Besides the replay-head timings the amplitude per replay-head in conjunction with the recorder head (our dry/wet ratio that is!!) is required. For the Meazzi Echomatic #1 and #2 the replay-heads are configured with paired resistors as per table and schematics.
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Meazzi Echomatic #1 partial schematics | Meazzi Echomatic #2 partial schematics |
The amplitudes or attenuation of the tape playbackheads are normally controlled by fixed resistors in series with the signal that feeds the preamp valve. The resistor value is different per pair of heads:
| Replay Head | Resistor | Estimated |
| Attenuation | ||
| Head 1 | 2K2 | -2dB |
| Head 2 | 2K2 | -2dB |
| Head 3 | 4K7 | -4dB |
| Head 4 | 4K7 | -4dB |
| Head 5 | 10K | -8dB |
| Head 6 | 10K/15K | >-8dB |
The information on resistors used is from the actual schematics of the Meazzi device. Our general understanding is that the paired replay head attenuations should be fully reflected in the patch designed.
- For the Meazzi#1 would that be 2K2/2K2/4K7/4K7/10K/10K/ and the last 10K could also be 15K in a particual configuration.
For the Meazzi#2 this would be 2K2/2K2/4K7/4K7. A 10K potentiometer is part of this configuration impacting the first 3 replay heads.
- A good initial value when building a patch is to keep close to those values ( adding a wet dB value that's acceptable like about -6dB as an inititial value) to assure it is configured like a vintage system.
Note: measurements can be done by feeding a toneburst of 440Hz (tone -A-) through the loaded echo patch and readjusting the recieved signals by selecting the dry signal as a reference to reflect 0 dB first.
-Piet
