Specification Brand : YTMJPQQJI BulletPoint : Preamps BulletPoint1 : The builts-in battery is rechargeable and can last for 10 hours on a single charging. BulletPoint2 : Gains: When the capacitance value of the Piezo Pickup is 10nf, it is about 20db,The lower frequency limit is 30Hz BulletPoint3 : This machine is a JFET high impedance charging type amplifiers circuit, which is not affected by the length of the input line and have nonfrictions effect; BulletPoint4 : Input impedance, greater than 10MΩ BulletPoint5 : Suitable for surfaces mounted Piezo Pickup; Color : One Color ExternallyAssignedProductIdentifier : 7440057470655 ItemName : Two ECC82 12AU7 Vacuum Tube amplifiers ItemPackageDimensions_Height : 1 centimeters ItemPackageDimensions_Length : 1 centimeters ItemPackageDimensions_Width : 1 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : electric-guitar-amplifier-preamps Manufacturer : YTMJPQQJI ModelName : YTMJPQQJI ModelNumber : YTMJPQQJI NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : YTMJPQQJI ProductDescription : Preamps Two ECC82 12AU7 vacuum tube amplifiers ProductSiteLaunchDate : 2025-05-06T08:32:32.180Z Size : One Size UnitCount : 1 UnspscCode : 52161547 WarrantyDescription : No Warranty