DENON PMA-680R Integrated Amplifier

This integrated amplifier pursues pure sound quality while also focusing on operability, achieved through the use of a large toroidal transformer and a new SLDC structure.

Unlike conventional transformers, the toroidal transformer has a coil wound around a donut-shaped ring core, offering superior characteristics in terms of stable current supply, leakage flux prevention, and vibration prevention.

To suppress mutual interference between each circuit, the new S.L.D.C. (Signal Level Divided Construction) structure is employed.

It is equipped with an equalizer amplifier that supports both MC/MM cartridges through switching operations.

A source direct switch is included, which, when turned on, bypasses control circuits such as Bass, Treble, Balance, and Loudness.

(From a web search)

Model: Stereo Integrated Amplifier

Rated Output (20Hz～20kHz) Stereo: 65W+65W (8Ω)

Weight: 7.8kg

External Dimensions: Width 434 x Height 140 x Depth 353mm

Retail Price: ¥46,800 (around 1992)

(From a web search)

★ Condition

Inspected and adjusted in each part with simple maintenance (details are described in the profile)

Additionally, two power supply transistors have been replaced.

Basic operations of each RCA input, REC output, headphone jack, and various switches have been confirmed.

PHONO input has not been confirmed (selector operation has been confirmed).

There are no major scratches or cracks, but there are minor scratches and shine (please check the photos).

Please understand that sound quality depends on personal preference.

★ Accessories

None

★ Notes

Remote control is not included.

Please use the product within the range of its performance (e.g., speakers).

This is an old product. Please purchase only if you are satisfied.

No other defects were found during the inspection.

If you have any questions, please ask, and I will check accordingly.