REVOX B795 Direct-Drive Turntable Instruction Manual

REVOX B795 Direct-Drive Turntable

WIRING

TURNTABLE DRIVE ELECTRONICS

TONE ARM ELECTRONICS

WHAT IS IN THE BOX

HOW TO USE

• Push button POWER
• Push button “33”
• Push button “45”
• Push button ◄inward movement
• Push button lowering/lifting
• Push button ► outward movement
• Phono cartridge/ Stylus unit
• Stylus illumination
• Stylus brush
• 45-rpm adapter
• Audio cables
• Ground wire
• Power cord
• Electrical fuse

IMPORTANT NOTES

Protect your turntable from excessive heat and humidity. Install it in a manner that ensures the free convection of air through the ventilating louvers. There are no user-serviceable parts inside the equipment, however, should it become necessary to open the turntable, it must first be disconnected from the electrical current supply. Be sure to connect the unit to AC (50 … 60 Hz) main supplies only. For operation on different supply voltages, a wire jumper on the power transformer has to be resoldered to cover the nominal voltages of 100/110/120 V or 200/220/240 V.

WARRANTY

• For equipment purchased in Belgium, the
• Federal Republic of Germany, Austria and
• France a special warranty application card is either contained in a plastic envelope attached to the outside of the packing carton· or is enclosed with the equipment. If this card is missing, please request it from your dealer.
• Complete the warranty application and return it to your national distributor who will then send you your warranty card. For equipment purchased in Switzerland, the warranty responsibility rests with your dealer.
• Please note that the warranty is not valid outside the country of purchase.
• The warranty will be invalidated if the unit is tampered with or serviced by authorized personnel.

PACKING MATERIAL

Do not destroy the original packing. If you ever have to transport your equipment, this special packing will provide the best possible protection for your valuable turntable.

OPERATING CONTROLS

OPERATING CONTROLS AND ELECTRICAL CONNECTIONS

• Push button POWER
  By pressing this push button, the electric current supply is switched on. The pilot light POWER becomes luminous. By pressing this push-button a second time, the electric current supply will be switched off again.

• Push button “33”
  The operation of this button selects the quartz-referenced platter speed of 33.33 rpm. The Light Emitting Diode (LED) above this button becomes luminous when the platter has reached its nominal speed.

• Push button “45”
  The operation of this button selects the quartz-referenced platter speed of 45.00 rpm The LED above this button becomes luminous when the platter has reached its nominal speed.

• Push button ◄ inward
  By pressing this button, the movement of the cartridge towards the center of the turntable is effected, provided the arm support is swung into its operating position. A slow movement is effected by just tapping the button, continuous pressing will result in rapid movement.

• Push button lowering/ lifting
  The operation of this button enables the lowering or lifting of the cartridge at any desired point of a record.

• Push button ► outward
  By pressing this button, the movement of the cartridge towards the rim of the turntable is effected, provided the arm support is swung into its operating position. A slow movement is effected by just tapping the button, continuous pressing will result in rapid movement.

• Linatrack® tone arm support
  Turn the swiveled tone arm support over the disk on the platter. Located underneath the cover of the tone arm support is the just 1½ inch (40 mm) long linear tracking tone arm.

• 45-rpm adapter
  This adapter is provided for the playing of 45 rpm records (singles) with a large center hole.

• Audio cables
  The cables are equipped with phono plugs for connecting to the phono input of the amplifier. The plugs are marked with “L” for the left channel and “R” for the right channel.

• Ground wire Power cord
  Pick-up cartridge in the linear tracking tone arm The cartridge is factory adjusted. If you intend to install another cartridge, enquire at your dealer about the availability of the required installation kit.

• Stylus brush
  Wipes off dust particles from the stylus when swivelling the arm support into the operating position.

• Electrical fuse
  100.120 V: 0,4 AT slow-blow 200 … 240 V: 0,2 AT slow-blow

PUTTING THE TURNTABLE INTO OPERATION

• Audio connections

  • Connect the audio cables to the phono input of your amplifier /receiver.
  • L = left channel
  • R = right channel

• Ground wire

  • To avoid hum interference, connect the ground wire to the ground terminal (screw) on your amplifier/receiver

• Power cord
  Connect the power cord to the AC power outlet.

• Switching on
  Press the button POWER to switch the turntable on.

• Swivelled tone arm support
  In its rest position, the swiveled tone arm supports points forward; it is swung away from the platter In this position the tone arm controls are ineffective.

• Switching off
  To switch off the turntable, press the button POWER.

OPERATION

Playing a 33-rpm record
Place the record onto the platter and press the button “33”. Swivel the tone arm support over the record until it locks into a detent. The stylus illumination will thus be switched on automatically and the platter begins to rotate. As soon as the platter has reached nominal speed the LED 33 becomes luminous.

Press button lowering. The tone arm lowers itself onto the record and the stylus illumination is switched off automatically.
Playing a 45-rpm record
If the record possesses a large center hole, first place the adapter and then the record onto the platter. Swivel the arm support over the record until it locks and press the button “45”.

Press the button ◄ (inward) and keep it depressed until the tone arm has been transported over the record’s run-in groove. Press the button (lowering). At the end of the record, the arm will lift and return automatically to its start position.

