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These Mullard EL34 tubes were removed from a Dynaco ST70 stereo amplifier. They are all Xf1 tubes and feature a fat base and double-O getters. The date codes are B1E4, B1E3 (2), and B1F4. All are in great physical except for the B1F4, as the plate on the tube appears to have gotten got (see picture). Cooincidently, that is the tube that tests the highest for both iP and Gm. Gm (mA/V) has a minimum of 7.7, and NOS typically reads 11.00. These tubes measured at 11.39, 11.22, 11,78, and 11.55. Plate current (iP) measured at 92.6, 95.8, 110.3, and 101.8mA. TESTING: The tube(s) in this sale have been tested on an Amplitrex AT-1000 tube tester, 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. The AT-1000 is also used to screen for unwanted noise and microphonics, which is something very few eBay sellers do! Please note that no tube testers are identical and my test results will likely differ slightly from yours. RETURNS: If youre unhappy with your purchase for any reason, I will gladly take it back for a full refund. Please note that I reserve the right to issue partial refunds if tubes are missing, damaged, or without original boxes (when applicable). 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)
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