Try DIGI-KEY for the Zener Diode. Trouble is, again, you won't hear much, if any, of the ring.
What will work, and no I don't have a schematic, would be a Full wave bridge, rated at 1 amp and 400 volts or more, with the AC leads across T and R, with a, .47 ufd 200v or more rating, capacitor in series with either T or R. Use the dc output of the bridge to charge a capacitor. Use the charged cap to operate a low current, low voltage relay, with a resistor in series with the relay coil to slow the capacitor discharge, to apply a 600 to 1.2K ohm resistance across T and R. I'm guessing you'd spend about 10-15 bucks max on the parts. Trouble is, without specs for the capacitor, resistor' and relay, you'll spend 3 times that much buying assorted parts to try and get the line short timing where you want it.
John C.
