CS Port Monaural Power Amplifier 212PA Power Amplifier
Large 3-electrode tube 212E mounted
This is a large triode with a plate loss of 275W in a transmitting tube and a modulating tube. A class-A single tube amplifier has a small output and is difficult to drive low-efficiency speakers, but this unit is a full-fledged amplifier that operates at a plate voltage of 1,400V and drives at a 40W output. It also suppresses the output to gain a damping factor of 5 or more and reliably drives the low frequencies as well.
* Western licensed STC4212E from the 1960s to the 70s and equipped with Nishikyushu photoelectron tube 212E
Two-step configuration with an ultra-high confidence tube C3g
Equipped with ultra-reliable pentode C3g developed by Deutsche Telekom for telephone repeaters. Since the grid line is thin and the distance between electrodes is large, voltage amplification with high linearity is possible. This unit is composed of only two amplifier tubes with 212E, which suppresses harmonic and mixed modulation distortion while providing no feedback.
High fidelity input transformer
In the two-stage amplification, the insufficient gain is produced by the input transformer. A high-linearity transformer using a high-permeability super-malloy core that passes through micro-signals without adding any extra material.
* Because the input impedance is as low as 1.5kΩ, drive with a device with an output impedance of 300 Ω or less.
Noise suppression at the contact point
Many contact points in the amplifier are the source of noise due to the rectifying action at the micro level. (The rectifying action of the metal oxide film is especially large.) The internal signal path is designed without using a connector to prevent noise generation, and the direct current flow section uses a gold-plated connector.
|METHOD||Input transformer Built-in class A Vacuum tube power amplifier|
|CONSTITUTION||Input trans – C3g 3 tube – FET driver – 212E tube – Output trans|
|OUTPUT||40w (Load impedance 4Ω · 8Ω)|
|TOTAL HARMONIC DISTORTION THD||1% typ/40W 1kHz 0.2% typ/10W 1kHz|
|S/N RATIO||90dB / 10W 8Ω|
|INPUT SENSITIVITY||1V / 40W|
|GAIN||25dB / 8Ω terminal|
|INPUT / IMPEDANCE||RCA 1line 1.5kΩ|
|VOLUME||By front volume|
|DUMPING FACTOR DF||Over 5|
|SPEAKER OUTPUT||4Ω / 8Ω terminal|
|POWER SUPPLY||AC100/120/200/240V 50,60Hz|
|SIZE||188W×385H×563D Knob,SP terminal not included|
|FINISH||Silver alumite and precious rosewood veneer|
|ACCESSORIES||Rhodium plated AC power cable|
|WARRANTY PERIOD||5 years (excluding consumables) registration is required|