PL83 (6BQ5 equivalent) Single-ended Ultra-Linear Stereo Power Amplifier
This
amplifier was featured on the February 2004 Issue of the "High-Fidelity Audio:
Radio Technology" by Mr. Tadaatsu Atarashi. The intention
for this amplifier was to drive classic high-efficiency speaker systems, such as
Western Electric WE-594A or WE-755A. Although the basic circuit of this
amplifier is rather simple, Mr. Atarashi used high-voltage 30A Schotky Barrier
Diodes on the full-wave rectifier with the anode grounding configuration.
Mr. Atarashi believes anode grounding rectifiers would yield more detailed and
sharper sound images. Besides the uniqueness of the power supply system,
Mr. Atarashi used Hashimoto S30A80H power transformer, C-60-50W choke coil, and
H-507S output transformers for this projects.
Mr. Atarashi tested this amplifier on his B&W SS25 and Western Electric
WE-594A. As the results, Mr. Atarashi was impressed with the rich
orchestra sound from this mini amplifier. After his article was published,
Mr. Atarashi utilized this amplifier for another article,
"10 Output Transformers Sound Comparison
on 300B / 6BQ5 Single-Ended Amplifiers" from the "Tube Kingdom" 2004
Spring issue Vol32.
