Description
DiscriptionDENON PMA-255 Integrated AmplifierIt was maintained and used.By attaching and detaching the short pin, it can be used as an integrated amplifier or a power amplifier.?Power amplifier sectionThe output stage uses triple diffused mesa type PNP and NPN power transistors with uniform characteristics, a differential amplification all-stage direct connection circuit, a large radiator with good heat dissipation effect, a powerful power supply circuit, etc. to ensure ample sine wave continuous rated output. It is designed with the following in mind.Over a wide frequency band of 20Hz to 20kHz, output deviation is extremely small, and intermodulation distortion and harmonic distortion are reduced. In particular, the design combines circuit technology and component technology to prevent noise distortion from increasing at low outputs, further improving the S/N of the power stage.By designing the output circuit board, selecting components, and considering the wiring, we have lowered the output impedance from ultra-low to high frequencies, so the power amplifier always operates stably against the various connected speaker loads. Masu.It has a built-in quick-response protection circuit that prevents damage to the power transistor from erroneous operation such as shorting of the speaker terminals, and protects the speaker if an abnormality occurs inside the amplifier, further increasing safety.The speaker terminals have a screw type structure to reduce contact resistance for a more secure connection.?Equalizer amplifier sectionIt uses a 3-stage direct-connection E-E feedback type NPN transistor, which has a high power utilization rate and low distortion, and has excellent basic performance as an amplifier. For this reason, the circuit has a simple circuit configuration with three amplifier elements, operates with a high voltage of 70V supplied from a stabilized power supply, increases voltage gain during open loop, and improves transient characteristics and S/N by DC feedback and AC feedback. , distortion, dynamic range, and other characteristics have been further improved to deliver the best performance for disc playback.The voltage gain of the equalizer amplifier has been increased to 38.8 dB (87 times), and the high frequency jump of the RIAA characteristic caused by the lack of equalizer amplifier gain has been completely suppressed. Combined with the use of carefully selected equalizer elements CR, the RIAA deviation can be reduced. Guaranteed high accuracy within ±0.3dB in the frequency band between 20Hz and 20kHz.The items are protected in sturdy packaging and will shipped to you.If you have any questions, please contact us before making a successful bid.International Buyers - Please Note:[ Voltage & Plug ]Japan Voltage : 100VPlease check your countrys voltage before order. Buyer may need transformer to use our item,Because most of countrys voltage is higher than 100V. Please check your countrys plug. Buyer may need exchange plug.We can not accept return and refund if you broke item with these troubles. [ Menu & Manual Language ]Our item has only Menu & Manual in Japanese Language basically.We can not accept return nor refund with language troubles. NOTEImport duties, taxes and charges are not included in the item price or shipping charges.These charges are the buyers responsibility.Please check with your countrys customs office to determine what these additional costs will be prior to bidding/buying.We do not mark the value of goods below the selling price on invoices, or mark goods as gift. These are illegal according to Customs regulations.
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