Denon PMA-830 Class A / B amplifier in excellent condition... REDUCED !

Description: For sale a vintage DENON PMA-830 amplifier in excellent condition. Amplifier works properly, no issues. The Bias and DC offset were adjusted by specs. Description: The Denon PMA-830 is an Integrated Amplifier which adopted the symmetrical push-pull scheme. The PMA-830 also adopts the symmetrical push-pull circuit adopted for the whole stage for the first time in the PMA-850. And in order to make the most of the characteristics of this circuit, the power amplifier part newly adds a class A operation DC amplifier to the class B operation DC amplifier configuration, realizing low distortion characteristics over an ultra-wideband. . A newly developed ultra-low noise transistor is used in the first stage of the symmetrical class A push-pull circuit of the equalizer amplifier, reducing the noise level to -142dBV (0.079μV) in terms of input, which is close to the limit. I'm here. Moreover, the gain of the equalizer amplifier is increased to 42dB (1kHz, 126 times), and even when the output of the equalizer amplifier is directly connected to the power amplifier, it is sufficiently driven. The direct couple system is adopted and when a control function is not required, it can switch to a simpler circuitry. A symmetrical Class-A push-pull circuit is adopted as the equalizer amplifier in the middle amplifier part which plays the role of a tone amplifier and a flat amplifier, and the low distortion is realized over a wide band. Moreover, the tone control has a structure in which a control element separates at the Defeat position, and a flat characteristic is obtained. A super-sized toroidal transformer that emphasizes S/N and voltage regulation is adopted as the power supply unit, and a powerful power supply unit is formed in combination with the parallel use of large-capacity block capacitors. In particular, as a countermeasure against leakage flux, which is an adverse effect of high S/N, strict multi-shielding is applied to suppress the leakage flux of the power transformer. The Subsonic Filter is carried. Continuously variable type volume is adopted as volume control. By adopting a special curve for the balance volume, it is possible to finely adjust the volume balance between the left and right channels. Specifications: Power amplifier part: Circuit method --Whole page pure complementary push-pull system DC circuitry Rated output (both channel drive) : Class A operation: 15W+15W (8Ω, 20Hz-20kHz, THD 0.005%) Class B operation: 65W+65W (8Ω, 20Hz-20kHz, THD 0.01%) 　　　　　　　　 90W+90W (4Ω, 1kHz, THD 0.02%) Total harmonic distortion - Class A operation: 0.005% or less Class B operation: 0.01% or less Intermodulation distortion (60Hz:7kHz=4:1) - 0.01% or less (at rated output equivalent amplitude output) 0.01% or less (at sine wave 1W equivalent amplitude output) Output bandwidth (IHF, THD 0.05%) Class B operation - 5Hz to 80kHz Class A operation: 5Hz to 100kHz Transmission characteristics (at 1W output) - DC to 100kHz +0 -1dB Input sensitivity/impedance - 1V/50kΩ Output impedance - 0.16Ω or less SNR - 122dB Output terminal - Speaker AorB: 4 Ω - 16 Ω Speaker A+B: 8 Ω - 16 Ω Preamplifier part: Maximum output/Rated output Pre out: 25V/1V (load 50kΩ) Rec out: 25V/320mV (THD 0.01%) Total harmonic distortion - 0.03% (when the output is 3V) Input sensitivity/impedance - Phono 1, 2: 2.5mV/50kΩ Tuner, Aux, Tape: 320mv/40kΩ Maximum permissible input (1kHz) - Phono: 200mV RIAA deviation - 20Hz to 20kHz within ±0.2dB SN ratio (IHF, A network, input short circuit) : Phono: 90dB or more Tuner, Aux, Tape: 100dB or more Frequency response (Aux→Pre out) - 5Hz to 100kHz +0 -1dB Tone control variable range - Bass: ±8dB (100Hz) / Treble: ±8dB (10kHz) Filter characteristics - Subsonic filter: 20Hz, 6dB/oct Loudness control - Low range: +7dB (100Hz) / High range: +6dB (10kHz) Muting - -20dB External dimensions - Width 434 x Height 164 x Depth 400mm (including legs, knobs and terminals) Weight - 16.5kg Amplifier operates on 100V, you will need a step down transformer Check my other ads for more quality vintage electronics.

Price: 750 USD

Location: Mississauga, Ontario

End Time: 2024-03-05T00:26:03.000Z

Shipping Cost: 75 USD