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Mark-sf

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Viewing 20 posts - 41 through 60 (of 347 total)
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  • Mark-sf
    BRONZE Member

    It’s likely a missing diamond or mis-calibrated tracking force. I doubt its a cueing mechanism issue.

    in reply to: Can anyone recommend a tracking force gauge? #58514
    Mark-sf
    BRONZE Member

    You can get that one to work by removing the top platter and belt.

    in reply to: Cleaning Stylus, and cleaning Vinyl? #58375
    Mark-sf
    BRONZE Member

    The proper fluids will not leave a residue especially if you dry them. Just keep the liquid off the labels.

    in reply to: Cleaning Stylus, and cleaning Vinyl? #58288
    Mark-sf
    BRONZE Member

    The sound issues you are describing are not likely due to a dirty stylus or record Bass distortion is more likely to be caused by improper stylus force or a failing stylus cantilever suspension. I would recalibrate your tracking force to 1.2g for your MMC4 and 1.5g for your MMC5 first and then evaluate. As to cleaning the stylus, I prefer the gel-based ones such as from DS Audio as they leave no residue. Finally, a Spin-Clean Record washer will be a significant step up from your brush cleaner

    in reply to: Beogram 4500 CD — heavily distorted sound #57905
    Mark-sf
    BRONZE Member

    Since, you found a shorted cap replaced all of them, it is likely the culprit for the burnt resistor. OpAmps usually work fine or simply fail by their nature.  If the sound is now clean without noise and distortion, I would just button it up and enjoy.

    in reply to: Beogram 4500 CD — heavily distorted sound #57767
    Mark-sf
    BRONZE Member

    If R121 burned, I would replace IC 10 & 11 as they are connected to the same resister. I would also change out C103 & 107 which I believe you are doing.

    in reply to: Beogram 4500 CD — heavily distorted sound #57688
    Mark-sf
    BRONZE Member

    There are actually 2 dual opamps IC10 and 11. You may be referring to the 100 μF caps on the 15v -/+ rails that help smooth the DC. However, their failure, assuming they opened versus shorted, would not cause white noise in my experience. It is also not likely that both channels would fail together since each has its own dual opamp.  If in fact both channels exhibit the same white noise your problem is likely in the 15v dual power supply section.  This regulation was done discretely back then and is where I would start.

    in reply to: Beogram 4500 CD — heavily distorted sound #57675
    Mark-sf
    BRONZE Member

    You haven’t mention what component/system it is connected to. If both channels have the same distortion you may be overdriving the input to your receiver as the diigital side sounds fine and once the signal leaves the DAC chip it flows in discrete L/R circuits which are unlikely to both distort unless you have problems with either the +15v or -15v supplies to their opamps.

    in reply to: Beogram 1000 – Motor issue and technical question #57429
    Mark-sf
    BRONZE Member

    As far as the coils go those readings should be fine. Hope your restoration goes well.

    in reply to: Beogram 6500 with weird behavior – need expert #57376
    Mark-sf
    BRONZE Member

    I don’t see the video; however, you should take a look at the service manual and follow the adjustments in Section 5.1. While doing that take note if it also needs cleaning and lubrication which is covered in 4-8.

    Mark-sf
    BRONZE Member

    You need to use the 120v position AND need to ensure that the fuse in 500mA. If you are unsure of switch end positioning, use an ohm meter between the two AC pins and the 120v one will have about half the resistance of the 240v one.

    in reply to: Beogram 4002 – Power off when not in use? #56444
    Mark-sf
    BRONZE Member

    I would not bother turning it off at the mains daily or even a few days as this stresses components that were intended to have power on continuously such as the those in the power supply. I would only do it for extended vacations of weeks to protect from power surges. Using the 4002/4 models for almost 50 years this way without an issue.

    in reply to: Beogram 400+ control panel refurbishment #56425
    Mark-sf
    BRONZE Member

    Actually the marks are a wearing away of the matte finish. Some have simply removed the finish entirely or you can check out Rudy’s excellent blog entry at https://beolover.blogspot.com/2022/04/beogram-40024004-keypad-restoration.html.

    in reply to: Best vintage amp? #53725
    Mark-sf
    BRONZE Member

    The tweeter section is on one side of the woofer section, so you ca place a stereo pair with them on the inside or outside as they are mirrored. If doubling up I would have each channel in a WTTW configuration and angled at the listener as you’d want to stay on axis.

    in reply to: Tips for adjusting BG4000 platter height #54098
    Mark-sf
    BRONZE Member

    The damping cylinder only slows lowering. Raising should be quick. You can turn it more to slow it further. It simply won’t lower if too much.

    in reply to: Tips for adjusting BG4000 platter height #54096
    Mark-sf
    BRONZE Member

    The screw in the black bottom of the damping cylinder controls the rate of descent.

    in reply to: Tips for adjusting BG4000 platter height #54094
    Mark-sf
    BRONZE Member

    I have seen the braided cable rise up out of the curved channel as approaching the spindle if it is twisted. Also the bearing height is adjustable. The brass bearing is threaded and with a large locking nut on top. However, that rarely ever is the problem.

    in reply to: BeoGram 5005 tonearm too low #53971
    Mark-sf
    BRONZE Member

    I believe that bearing is part of the arm assembly and is not available separately. You will need to replace the entire are or find a parts unit. Most B&O tonearms were a single part number.

    in reply to: BeoGram 5005 tonearm too low #53969
    Mark-sf
    BRONZE Member

    Relooking at it the second pin may be there. However, if you had an issue with the knife-edge bearing B not being there, the arm would not work at all. It’s possible the are was not properly refitted. Try following these steps precisely again:

    IMG_1021

    in reply to: BeoGram 5005 tonearm too low #53967
    Mark-sf
    BRONZE Member

    Your picture of Part 1110, Holder, appears to be missing a rear piece S that sticks up and may have snapped off. The only solution would be to find a replacement.

Viewing 20 posts - 41 through 60 (of 347 total)