Sprague Circle 2 - .01uF Z5U 1KV 

• Tested: 0.009uF
• DF: .019 
• ESR: 217ohm 
• Leakage: 0uA @600V

(roughly 1958–1969)

That circle 2 style logo is commonly found in:

• pre-CBS Fender amps
• early Blackface/Silverface era equipment
• Hammond organs
• tube hi-fi gear
• vintage TVs/radios

Each capacitor is individually tested for capacitance, leakage, and voltage integrity using professional vintage-era test equipment including the Sencore LC75 Z Meter, B&K Precision 878, Heathkit LC Bridge, common Chinese LCR digital handheld.

Capacitance and Dissipation Factor (DF) measurements are performed at 1 kHz, a frequency better suited for evaluating many vintage paper/wax dielectric capacitors used in classic tube audio equipment. High DF (> ~.050) means the capacitor's material absorbs some of the signal making it more nonlinear which is poor quality for modern electronics and a very low Q (which is the inverse of DF), but surprisingly great for audio tonal shaping applications. 

These capacitors are intended for vintage electronics restoration, experimental audio applications, and collector use.

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