GENERAL

Tonearm control
When the tonearm has reached the end of a record (runout groove) it gets transported automatically to its start position. This sequence may be interrupted by pressing the button ◄. The buttons ◄ and ► may be pressed at any time, even in the midst of playing. They affect the automatic lifting of the arm followed by its transportation in the desired direction.
Automatic control functions
When reaching a record’s run-out groove or when swiveling the tone arm support away from a playing record, lifting of the tone arm is effected and this is followed immediately by its return to the start position. After the tone arm has arrived at its start position the platter motor becomes switched off. By pushing the button playing can be initiated again at any time. The design of the tonearm and the floating chassis is highly insensitive to vibrations and mechanical shocks.

Tracking force/limit of vertical movement
Tracking force is optimized by factory adjustment (screw CD). Vertical movement is also limited by factory adjustment (screw@). The stylus can not touch the rubber mat. Should adjustments become necessary follow the instructions supplied with the REVOX installation kit.
Removal of cover from the arm support
To remove the cover from the arm support, first transport the cartridge to a halfway position then switch off the electric current supply. Swivel the arm- support away from the platter to its rest position. Reach under the sides of the cover and while gently pulling the sides outwards lift the cover away from the arm-support.

Stylus replacement
First, remove the cover from the arm support. With the thumb and index finger of one hand take a firm grip on the black part of the cartridge and carefully pull off the stylus unit with your other hand. When inserting the new stylus unit hold the black part of the cartridge firmly while carefully pushing the stylus unit into place.
Replacing a blown fuse
To replace the fuse, the turntable must first be disconnected from the electric current outlet. Next, lift off the platter from the drive motor and tighten the three transport locking screws. Lift the complete turntable on one side to make it stand on the opposite side. Unscrew the fuse cap and replace the defective fuse. The required fuse ratings are listed in the technical data section. After the replacement of the fuse, proceed in the reversed order of the steps described above to make the unit operational again.

TECHNICAL DATA

• Turntable drive: Quartz referenced direct drive
• Turntable speeds: 33.33 and 45.00 rpm
• Speed accuracy: 0.01%
• Platter (Turntable proper): Diameter 12.32 inches (313 mm)
• Weight (Mass): 4 lbs. 10 oz. (2.1 kg)
• Run-up time: better than 2 seconds at 33.33 rpm
• Braking time: better than 2 seconds from 45 to 33.33 pm
• Wow and flutter weighted: better than 0.05%
• linear: better than 0.1 %
• Rumble to signal ratios: better than 48 dB (DIN 45539 A weighting) better than 50 dB (DIN 45539-A weighting plus 20 Hz high pass) better than 70 dB (DIN 45539 B)
• Tonearm: linear tracking tone arm with servo-electronic follow-up control
• Lateral tracking angle error: less than 0.5°
• Skating compensation: not required with a linear tracking system
• Tracking force: adjustable from 8 … 20 mN (0.8 2 g)
• Tonearm lowering: electronically controlled,
• Muting: electronically muted until the stylus has contacted the disc
• Tonearm follow-up: Opto-electronic sensing with LED as light source, servo
• Run-out switch: Automatically activated via servo-electronics

Automatic functions:

• Swivelling the tone arm support in: turntable starts to rotate at the selected speed
• Swivelling the tone arm support out:
  • a) immediate lifting of the cartridge
  • b) tone arm returns to the start position
  • c) turntable stops, stylus illumination switched off
• Phono cartridge: REVOX P20 MOR
• Frequency response: 20 Hz … 20 kHz +3/-1 dB
• Channel balance (1 kHz): better than 2 dB
• Channel, separation: better than 25 dB at 1 kHz
• Compliance: 40 μm/mN (static value at recommended tracking force)
• Trackability (at 300 Hz): better than 85 μm at 12.0 mN (1.2 grams)
• Recommended tracking force: 12,0 mN (1.2 grams), factory set
• Stylus tip radius: 5 x 18 μm elliptical, nude diamond
• Signal-to-noise ratio: better than 65 dB
• Recommended load: 47 ohms/470 pf (220 pf already in cable)

Operating controls:

• TurntabledrivB: 2 tactile feedback keys for 33.33 and 45 rpm, 1 power switch
• Tonearm: 3 tactile feedback keys for fast inward or outward movement plus lowering and lifting of the pick-up cartridge; built-in stylus illumination.
• Components list: 21 [C’s, 19 transistors, 29 diodes, 4 LEDs, 2 bridge type rectifiers
• Electric current supply (solder connections): 100/710/120 V + 10%, 200/220/240 V + 70% 50 60 Hz
• Main fuse: 100 … 120 V 04 A slow-blow 200 … 240 V 0.2 A slow-blow
• Weight: 20 lbs. 1 oz (91 kg)
• Dimensions (WxH xD): 17.7x56x15.6 inches
• Dust cover closed: (449x142x395 mm)
• Oust cover open: height 734 inches (340 mm)

Measured with IEEE 193-1971 weighting and an optimally centered, direct cut lacquer, L + R all rumble measurements were taken in position “mono” with a statically discharged disc and the “new” RIAA reproduce equalization.

THE REVOX PRODUCT RANGE

• REVOX offers a complete range of hi-fi systems Ask your dealer for the REVOX full-line catalog. components. They may be used together with your model B795 turntable in any desired combination:
• REVOX B77 tape-recorder
• REVOX B750 integrated amplifier
• REVOX B760 digital synthesizer FM
• REVOX B780 microprocessor synthesizer
• FM receiver

CONTACT

• Manufacturer
  • WILLI STUDER
  • CH-8105 Regensdorf/Switzerland
  • Althardstrasse 30
  • WILLI STUDER GmbH
  • D-7827 Löffingen/Germany
  • Talstrasse 7
• Worldwide Distribution
  • REVOX ELA AG
  • CH-8105 Regensdorf/Switzerland
  • Althardstrasse 146

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