Thank you for viewing. This is a Warm Audio LA-2A type optical compressor. I am selling it to organize my equipment. Shortly after I started using it, I replaced all four vacuum tubes with high-end, vintage NOS tubes. * 12AX7 x 2: tang sol → mullard * 12BH7A: electro-harmonics → GE NOS tube * 6N1N (Russian) → 6005W GE NOS tube I also have the circuit sockets that used the original vacuum tubes, and I have swapped them out. (6N21N → 6005W) After the replacement, I feel that the roughness unique to vacuum tubes when driven has changed into a more refined and elegant distortion. Of course, I will include all four original vacuum tubes. Please use them as you like. The usage time is approximately within 60 hours, and it is a beautiful item with no scratches or stains. It is from a non-pet, non-smoking environment. The original box, power cord, manual, etc. are all included. It will be packed with bubble wrap in the cosmetic box and then shipped in a cardboard box. Please refrain from price negotiations. Thank you.