Quote:
Originally Posted by Yamamaya42
The 1V2 has an absolute max heater volt rating of 1.45v and a min of 1.05.
The heater voltage for the 2av2 is, 1.8v +/- 0.27v
and the spec clearly states “ under no circumstances should heater voltage be less than 1.53v or more than 2.07v
And yes, where the may be almost the same tubes, the heater voltages make them unsuitable to be interchangeable, or at least I would never do so, thus the reason I mentioned it.
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I worked on a CTC16E, that had a 1V2. The filament dropping resistor changed value and couldn't get proper focusing.
I jumpered out the resistor and installed a 2AV2. Problem solved.