The Pioneer ST-20 vacuum tube amplifier allows for sound quality adjustment with volume, tone control, and speaker selection functions. - Brand: Pioneer - Model: ST-20 - Type: Vacuum tube amplifier - Functions: Volume adjustment, tone control, speaker selection - Connection terminals: Headphone jack, cartridge terminals - Adjustment functions: Balance, low down, mute - Power switch: ON/OFF switch Thank you for viewing. ◆Product Description◆ This is a Pioneer SA-8800II stereo amplifier. ◆Operation Check◆ We have confirmed that the power turns on when plugged into an outlet. We have not performed any other operational checks or tests. ◆Product Size◆ Approximately Height 15cm × Width 42cm × Depth 39cm Due to being a used item, there may be scratches, stains, dirt, discoloration, scuffs, and signs of use. Please understand that this is a used item, check the photos, and purchase only if you are satisfied with the condition. ※If you have any questions about the condition of the product, please inquire before purchasing. Please note that we cannot accept claims, returns, or cancellations regarding defects after purchase. ※The actual product color and the color in the photos may differ slightly depending on your computer or smartphone screen. Please understand this beforehand. Due to reasons that we cannot determine or explain sufficiently, the condition of the product may change during storage, but we will deliver it as is, so please understand this beforehand.