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capacitors were rated at 20 % tolerance. I have no way of verifying  how
accurate this 20% rating claim is.  I went and checked the old wax
capacitors  that were originally in my 1962 C3 but there was no
tolerance rating  written on them. I checked the red mylar caps and
transformer coil filters tray ( originally from a 1970 T-300 ) that are
now in my C3 and I checked the red mylar caps  in my late 60's / early
70's  L-143 and  these do have a 10 % tolerance rating written on them.
Earlier this year I measured the mfd values of the red mylar capacitors
that are now in my C3 and all of these capacitors are well within 10 %
of their 0.255 mfd and their 0.1 mfd ratings so therefore these red
mylar caps would more or less still be properly matched to their
transformer coil filters. The ESR is another factor to consider but I am
not sure how this actually affects the output levels of the TG notes .