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Dillen

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Viewing 20 posts - 481 through 500 (of 718 total)
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  • in reply to: Beogram 5500 LH channel not working #46333
    Dillen
    Moderator

    You could try setting the tracking force very low (0.2-0.3g) and see what happens.
    The needle may not track correctly, and it may jump around a bit, but it would also
    merely be to test if sound is produced from both channels.

    Another test could be to take off the cartridge and put it aside, start the Beogram (play)
    without it and while it is “playing”, insert a small strand of copper wire into
    the cartridge socket, one hole at a time, listening for a healthy buzz from the amp/speakers.
    The L+ and R+ socket pins respectively, should give that if the deck, leads, amplifier and speakers are fine.

    Martin

    in reply to: Beocord 5000 Type 49xx no sound #46505
    Dillen
    Moderator

    The record/playback relay should only draw when record is pressed.
    Do the VU-meters react while playing a tape?

    Martin

    in reply to: Bad smelling cabinet damping S45-2 material! #46367
    Dillen
    Moderator

    The smell is caused by airs moisture (most often down to bad storage).
    The smell will never go away again, even if vented thoroughly and kept completely dry for years.

    If it doesn’t smell when the speaker is closed, you may want to just leave it alone.
    But if it smells “out” of the speaker, it will be annoying, and the solution is to remove it all, clean the cabinet inside using a disinfectant/smell remover (as the smell will also be in the wood) and put in new damping material.

    Martin

    in reply to: Beogram 5500 LH channel not working #46330
    Dillen
    Moderator

    “Martin, I agree but the diagram is still wrong as a single pin cannot have 1480 and .2 ohms. It would be 1480 and 740 ohms.”

    When muted all pins are connected. That’s where the 0,2-0,3 Ohms come in.
    When unmuted, the L- and R- are still connected (signal ground), so when measuring between L+ and R+ you are measuring the two coils in series.
    Their common center connection to ground doesn’t matter, seeing as you are not measuring with respect to ground.

    OP: Any access to another Beogram to test the suspect cartridge with?
    Where are you based?

    Martin

    in reply to: Beogram 5500 LH channel not working #46326
    Dillen
    Moderator

    Do you have access to another cartridge for testing?

    Martin

    in reply to: Beogram 5500 LH channel not working #46324
    Dillen
    Moderator

    Those do not look right. Measure the cartridge pins when it’s not installed. The pins are looking from the back: L+. R+ L- R- The 740 ohms should exist between L+ to L- and R+ to R-. There should be no resistance between R+ and L+.

    Unmuted; When the cartridge is fitted to the arm, the two coils have their respective negative ends connected to signal ground.
    This means that if you measure from L+ to R+, you measure the two coils in series (2x 740 = 1480).
    All fine.

    Muted; All cartridge pins are connected to signal ground.
    All fine.

    Martin

    in reply to: Beogram 5500 LH channel not working #46322
    Dillen
    Moderator

    All fine so far.
    The fact that you actually have sound from the affected channel, even if only briefly, suggests that the wiring is fine.
    The problem could be with the cartridge itself.
    I have seen cases where sound is lost when the needle is on a record.
    Perhaps a dying cantilever suspension.
    Do you have access to another cartridge for testing?

    Martin

    in reply to: Beogram 5000 #46219
    Dillen
    Moderator

    It has been a while since the last Beogram 5000 on the bench, but I seem to remember
    when you lift off the dustcover hinge block, a small connector becomes visible.

    Martin

    in reply to: Beomaster 4400 faulty issue #46291
    Dillen
    Moderator

    Cracked solder joints near the relay?

    Martin

    in reply to: Beomaster 5500 capacitors dying? #46126
    Dillen
    Moderator

    Firstly, would I be right that the power relay is by the large transformers, and the muting relay is close to the speaker outputs?

    Yes.

    (See attached image). I have never got involved with such transformers – might I ask for a bit more detail for “cleaning the contacts” and a view on the resistances shown attached. Some of them are very approximate as they were slowly falling during my measuring them.

    Replace the relay. Cleaning will not be a long lasting solution.

    I have not yet removed the transformer…

    You don’t have to.

    Martin

    in reply to: Modding B&O speakers? #46136
    Dillen
    Moderator

    So, basically, you are comparing a 45 year old speaker still running on its original
    capacitors that, ideally, should’ve been replaced 20 years ago, to two speaker models
    that are currently available new in shops – and you find them lacking a little treble?

    Well… replace the capacitors to grant it just a hint of fairness.
    Kits are readily available.

    Beovox S45-2 is an incredibly well balanced and sounding speaker, but it is not “audiophile” and will never be.
    Keep in mind it was merely somewhere in the middle of the Beovox model range at the time.

    Martin

    in reply to: Repairs to valve radio, help needed #46118
    Dillen
    Moderator

    MINI 41K? – Are you sure?

    Martin

    in reply to: Modding B&O speakers? #46133
    Dillen
    Moderator

    What other speakers did you compare to?

    Did you replace the capacitors or are the still the original?

    Martin

    in reply to: Beomaster 5500 capacitors dying? #46124
    Dillen
    Moderator

    I agree on the cleaning. A piece of paper soaked in contact cleaner pulled through the contacts – nothing more, or the very delicate platinum coating on the relay contacts will be damaged.
    – And you may find that oxidation from airs moisture already did just that.
    So – replace the relay.

    Martin

    in reply to: Modding B&O speakers? #46129
    Dillen
    Moderator

    Anyone ever thought -or tried out modding any of their speakers? I have these Beovox S45-2 ones and I do like the imaging but feel like the tweeter driver could be replaced with a better one.

    Why?

    Martin

    in reply to: Beocenter 3300 switchbank disassembly? #46049
    Dillen
    Moderator

    They are interchangeable.
    But if yours is the version with the white “see-saw”-arm between the switch rows, check that it doesn’t bind.
    Else – give it a good dose of contact cleaner to shift any dry lubricants in the release mech.

    Martin

    in reply to: Beocenter 3300 switchbank disassembly? #46047
    Dillen
    Moderator

    Two different switch banks can be found in Beocenter 3300.
    One cannot be easily diassembled – and it’s usually not necessary. Most will respond well to a shot of contact cleaner and a little exercise.

    Martin

    in reply to: Beogram 6500 only one channel working #46044
    Dillen
    Moderator

    In Beogram 6500 muting is not done by a relay but by a mechanically operated switch.
    This switch does not break the signal paths, – it grounds them. This means, that a bad contact won’t cause silence but instead the muting will fail and sound will be audible when the needle lands on the record and lifts again.

    If you are sure, your amplifier is good, I agree on:
    – Cartridge
    – DIN solders
    – Broken tonearm wiring inside carriage housing
    – Bad RIAA connection inside the Beogram
    – Faulty RIAA
    in that order.

    Martin

    in reply to: Beogram 1102 mechanism #46013
    Dillen
    Moderator

    The white head of this arm should be on the other side of the cam wheel, operated by it.
    Its head should be riding against a teflon sheet with a thick metal backing plate found under the platter.

    Take off the cam wheel, the metal plate with teflon backing and fit the arm correctly so that
    it swings the tonearm when the cam wheel rotates, dampened to a smooth travel by the spring loaded teflon sheet.

    Martin

    in reply to: Beogram 4002 No sound at all #45947
    Dillen
    Moderator

    The solenoid should NOT be lubricated.

    Martin

Viewing 20 posts - 481 through 500 (of 718 total)