lausmobile Tube Tester Files
Reflector 02/1989, typical sample of four tested. This tube has probably the smallest plate assembly for the mini-9 package tube - about 2mm total width! Compare it to stock 12AX7. This tube is intended for oscillator / heterodyne use, seldom used for audio amplification (Yuri Makarov's phono stage is one known to me). It loves oscillating indeed, and it took a 47 kOhm grid-cathode shunt to quiet it down.
|Standard specifications per each triode|
|Parameter||Maximum||Operating Point||Measured (*)|
1. Full power curve - 6.3V heater. Disregard color coding - 47k resistor disabled grid current tracking.
2. 10 mA closeup
3. 10mA closeup, curves at 5.0V heater superimposed on the above chart
4. Gm / Mu / Rp
Legend: White curves: Ig<5uA Yellow: 5<Ig<20uA Red: 20<Ig<300uA. Measurements terminate at Ig>300uA
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