Tube Testing Service
Our tube testing service includes results for current draw (mA), amplification factor (Gm), gas current (mA), and noise/microphonics for each tube. Tubes are also screened for shorts and leakage. (NOTE: This testing is included in the price of all the tubes posted on our site. This service is for tubes you send us from your own collection.) All tests will be performed on the laboratory grade Amplitrex AT1000, as long as the AT1000 has provision for your particular tube type(s).Test results for mA and Gm are given in percentages of value compared to the nominal new value for the tube type. The actualmA and Gm readings are also available upon request. If you have less than 10 tubes to test, the price is $2.50 per tube. If you have 10 or more tubes to test, the price is $2.00 per tube. Return shipping via USPS will also be added to the total (usually between $5-$7). Once you have placed your order,ship yourtubes to the following address: TC Tubes, LLC 483 Hopkins Street St. Paul, MN 55130-4411 Tubes are processed and ready to return to you within 2 business days of receiving your package.