[Boatanchors] 25T

[B Riches]

I am working on a German Blaupunkt radio and had to replace a leaky condenser.  
It was a small mica cap marked with 25T on it and the schematic said 25T also.
With 300 volts on the cap it showed 5 ua of leakage but and that was enough to upset the mixer grid circuit.  I measured the capacity and it was 50 and replaced it with that capacity and the radio worked fine,
That may not have been the correct capacity due to the leakage as measured with the Sencore tester
Question:
Any one know what "T" means.  there are also some caps marked 2.5T.
73,
Bill Riches, WA2DVUCape May, NJ