Vintage K40Y-9 Soviet Military Paper in Oil (PIO) capacitor -.01uF 200V. The K40Y-9 are high quality capacitors made for Russian military. The conductor is made of aluminum foil and the dielectric is oil saturated paper. Comparable in construction to the Sprague Vitamin Q's, hermetically sealed in a metal body with glass ends.
0.1 uf is the correct value for 50's, 60's & 70's Strats and some of the older Fender Precision and Jazz Bass Guitars. This value can also be used in the pre-amp stage of some tube amps. If you are uncertain of the correct value for your Fender click on the following link: