"Old echoplexes had this amazing out of tune warble to the repeats... you can't get that with the new tape echos!"

Bzzzzzzzzzzzt. Wrong!

The lovely warble was caused from the rubber roller being old, hardening, and developing a flat spot.
If you want your TTE to be "out of tune," just take a file and sand a slight flat spot on the rubber roller.... violá. TTE owners contact me and I'll send you an extra roller -- keep one round and keep one "warbly!"