Dillen
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The record/playback relay should only draw when record is pressed.
Do the VU-meters react while playing a tape?Martin
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
“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
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
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
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
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
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
What other speakers did you compare to?
Did you replace the capacitors or are the still the original?
Martin
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
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
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
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 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
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
