Enclosed, 4-hole mount chokes Tolerance of 15% on both inductance & resistance. Inductances measured at rated D.C. current. Minimum 8" long leads. Units will exhibit less inductance at slightly higher currents or more at lower currents. Perfect for high voltage power supply filtering, case matches power transformers & tube audio output transformers. Units are vacuum impregnated with polyurethane varnish for quiet and long life operation. For more sizes and voltages (open - bracket mount type) - see P-T154-P-T156-X Operating temperature range is -40C to 85C Proper Henry testing requires an LCR meter in junction with a 25A power supply that does allow for DC bias as well a higher applied AC drive voltage to meet the test specifications. Part No. Current Resistance Maximum Operating Voltage P-T193T 0.05 H 2000 mA 0.7 Ω 300 VDC P-T193K 2.6 H 300 mA 21 Ω 800 VDC P-T193N 3 H 500 mA 35 Ω 600 VDC P-T193H 5 H 200 mA 65 Ω 600 VDC P-T193L 5 H 300 mA 57 Ω 800 VDC P-T1