Tube testing service
PLEASE NOTE: Standard testing is included in the price of all the tubes posted on our website. This service is for tubes you send us from your own collection.
All tests will be performed on the laboratory grade Amplitrex AT1000. Custom high voltage test equipment is also available for tube types that exceed 500 Volts.
Standard test -- $3.00 per tube ($25 minimum order)
Our standard tube testing service includes the following:
- current draw (mA)†
- transconductance (Gm)†
- gas current (mA)
- screening for shorts and leakage
† Results are given in percentages of value compared to the expected value for new tubes of that type. The actual mA and Gm readings are also available upon request. Test results for rectifier tubes are given in actual voltage drop readings for each section. These voltage drop numbers are then compared with expected voltage drops based on tube type.
Premium test† -- $6.00 per tube ($25 minimum order)
† Not available for rectifier tubes.
- High voltage testing -- 500+ Volts ($12 per tube)
- Repair broken guide pins ($5 per tube)
- Glue loose bases ($3 per tube)
- Straighten pins -- 9-pin & 7-pin tubes only ($2 per tube)
- New white boxes (20 cents each)
Please pack your tubes securely and use a trackable, insured shipping method to send them to this address:
TC Tubes, LLC
483 Hopkins Street
St. Paul, MN 55130-4411
Follow the link below to contact us for an estimate. Most test orders can be processed and ready to return within 3 business days. Once the testing is complete we will contact you with preliminary results and send you an invoice for the total (we accept payment via Paypal, credit card, or check).
Request an estimate
TC Tubes specializes in precision testing and matching of vintage and new production vacuum tubes for guitar & bass players, audiophiles, and DIY tube audio enthusiasts. Our website features secure payment options and fast, convenient shipping around the world.