The reel to reel wasn't used as an echo...it was used as booster. I used to do the same thing with an old tube Webcor and when I wore than out, a tube Wolensak tape recorder back before fuzz tones or any kind of pedals were available. I'd plug into the mike input, use the tape recorder like a PA, and run a cord from the speaker out of the tape recorder into my amp. Crank up the tape recorder and you have a tube fuzz tone! Lew