Simple 5 Watt SET with cathode feedback

Simple 5 Watt SET with cathode feedback. (About cathode feedback)
Simple 5 Watt SET with cathode feedback
Compleate schematic with power supply

The amplifier can run with output tubes like 6550, KT66, KT77, KT88, KT90, KT100, 6L6, 5881, EL34, etc.

19-JAN-08:
Simple 5 Watt SET with cathode feedback

12-MAR-08:
Simple 5 Watt SET with cathode feedback

Test results:

All results with KT88/65mA bias.

Max power output (onset of clipping):
5.3W (6.6Vrms @ 8.2 ohm)

Harmonic distortion, Vout=5Vrms:
400Hz: 2nd: 2.5% (-32dB), 3rd: ---% (---dB), 4th: 0.18% (-55dB)
30Hz: 2nd: 3.5% (-29dB), 3rd: 0.6% (-45dB), 4th: 0.2% (-53dB)

Distortion pattern 5Vrms, 400Hz:
Simple 5 Watt SET with cathode feedback

Bandwidth Vout=5Vrms:
18Hz-24kHz (+0/-1dB)
10Hz-35kHz (+0/-3dB)

Zout:
2.1 ohm

  • Output transformers by Novarria IT
  • Mains transformer and choke by Hammond CA
  • Tubes and other stuff from Demostenes NO, ELFA NO, Partsconnexion CA
  • Overall design by: Jan Erling Veiset.
    (c) Jan Erling Veiset, 10-JAN-2008 - E-mail: valhalla[at]mikke-mus.com
    Akersora 2
    N-6600 Sunndalsora
    Norway
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