Hi guys,
Maybe some of you have seen my OTL circlotron thread but I'd like to start one in regards to tube data sheets and real measurements.
Looking at the 6080 data sheets I set
-40 bias
@ 100 volts
should give me about 60 mA.
I had about 100 volts +- 10 volts
-40 grid bias +- 5 volts
I have 3.9R cathode resistors to avoid current hogging and to measure current.
I measured 140mA and 115mA across the 2 cathodes of 1 triode!!!!!
0.55 volts/3.9 * 1000 = 140
0.45/3.9* 1000 = 115
So definitely an adjustment of the power supply voltage and grid bias needs a large adjustment to get it down to 80-100mA max.
Have other people had similar experiences with data sheet info?
Maybe some of you have seen my OTL circlotron thread but I'd like to start one in regards to tube data sheets and real measurements.
Looking at the 6080 data sheets I set
-40 bias
@ 100 volts
should give me about 60 mA.
I had about 100 volts +- 10 volts
-40 grid bias +- 5 volts
I have 3.9R cathode resistors to avoid current hogging and to measure current.
I measured 140mA and 115mA across the 2 cathodes of 1 triode!!!!!
0.55 volts/3.9 * 1000 = 140
0.45/3.9* 1000 = 115
So definitely an adjustment of the power supply voltage and grid bias needs a large adjustment to get it down to 80-100mA max.
Have other people had similar experiences with data sheet info?