- Monaural Power Amplifier
212PAM2
- Non-feedback monaural power amplifier with large triode 212E. Driven by a plate voltage of 1400V and 40W output power, it embodies the clear sound that CS Port pursues.
- Large triode 212E
- High fidelity transformer
- Doubly regulated power supply
Features
- Large triode 212E
- The 212E was developed by Western Electric in the 1910s as a transmitter and modulator tube. Unlike the transmitter tubes developed later, the 212E is a vacuum tube with good linearity suitable for audio applications that operates with a negative bias. The 212E is driven by a plate voltage of 1400V and 40W output power. The output is suppressed to obtain a damping factor of 5 or higher, and low frequencies are also driven reliably. 《 There are two models: the 4212E manufactured by STC under license from Western Electric in the 1960s~70s, and the 212E manufactured by Jinzhou Electronics. 》
- Two-stage with C3g
- Equipped with the ultra-reliable C3g, developed by Deutsche Telekom. The thin grid lines and large distance between electrodes enable high linearity amplification. Using only two tubes of amplification with the 212E, harmonics and mixed-modulation distortions are suppressed though non-feedback.
- High fidelity transformer
- The input transformer makes up for the lack of gain in the two-stage amplification. It is received by a high linearity transformer with a high permeability super permalloy core and does not add anything extra. The core material, wire material, winding thickness, and winding ratio are carefully designed and manufactured to affect performance such as distortion, S/N ratio, and input/output impedance. * Please drive with a equipment with an output impedance of 300 Ω or less.
- Doubly regulated power supply
- Rectifiers used in general power supplies and contacts are noise sources. These are sharp-rising noises that span from 50 Hz to several hundred MHz and muddy the sound. To solve this problem, a switching power supply has been optimized for audio applications based on our half-century of knowledge in power supply development. The high voltage of 1,400V supplied to the 212E is doubly regulated by the switching power supply and analog power supply, enabling quiet output with no distortion.
Specification
Model 212PAM2-ST / 212PAM2-JH
Type Class-A Vacuum tube monaural power amplifier
Output Power 40 W (4 Ω, 8 Ω)
Frequency Response 20-40k Hz -3 dB/20 W
THD 1%/40 W 1k Hz 0.2%/10 W 1k Hz
NFB None
Signal to Noise Ratio 90 dB/10 W (8 Ω)
Input Sensitivity 1 V/40 W
Gain 25 dB (8 Ω)
Input Terminal Balanced x1 Unbalanced x1
Input Impedance 1.5k Ω
Volume Adjustment None
Dumping Factor 5 or more
Power Supply AC100/120/200/240 V, 50/60 Hz
Power Consumption 400 W
Dimensions 188W×370H×563D mm
Weight 24.5 kg
Finishing Anodised aluminium, Rosewood plates
Accessories AC cords
Warranty Period 5 years
○ The input impedance of this unit is 1.5k Ω. Please use a equipment with an output impedance of 300 Ω or less.
○ Two models are available: STC 4212E (model: 212PAM2-ST) and Jinzhou Electronics 212E (model: 212PAM2-JH).
○ The 4212E manufactured by STC is a rare item, so please contact us for availability.
○ Do not touch the vacuum tube as it is hot and may cause burns.
○ Vacuum tubes are treated as consumables and are not covered by warranty.
○ Dimensions do not include legs, knobs, or terminals.
○ The descriptions are current as of January 2025.
○ The appearance and specifications are subject to change without notice.
○ Actual colors may differ from those in the photographs due to shooting, lighting, etc.
