What is uuF in tube data?

[Alan0354]

The input, output and plate to grid capacitance are given in uuF? What is this?

[Tom Phillips]

"micro micro Farads" an old term which is the same as "pico Farads"

[Alan0354]

"micro micro Farads" an old term which is the same as "pico Farads"

Thanks, I did not realize the capacitance is so low in tubes.