Accuphase C-270, Reference Level Stereo Preamplifier

The Accuphase C-270 stereo preamplifier followed the flow of C-280. The sound quality is magnificently transparent and emphasizes all the texture of the original sound field. 

The circuit configuration is all stage "Cascode" class A push-pull configuration to improve the element characteristics before NFB is applied. The cascode method combines two amplifying elements in a column and operates as a single element. It increases the input impedance and gain, and at the same time greatly improves the high-frequency characteristics. Linearity is also maintained up to the operating limit of the device, reducing distortion and improving the signal-to-noise ratio.

A DC servo system is used for all unit amplifiers. It detects the direct current generated at the output and returns to the input, so that the output correctly maintains the 0 potential. As a result, all signal systems from the input to the output of the analog disk (AD) are directly connected, and high-quality playback sound without coloring is obtained.

The C270 is equipped with a power transformer for the left and right channels, and is supplied by a winding for each unit amplifier. In order to provide a pure and powerful power supply, we have adopted a multiple power supply system that passes through a constant voltage power supply for each unit amplifier. The rectifier and filter capacitor are placed near the transformer. However, the constant voltage power supply circuit is housed in the housing together with the unit amplifier, successfully keeps the source impedance low over a wide range.

In order to configure the shortest and straight signal path, relays are installed in the signal path where switching is necessary, and these relays are controlled electronically by logic circuits for switching. The relay uses a sealed type relay developed especially for audio equipment. The contact is a crossbar twin system with high quality, low contact resistance and high durability.

Since the signal level of an equalizer amplifier is very weak, it is easily affected by inherent noise. Therefore, a low-noise FET is selected as the input FET. In addition, the capacitor uses a compound dielectric non-inductive type, which was developed especially for audio with an emphasis on sound quality. Since it is non-inductive, it has excellent characteristics outside the audible band. Moreover, it is filled with epoxy resin to prevent self-vibration caused by signal voltage. Can sit n' spit this tech talk all day but here's where the rubber meets the road, this is one of the finest preamp/linstage components we've ever experienced not so much for what it does but for what it doesn't do; and that's color the signal in ANY way. This is the quietest, most neutral and confidence inspiring unit we've yet to hook to our ARC Reference 250 monos. Paired with a set of massive Usher, CP 8872II this system is staggeringly great. Stops you right in your tracks. 

This Accuphase has been thoroughly gone through and fully serviced here at the Andover shop by our expert tech staff. It performs flawlessly and is in fabulous condition showing only the slightest signs of wear; total precision piece of kit.

Demos are always welcome here in Andover or purchase with confidence here on this site.

Accuphase C-270 Preamp: $2499 plus sales tax and shipping when applicable.