We do not test for microphonics. It is a highly subjective test and we do not have the equipment to make a qualitative test that would have any real meaning.
All NOS and used tubes are guaranteed for 30 days, except for breakage or damage caused by operation outside the tube manufacturers’ specified ratings. Please check all tubes upon receipt. If there is a problem, please notify us immediately.
If the NOS or used tube does not function as described, you may return it for a credit or replacement. Always email first before returning tubes to get a return authorization. For obvious reasons, we cannot guarentee our Dud or Low Grade tubes. The Unknown tubes are treated on a case by case basis. Because some tubes are rare, we may not have a replacement available. In the case of NOS tubes, we may have a Used tube available. Always contact us first for availability.
After contacting us, we will take the item back for evaluation by our technicians.
We will notify you with a decision about replacement or credit after the evaluation.
Should it be necessary to return merchandise for exchange or credit,
please e-mail sales@MDBVentures.com.
No returns should be made without contacting MDB Ventures for authorization.
All returns should be sent promptly. we must receive all returns within 15 days from
authorization or the return will no longer be authorized.
We reserve the right to charge a restocking fee when no evidence of product failure exists.
Not covered by our warranty are tubes that are broken or damaged after our shipment, tubes that are microphonic or tubes used in applications that exceed the manufacturer's specified ratings, such as sweep tubes in power amplifiers, or rectifiers being used at higher than rated voltages or current.
Our normal procedure is to credit your account when an item is returned. In special cases we may authorize a refund. If payment was made via PayPal, the refund will be placed in your PayPal account. We do not refund items paid for by a money order. We do not refund postage, shipping, handling, customs duties or insurance costs. Nor do we refund customer return postage fees.
The customer pays for all return postage fees. The customer also pays for postage and insurance (optional) for sending the replacement item(s). We do not charge handling or packing fees for replacement shipments.
Any discount or coupons will be applied to merchandise price only. Any other charge included on the order, e.g. taxes, shipping, handling and packaging, will not be affected or altered by exercising the discount or coupon. The discount or coupon is not valid on previously purchased merchandise; not eligible for purchases of products marked as not eligible for "coupons or promotional discounts;" not valid on purchases made from third parties; and may not be combined with any other coupon or discount promotion. All discount and/or coupon offers are subject to change or discontinuation without notice. All discounts and/or coupons are non-transferable. They may not be carried over to other orders. There will be no cash or credit back issued on a discount or coupon. Any discount or coupon offer's value will not be refunded on a merchandise return. There will be no cash value or "rain checks" issued against discount or coupon purchases.
Other restrictions may apply.