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