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Ad N Echo Model 1001 - A freshly drawn schematic of the 7199 circuit.

Ad N Echo Model 3000 - An Ad N Echo with more bells & whistles (12AX7 circuit).

Fender Echo Reverb II  - A variation on the 7199 circuit.

Standel Reverbalux   - model S41

TelRay Deluxe Organ Tone   - Hand drawn trace of a working unit

TelRay Variable Delay - Drawn from 1969 model