Wurlitzer Tremolo Rate?

[Babz]

The Wurlitzer  had a fixed tremolo rate. (You could only adjust intensity.)

Does anyone know of a way to find out the exact rate of the Wurlitzer's tremolo (in bpm, Hz, or some other unit)?

I would like to set my virtual Wurly tremolo to the closest to the real rate as possible.

Maybe some who owns a real Wurly knows, or could post a short sound clip (like a low note w/ Tremolo on full intensity)?  If this information is unknown, maybe I could try to figure out the rate based on a sound clip.  :?:

Thanks for any help!

Babz