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You mentioned the relay requires DC for the coil so there is at least one rectifier and likely a filter cap following the rectifier. How are you measuring the DCV feeding the coil? A simple single diode/half-wave rectifier with minimal filtering will result in a "lumpy" waveform that will result in a measurement error with a "minimalistic" meter.12.6 VAC was (is?) a common secondary voltage since it was used for tube filament applications. Also be aware that a lightly loaded xfmr secondary will provide a higher voltage.There is a bit of "seat of the pants" when selecting transformers.Bri
You mentioned the relay requires DC for the coil so there is at least one rectifier and likely a filter cap following the rectifier. How are you measuring the DCV feeding the coil? A simple single diode/half-wave rectifier with minimal filtering will result in a "lumpy" waveform that will result in a measurement error with a "minimalistic" meter.
12.6 VAC was (is?) a common secondary voltage since it was used for tube filament applications. Also be aware that a lightly loaded xfmr secondary will provide a higher voltage.
There is a bit of "seat of the pants" when selecting transformers.
Bri
