Rare 1920\'s Amperex 211-D Tubes Fully Tested
Beautiful and Rare 1920\'s Amperex 211-DPower Triodes.
This great example of a 1920\'s 211-D ranks with the other great 211\'sincludingWestern Electric and United Electronic.
Very Early Brass Base Types
They have Rock solid construction, Tight Bases, and no debris inside of the Vacuum.The Tubes have been tested at their Full rating of 1200 volts on the Plate and-75 grid volts yielding:
New Spec\'s = 4500 uMhos at 150 ma.
Tube 1 = 4200 uMhos. 140 ma.
Tube 2 = 4150 uMhos. 140 ma.
Filament 10volts 3.25 amps
They have been tested on a special tester that provides the full voltage and amperage needed to test these tubes.
Of course the Tube will most likely never be run at 200 watts, but it is up to the task if need be.
So grab these tubes while you can as there are very few sold in any year.
