10 Pack 503 Marked .05µF 50V Ceramic Disc Capacitors — Tested 33–34nF Off-Nominal Bench Lot
$2.99
10-piece pack of unbranded orange ceramic disc capacitors marked “503” and labeled .05µF 50V. The 503 capacitor code normally converts to 50,000pF / 50nF / .05µF, but random sample bench testing from this lot measured approximately 34nF in Cp mode at 1 kHz and approximately 33nF at 100 kHz. Because the tested value is significantly below the marked .05µF nominal value, this pack is being listed honestly as an off-nominal / bench-use lot rather than a clean precision .05µF repair capacitor pack. These may still be useful for hobby work, sorting, experimentation, non-critical bypass/coupling use, educational projects, bench stock, or parts-drawer supply where the buyer intends to test and select values before installation.
Historical Note / Product Story: Ceramic disc capacitors marked 503 were widely used for decades in older radios, CB equipment, consumer electronics, audio circuits, hobby gear, and general through-hole repair work. Values around .05µF were commonly used for bypassing, coupling, filtering, tone shaping, and general circuit service. This lot is a good example of why RF Boneyard™ includes real bench notes: the parts are marked and labeled as .05µF 50V, but sample testing shows them reading closer to .033µF / 33–34nF. Instead of hiding that, this listing preserves the real salvage and bench-test story so buyers know exactly what they are getting.
Origin Tracker
NOS / New Old Stock
Unused new old stock from legacy inventory. Packaging, age, and cosmetic condition may vary.
Pipeline quantities are informational and may change after arrival, inspection, sorting, testing, or donor teardown.
Compatible Radios / Boards
Suitable for hobby electronics, bench experimentation, parts sorting, educational projects, general through-hole repair, vintage radio bench work, CB radio repair experimentation, non-critical bypass/coupling/filtering applications, and parts drawers where the buyer will verify capacitance before final installation. Not recommended as a precision .05µF replacement without buyer testing.
RF Boneyard Bench Notes
Random sample tested from lot. Capacitor body is marked 503, which normally indicates 50,000pF / 50nF / .05µF, and the lot label identifies these as .05µF 50V. Sample measured approximately 34nF in Cp mode at 1 kHz and approximately 33nF at 100 kHz. Because the tested value is significantly below the marked nominal .05µF value, this listing is sold as an off-nominal / bench-use lot. Buyer should test and verify before use in critical circuits.
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