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X66 Vibrato Driver Preamp

Dec.2010

dan.vigin

Page 1

Hammond

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





X-66

Renovating the

Vibrato Driver Preamp

by Dan.Vigin

Hammond

®

and Leslie

®

are registered trademarks of Suzuki Musical Instrument Manufacturing Co. Ltd.

Binche / Belgium

Dec.2010

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Summary of Contents for X-66

Page 1: ...r Preamp Dec 2010 dan vigin Page 1 Hammond X 66 Renovating the Vibrato Driver Preamp by Dan Vigin Hammond and Leslie are registered trademarks of Suzuki Musical Instrument Manufacturing Co Ltd Binche...

Page 2: ...is project P 3 General Description P 4 Original Vibrato Driver Preamp circuit X 66 Headroom concept P 6 New VDP circuit P 8 Transistor MJE340 P 9 Emitter resistor P 10 Schematic Diagram of new VDP P 1...

Page 3: ...el was the Drawbar channel So I decided to pursue my investigations Measured voltages were normal capacitors were previously replaced by new ones The conclusion is rather simple the driver transistor...

Page 4: ...The board AO 32297 1 is located at the back side of the scanner block under the Upper keyboard Personnaly I don t like at all the way this board has been engineered This is the kind of board commonly...

Page 5: ...tude 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 cen...

Page 6: ...s the difference between the normal operating level and the clipping level or undistorted value of an audio device During tests I found that the announced 3 5 Vpp level as indicated on Fig 5 7 can be...

Page 7: ...in order to avoid clipping For Tabs Voice signals it is less needed since levels are quite constant while spikes with Kinura tab depressed f i may justify some adequate headroom For Drawbars signals...

Page 8: ...21221 RCA 39699 was loaded by a 12K 1W resistor to ground via one 1 F 400Vdc capacitor See simplified schematic herafter The three sections of the AO 32297 1 board were configurated so and results of...

Page 9: ...y by calculation for reliability purpose the transistors MJE340 were mounted on heatsink Silicon compound was used for better heat transfert It is strongly recommended to select hFE values DC current...

Page 10: ...ch section of the VDP board it is also important to carefully select the foot emitter resistor of 33 Higher value of this 33 resistor will decrease the overall gain while lower value will increase the...

Page 11: ...G From Percussion Section Fig 5 4 X 76 From Drawbar Section Fig 5 1 T 64 Circuit Diagram Hammond X 66 Re designed Vibrato Driver Preamp File Vibrato_Driver_V1 vsd Date 30 11 2010 Issued by Dan Vigin...

Page 12: ...load condition makes no sense and since the same load value of 12 K 1W was used for both original board and new one the conditions of measurements remain identical and trustworthy Realization A shown...

Page 13: ...X66 Vibrato Driver Preamp Dec 2010 dan vigin Page 13 PCB Layouts Components side Copper side...

Page 14: ...X66 Vibrato Driver Preamp Dec 2010 dan vigin Page 14 DATASHEET MJE340...

Page 15: ...X66 Vibrato Driver Preamp Dec 2010 dan vigin Page 15...

Page 16: ...X66 Vibrato Driver Preamp Dec 2010 dan vigin Page 16...

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