MDB Ventures Policies

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All Ordering is via email to:
(or our alternate email to: ).

MDB Ventures does not maintain telephone support for ordering nor retail store or visitor accessible warehouse.


MDB Ventures sets merchandise prices based upon current market statistics. Employees are not allowed to change them.
Due to the highly volatile nature of the tube business, all prices are subject to change without notice.
Price shown on the website is for the item only. It does not include packaging, handling or postage. All amounts are in US Dollars.
Depending on current promotions, discounts may apply.

Shipping and Handling:

All shipment is via US Postal Service. Buyer pays for all packaging, handling, shipping and any insurance required.
Domestic (USA) shipping cost is calculated as the cost of postage plus a $2.50 packing and handling fee per shipment.
International shipping cost is calculated as the cost of postage plus a $5.00 packing and handling fee per shipment.
Buyer must email shipping location before we can provide total cost of the purchase.
Depending on current promotions, discounts may apply.

Customs Laws:

All exporting businesses are required by law to show exact purchase value on the customs documents.
MDB Ventures policy is to abide by all laws and regulations of the USA and destination countries.


Please confirm your selections and delivery address.
We will send you an invoice with complete payment instructions.


Acceptable payment is via PayPal or Money Order on a US Bank, only in US Dollars.
Shipping occurs after payment is verified. We do not accept personal checks.
Credit card orders are only available via PayPal.
International buyers must pay via PayPal.


To send money via PayPal, go to
Log in, if you already have an account. If Not, click "Sign Up" and set up an account.
Go to 'Send Money" and send the invoiced amount to
With PayPal, you can send money to any email address.
Please wait for us to send you the total price (including shipping and handling) before sending payment.

Warranty Disclaimer:

Our guarantee represents the consumer's exclusive remedy for a defective product.
MDB Ventures expressly disclaims all other warranties, expressed or implied, for the products we sell.

Limitation on Liability:

MDB Ventures shall not be liable for any indirect or consequential damages, including, but not limited to, personal injury or loss of income, arising out of the purchase or use of a product listed in this catalog, and in no event shall our liability exceed the price of the product.


All items are guaranteed to meet your satisfaction or they may be returned within 30 days for exchange or credit, providing the item is in resellable condition.
The exception is any item noted as not returnable.
Any items that have leads cut, evidence of soldering or other sign of installation modification and/or use cannot be returned unless the product is defective.
Please check and/or test your purchases upon receipt, even if the items are a back up set for future use, and notify us of any problems within the warranty period.

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.

We do not match tubes. As with microphonics, matching means different things to different people. Because of this, we do not do matching. We do however provide the test results for our tubes which allows you to select tubes that have similar test results. For most situations that should be adequate. However keep in mind that depending on the your particular situation, the test results may not be adequate for your needs.

All NOS and used tubes are guaranteed for 30 days, except for breakage or damage caused by operation outside the tube manufacturer's 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.
Items noted as being not returnable will not be accepted for return, refund or credit.
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 .
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.
Nor are items marked as being not returnable.

Restocking fee:

There is a 10% restocking fee when no evidence of product damage exists on returned products or the product is returned for other than a failure.


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.
Replacements are for equivalent items only.
A customer may request a better item for the difference in price plus any additional restockig fees. Discounts or coupons may not be applied to replacement items.


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 unless otherwise noted.
All discount and/or coupon offers are subject to change or discontinuation without notice. All discounts and/or coupons are non-transferable.

Discounts or coupons 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.

Gmail Users
Please read this note about incorrectly declared email as spam.
This can be an issue as well with other free email providers like Hotmail, AOL, and Yahoo.

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