Hey there! New to the forums and this thread which has been an incredible source of information for these doorbells so thank you in advance to everyone who has contributed so far! I purchased the RCA version of this doorbell and have it wired in concert with an old school 1980s vintage Nutone long tube 8 note Winchester door chime (this one requires two wires from the transformer (TRANS and COM) along with the one doorbell input wire. I've already replaced my doorbell transformer with a new 24V 40VA Honeywell unit so power should be good.
The problem is that as soon as anyone presses the button on the doorbell, my mechanical doorchime goes into an endless loop where it is constantly chiming and the doorbell becomes unresponsive to the point that it never even reboots and only by shutting off power at the circuit breaker and disconnecting the front door bell input (and temporarily connecting it to the TRANS connector to complete the circuit) can I get it to stop and the doorbell to reboot. Strangely, just powering off the circuit breaker, waiting a minute and powering it back on starts my mechanical doorbell endlessly chiming again.
I suspect this may be a similar issue related to the smaller mechanical doorbells with regards to people reporting the plungers constantly moving and that a resistor in series might fix the issue, but was wondering if anyone had a similiar experience. I really would love to keep this beautiful mechanical doorbell if at all possible.