It is found that the Pleiades Electra 2 can operate very well at 8 volts.
As the resistor dropped 12V lead acid battery was discharging the amplifier worked very well up to not less than 7.1V.
The cathode resistor may be omitted. Without it there seems to be even more definition and leaving it out permits better operation at lower voltage. Further testing has to be done.
Assuming 7.4V is a suitable voltage supply just two li ion batteries can be used.
Each rated at 3.7V may prove to make a great combination.
The Pleiades Electra power consumption at such conditions is about 600mA.
So with just 2 small (AA size) li ion batteries of 700mAh capacity, playing time will be about 1 hour.
They may be mounted using a 2 AA battery holder directly on the side inside the amplifier.
If larger li ion batteries are to be used the amplifier has to be enlarged.
One must work very carefully with li ion batteries to keep safety, fuses etc.
The song used for these tests using the lead acid battery is Constant Craving - K.D. Lang
It is a joy listening to music though the Pleiades Electra 2.
Now it is just 2 electron tubes and 2 batteries.
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