On 2021-07-07 12:29, Victor Rosenthal 4X6GP wrote: > Remember PTTL? > Poorly Tinned Toroid Leads. Actually, I suspect that when I scrubbed it with isopropyl alcohol, it shorted out one or more high-impedance crystals; because at one point, it was tuning WWV with no heterodynes - just like an AM receiver. When the IPA dried off, it came back. - Jerry KF6VB