A bass tube warmer with versatile tone adjustment. - Model Name: GLOWPLUG TUBE WARMER - Brand: EDEN - Controls: OUTPUT, WARMTH, MIX, VOLUME - Switch: ON/OFF - Frequency Adjustment: 100Hz, 1kHz, 3kHz I was using this product until recently. There are no problems such as scratchiness. My personal impression from using it, depending on the combination, but I connected it to the send/return of a pedal-type preamp. The distortion has a natural feel, but the sound becomes considerably thicker. ※Thank you for viewing the product. 　Please refrain from purchasing if you are 　nervous or seeking perfection, as this is a used item. ※Instant purchase is also possible, but I may be late in responding due to work 　circumstances, but I will definitely reply. 　Thank you.