Radio Transistor Oscillator Transformer Coil RED IF 455 kHz CAN 10mm LOT 4 PCS | eBay
Roll your own I F transformers.
465 kHz IFTs and MW Oscillator Coil AM Radio Intermediate Frequency Transformers | eBay
Mini AM Radio Coil Pack - Set of 4 | 455KHz IF & Oscillator | Wiltronics
How to Align Receivers, October 1954 Popular Electronics - RF Cafe
Feedback factor of Armstrong Oscillator - Electrical Engineering Stack Exchange
Scavenging Parts From a Transistor Radio In these modern times it's not easy to find parts. Some of you may be afraid of winding coils (it took me many years to get over helixaphobia). But don't worry there are ways around it. You're going to get the parts ...