04-Feb-2007.
Larasus, transformer coupled 842VHD PPP monoblocks:

One of two monoblocks:

Transformer coupled push pull amplifier based on KR-Audio's 842VHD direct heated triodes and EL84 driver stage.

Schematic:

• 40W rms in class A
• 60W in class AB1 and some more power when forced into class AB2.
• Frequency response: <10Hz-50kHz (-3.5dB), 20Hz -20kHz (+/-0.2dB) 40W Po.
• Distortion at 40W: 0.12% 2HD, 0.12% 3HD
• Distortion at 55W: 0.3% 2HD, 0.3% 3HD.
• Output impedance: 2 ohm, DF: 4

Distortion pattern at 55W rms:

Tubes and stuff from www.demostenes.no
Transformers from www.sowter.co.uk
Chassis work by www.mapletreeaudio.com
Overall design by Jan Erling Veiset - E-mail: valhalla[at]mikke-mus.com

Prosjektet har fått en Loggbok som beskriver byggingen og noen tanker bak (Norsk tekst)

15-FEB-2007, all lined up: