There is an old saying that goes, "if you want to build an amplifier build an oscillator and if you want to build an oscillator build an amplifier".
The strange thing about this amplifier is that although it sounds terrific, like a tape recorder running at 10x 30ips, the waveform of a sinewave at the scope looks terrible and completely unclear.
It is still a sinewave but the line is 20x thicker. This indicates radio frequency oscillation.
The line stops being thick when the CD player is stopped.
It also happened connecting to the CD player's headphone out.
It still happens if the anode to grid resistor is disconnected from the anode and connected to Vb.
The amplifier sounds terrific as if a real orchestra is performing with the most high frequency yet smooth and easy to the ear overtones.
Could it be that a very high frequency exists and performs a similar function to the ultra sonic bias frequency that tape recorders use?
No comments:
Post a Comment