There are several suppliers all over the world, for passive components: Mouser, RS-components, Farnell, Digi-Key, … but only one “Area 51” @ quadesl.org for mylar, saran and elvamide/calaton.
You can get most resistors by Vishay, at Mouser or Digi-Key. Particular attention is required for resistors used in audio input transformer. VR37 kind is a minimum, VR68 is recommended (1W vs 1/2W):
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