Telefunken Smooth Plate 12AX7 ECC83 Vacuum Tube OA3 Gebraucht This lot of three US-made

This lot of three US-made type 42 tubes was tested our Paul Hart-calibrated TV7/U for shorts

new in box Sylvania 3Q5GT tube -- and another just like it -- tested to spec on Paul Hart-calibrated TV7/U

28/27 and 33/26 where minimum (65%) is 18/18

There is a shield between the triodes for reduced cross talk

2 milliamps' plate current where new / nominal is within one standard deviation of 1900

Telefunken Smooth Plate 12AX7 ECC83 Vacuum Tube OA3 Gebraucht This lot of three US-madeThis Telefunken smooth plate 12AX7 ECC83 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they measured as follows: It measured 38 36 where minimum (65%) is 32 32 and 100% is 49 49. It has excellent flashing and a chunky O getter. Its base has the requisite Telefunken diamond embossed with a 62 2 code. I am playing it in my Pro Ject Tube Box S phono preamplifier with an