For sale, we have a linestage preamp manufactured by the Hengdong Audio Science and Technology Company. The Model JA-3 preamp has three inputs, one balanced, and two unbalanced. The output terminals are balanced. Upon research, it appears that the Hengdong Audio and ScienceTechnology Company is the manufacturer of Jungson audio products. This appears to be an early model, and while it does not have the Jungson name on it, it does have the same Logo. We could not find any information on the web about this model, but the company is still in business, and is currently manufacturing some nice gear. We bought a collection of audio gear from an audiophile, and this unit was included. Having no experience with this brand, we did not think much of it. Upon further inspection, we found that the build quality was quite good. The case is solid and heavy, underneath we noticed the two transformers, and a very well laid out design. We were very pleased with how the unit sounds. All pots and switches were cleaned, and then treated with Deoxit F5 and D5 respectively.
Physically the unit is in very good condition. There are a few scratches on the top cover toward the rear, and a small nick on the bottom left corner of the faceplate. The unit presents itself very well.
We don't have the original box for this unit, but we take packaging and shipping seriously. We spare no expense and use heavy duty boxes, several inches of polyethylene foam on all sides of the unit, and use water activated, fiber reinforced tape on all seams.