It's not directly possible, as the earlier chime sterns just fired them as solenoids (not using a separate board that you could swap), but because of the design of the SB-100 sound card (where there's a separate circuit with a binary on/off input for each of the three tones) it'd technically be possible to make a new board that replicates the sound select portion (a few and gates) and connects them to transistors instead to drive chimes.

if you take a look at this article on the SB 100 (
http://www.techdose.com/projects/Stern-Pinball-SB100-Sound-Board/346/page3.html ), you'll see that there are three mutlivibrators, each controlled by one of the gates on U7, through pins on U3. I don't have access to my Dracula at the minute to try it, but if I did, I'd connect LEDs from ground to each of those pins on U3, to confirm my understanding of how the sound board works. Each LED should come on when its corresponding tone is played. The main thing I'd worry about is if the tones last too long, and you'd be locking on the coils for a bit instead of just pulsing them, but you'd have to observe the LEDs to see (unless you have a logic probe you could use on the original board, or something). This is all theoretical, but if you do try it out I'd be happy to help. I think you're crazy though, those monotone bloops are way better than chimes!

I enjoy mine, even if it is trashed.. I've never found a recording of the simulated chimes, no idea what they sound like

Dracula uses the Rev c board which didn't have the chime emulating circuitry

Why not adjust the pitch?