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Figure 1: Bryston 2B front view after repairs - photo taken February 2023.
Figure 2: Original power supply capacitors, 6000 uF / 40 VDC - cartridge fuse is on circuit board's right-hand side.
Figure 2: Original power supply capacitors, 6000 uF / 40 VDC - cartridge fuse is on circuit board's right-hand side.
Figure 3: ALS81A 7500uF with threaded mounting stud (left), ALS80A 10000uF plain can type (right).
Figure 4: Left and right channel boards with closed type bias potentiometers installed.
Figure 4: Left and right channel boards with closed type bias potentiometers installed.
Figure 5: Internal view after repairs completed - new MJ 15024/MJ 15025 power transistors on left channel heatsink.
Figure 1: Bryston 3Be front view after repairs - photo taken January 2023
Figure 2: Tantalum capacitors (Left capacitor normal color, Right capacitor discolored/burnt).
Figure 3: Replaced both tantalum capacitors (Blue color).
Figure 4. Original dual capacitors fitted to each channel, RDE 7,500 uF, 63 V (note board markings Dec 91, 3BE-PSB/2.0).
Figure 5. Original RDE with 3 straight leads as fitted (left), replacement CDE having 2 snap-in pins - note larger diameter pins (right).
Figure 6. Two PCB holes drilled out to 2mm (the third hole is now redundant and does not need to be enlarged).
Figure 7. Replacement capacitor mounted.
Figure 8. Installation of jumper wire on the underside of the power supply PCB.
Figure 9. Two tantalum capacitors on either side of the black axial capacitor, closeup of a removed tantalum burnt/leaking.
Figure 9. Two tantalum capacitors on either side of the black axial capacitor, closeup of a removed tantalum burnt/leaking.
Figure 10. Two new tantalum capacitors installed on audio board (installation repeated for other board).
Figure 10. Two new tantalum capacitors installed on audio board (installation repeated for other board).
Figure 1. B739 Tuner Preamplifier partial disassembly.
Figure 2. B739 FM Tuner Preamplifier after restoration, powered up and operating.
Fig 1. AGI Model 511 Preamplifier front view
Fig 2. First step in repairs after replacing fuse holder and power supply capacitors - black axials, left side
Fig 3. Tapered Reamer (model Hozan K-441, suitable for 3~12 mm diameters)
Fig 4. Wiring Diagram for Audio Note 100 K Balance Potentiometer with AGI 511 Preamplifier
Fig 5. Internal view of completed AGI 511
Fig 6. AGI Model 511 Preamplifier rear view with RCA gold plated connectors installed
Fig 7. Older parts removed
Spectral DMC-10 front panel ON
Capacitor Replacement Summary
Power Supply Capacitors
Capacitors Replaced
Parts Replaced
Specifications
Oracle Premiere turntable, Finale tonearm and control unit
Internal view of Control Unit's circuit board showing original components
Internal view of Control Unit after replacing the fuse holder and several of the capacitors
Underside of Control Unit after replacing the fuse holder
Side view of main bearing assembly
Spindle shaft showing a circular wear mark at the lower end
Distance to suspension housings set to 20.7mm
Phasemation PP-2000 Cartridge fitted to Oracle Finale Tonearm
Tonearm wiring resistance measurements
Resistance check of shorted test leads
Overall resistance measurement of Right channel red lead
Red wire's resistance between socket
Red wire's resistance between cartridge socket and RC box
Spectral DMC-10 preamplifier
DMC-10 phono loading rocker switches
Closeup of rocker switch "4" set to 800-ohm
Measured Frequency (3150 Hz conforms to 33 1/3 rpm), Wow & Flutter
Measured Vibration levels
Measured Resonance of Cartridge with Tonearm
Frequency Response test using 800-ohm loading
Frequency Response test using 100-ohm loading
Frequency Response test using 30-ohm loading
Frequency Response test using 10-ohm loading
Initial IMD measurements after adjusting for Azimuth and VTA, before adjusting for Zenith Angle
Initial IMD measurements before adjusting for Zenith Angle
Improved IMD measurements after adjusting for Zenith Angle
Final IMD measurements for Azimuth and VTA after adjusting for Zenith Angle
Channel Balance measurements
Bryston 3Be front view
Suggested hand tools and test equipment for measuring and adjusting DC offset voltage.
Rear of 3Be amplifier
Initial DC offset voltage measurements after restoration and repairs, but before adjustments.
Location of trim pot
Final DC offset voltage measurements after adjustment
Final DC offset voltage after adjustment, left channel
Final DC offset voltage after adjustment, right channel