Gretsch serial dating
I see no problem in that, even if you're trying to get a vintage'ish sound.Quite on the contrary actually: If it hadn't been for cheap hi-res sound cards, I could never have afforded to experiment and record as much as I have.There are many other suitable echo units/pedals out there and some of them are better than my DD-3.
The typical settings for a rockabilly slapback echo (for guitar) on any unit are between 100 and 200 ms and very few repeats. There I use various digital delay effects (emulating tape echo for instance), as I record without echo and add it in the mix.The sound was very Many Rockabilly guitarists play a '59 Fender Bassman (or similar) - vintage or reissue. I found a way to get around that and always have the same "Bassman-sound" no matter what volume I'm playing at...I often get asked how I set the Sans Amp GT2 pedal to get a vintage sound.If you're into Surf music it's a whole different ballgame though.Here's a picture of my "live" settings for the Boss DD-3.
Many purists go on about the necessity of recording on tape, but that's nonsense.