[turretslug]

With this era of comms receivers, the BFO is arranged to whisper gently into the envelope detector to generate CW sidetone and is operated at very low power with associated high value anode feed resistors- Eddystone tended to use rather "average" quality carbon composition resistors and the high value ones are prone to going rather higher in value or even open circuit with age. The associated paper dielectric decoupling capacitors tend to go electrically leaky, further hobbling associated circuitry.