X66 Vibrato Driver Preamp Dec.2010
dan.vigin
Page 5
The three Vibrato Driver Preamp's ( VDP's for short ) are located on the same board.
The concept of each VDP is the same however they all have some slight differences
that have to be taken into consideration.
In fact, the role of each VDP is to procure enought amplitude to 'drive' its
corresponding vibrato phase shift line that is linked directly to the scanner.
The VDP board is then composed of three sections:
- on the left, the TREBLE VIBRATO DRIVE PPREAMP
- in the center, the TAB VOICE VIBRATO DRIVE PREAMP
- on the right, the CELESTE VIBRATO DRIVE PREAMP
There is no so much to tell about the circuitry. Basic 'Common Emitter' configuration is
used with a partial decoupling in the emitter resistors.
Refer to original schematic diagram hereunder.
Fig 5-7 (partial) of X-66 Service Manual.
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