This Western Electric tube features a white ceramic base, black plates, and a foil-D getter. The base is a little loose, but from a visual inspection the vacuum looks OK. Testing was done on the Amplitrex AT-1000 with plate voltage of 250VDC. If you're going to compare test results upon receiving the tubes, please note the plate voltage in your tester as this makes a big difference in the numbers you'll see. Minimum transconductance (Gm) on the Amplitrex tester is 0.9 and NOS tubes typically test around 1.3. This tube tested at 1.8 with a plate current of 10.4mA. The Amplitrex did indicate gas at 55mA. I repeated the test several times and the number did not go down. Because of this, the tube is being sold as-is with no returns allowed.
TESTING: The tube(s) in this sale have been tested on an Amplitrex AT-1000 tube tester (fixed-bias mode), which is a laboratory-grade tester capable of supplying the user with precision measurements. It tests for heater-cathode leakage, gas, mutual conductance, and plate current. Please note that no tube testers are identical and my test results will likely differ slightly from yours.
INTERNATIONAL BUYERS: Please read and understand the following before making a purchase:- First Class Mail can take more than 60 days for delivery, so please be patient. If you need your tubes faster, select USPS Priority Mail or USPS Express Mail.
- I will not declare a lower value for any reason.
OTHER TUBES FOR SALE: I have many premium tubes for sale and will combine shipping if you buy multiple items. Click the links below to see what else is available!- Audio Preamp Tubes (12AX7, 12AY7, 6SN7, 6DJ8, etc)
- Audio Power Tubes (6V6, 6L6, 6550, EL34, etc)
- Audio Rectifier Tubes (5Y3, 5U4, GZ34, etc)
- Radio Transmitting Tubes (6146, 811A, 3-500Z, etc)
- Other Tubes and Accessories (eye tubes, Nixie tubes, CRTs, sockets, etc)