The P331 Tube Loading Amplifier is covered by a limited warranty against manufacturing defects in materials and/or workmanship for a period of five (5) years from the date of original purchase and only after proper registration which should be submitted by completing the on line registration form at: www.whitestoneaudio.com/register

Whitestone Audio Instruments, LLC’s sole obligation under this warranty is to provide, without charge, replacement parts and labor for the above referenced defects. Vacuum tubes and other consumables such as LEDs are not covered under these terms. Vacuum tubes and LEDs are covered for a period of six (6) months with proper registration.

This warranty does not cover damage due to misuse or abuse, modification, accidental damage or negligence. The warranty is also void if the P331 is repaired or altered by anyone not authorized, in writing, by Whitestone Audio Instruments, LLC.

If it is determined the P331 is eligible for warranty repair, a return authorization must be obtained from Whitestone Audio Instruments, LLC prior to shipment. Please don’t ship equipment back to us without first obtaining this authorization. It’s simply for organizational reasons and will expedite your warranty claim. Please return the unit in its original packaging. Make sure to not discard the P331’s carton and custom foam insert after purchase. These cartons were specifically designed to protect the P331 during shipping. If the unit is not returned in original packaging, owner will be charged for new factory packaging. Include a note in the box that includes the owner’s name, address, telephone number, email address as well as a description of the issue to be repaired. The owner pays for shipping the unit to the address provided with the return authorization and we suggest the shipment be insured for the P331’s full value. Whitestone Audio Instruments will not be held liable for damage during shipping. After repair, the unit will be shipped to the customer prepaid and insured. Whitestone Audio Instruments, LLC will not pay for express or overnight shipping nor for shipments to locations outside the USA.

Whitestone Audio Instruments, LLC is in no way responsible for indirect, incidental or consequential damages arising from the use or failure of this product, including injury to persons or property. Any and all warranties of merchantability and fitness implied by law are limited to the duration of this warranty. This limited warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

All specifications are subject to change without notice. 

Statements within this website or in the P331 owner’s manual regarding the suitability of the P331 for certain types of applications are based on Whitestone Audio Instruments, LLC’s knowledge of typical requirements that are often placed on pro audio products in generic applications. Such statements are not binding statements about the suitability of the P331 for a particular application. It is the customer’s responsibility to validate that the P331 Tube Loading Amplifier is suitable for use in a particular application. Parameters provided in this website, owner’s manual, data sheets and/or specifications may vary in different applications and on different source material. Performance may vary over time.