL1660/10mA and Lundahl mains and chokes.
• 300B PSE - Parallel Single Ended Amplifier "The Reference"
  using LL1627/140mA, LL1660/10mA and Lundahl mains and chokes
• 300B PSE - Parallel Single Ended Amplifier with fixed bias implementation,
  using LL1627/140mA, LL1660/10mA and Lundahl mains and chokes
• 300B SE - Single Ended Amplifier "The Little Reference",
  using LL1623/90mA and LL1660/10mA
• SV572-3 Single Ended Amplifier
  using LL1620/90mA, LL1660/25mA and Lundahl mains and chokes.
• KT88 push-pull amplifier
  using LL1623 OPT
• 2A3 PSE - Parallel Single Ended "The New Reference Amplifier",
  using the LL1627/120mA, LL1660/10mA and Lundahl mains and chokes
• Hi-End Push-Pull Amplifier "- 20W no feedback!",
  using LL1623/PP, LL1660/10mA and Lundahl mains and chokes
• A 300BXLS Single Ended Amplifier using the KR Electronics tube KR300BXLS
  with LL1623/120mA, LL1667/5mA and Lundahl mains and chokes
• Single ended tube amplifier for Stax electrostatic headphones
  with LL1660/25mA
• Simple transformer driver for STAX electrostatic headphones
  using LL1630/PP.
• 6BX7-based Single Ended Single Stage (SESS) amplifier for STAX electrostatic headphones
  using LL1660/10mA, LL1667/5mA and Lundahl mains and chokes
• reference 2A3 amplifier - 2W
  with LL7903, LL1660/10mA, LL1667/5mA, LL1623/60mA and Lundahl mains and chokes
• reference 4300B amplifier - 5W
  with LL1667/5mA, LL1623/60mA and Lundahl mains and chokes
• Ultra Fast High Power Single Ended Amplifier
  with LL1627/185mA and Lundahl mains and chokes
• 300BXLS Single Ended Amplifier
  with LL1623/120mA and Lundahl mains and chokes (Aug. 2004)
• EL34 Parallel Single Ended
  with LL1627/185mA and Lundahl mains and chokes (Aug. 2004)
• A Power Follower project
  very short signal path and LL1660 transformer (June 07).
• A new 845 Single End Amplifier
  using LL1620/90mA, LL1671/20mA and LL1638/8H (June 07).
• A DAC project
  with LL7903 transformer (June 07).
• The "Final" DAC version,
  using LL1660AM/10mA amorphous core transformers (Aug. 08).
• A "No compromise" Phono Preamplifier, ^NEW
  using LL1931 and LL1660AM/10mA transformers and LL1668 chokes (March 09).
• Tube output transformer selection list. This excel sheet is a guide to find the appropriate Lundahl output transformers to a certain tube.
  This is an excel file, but it does not contain any macros. We are really not friends of distributing excel files from web sites as 1) there is a virus risk and 2) it requires that the receiver can read excel file formats. Any suggestion on how to publish materials like this is greatly welcome.

Who is Andrea Ciuffoli

Andrea Ciuffoli is a software engineer, working with Internet technologies.
He is involved in the Audio Hi End DIY since 10 years ago. His aim in is to search
for new solutions, to try new ideas and to look for any improvement.
He is not involved with any financial business in the field, the Andrea's wish is
to improve and share his know-how both in the Electroacoustics and in Electronics.
Being a Spice expert most of his conceptual work is CAD oriented, such an
expertise, put together with an excellent ability in crafting 'fast' his devices,
gives him the possibility to cover all the aspects of the hobby.

(by Francesco Pintavalle)