Forum Replies Created
- AuthorPosts
-
Soundsmith in the USA make hi quality B&O replacement stylus https://www.sound-smith.com/bo-cartridges
For the SP cartridges discussed here, they only offer a rebuild service.
It would be much cheaper to find a good quality stylus on f.e. Ebay and replace it yourself.
For the Beogram 1200 it must be a 15deg tip, like SP6/7/10/12/14 – no SP1/2.Martin
I have the service manual, but many sections are illegible due to shadows/focus problems from whoever scanned the doc. Pgs 2-5, 4-1,7-2, 10-1, 10-2, and the last page diagram of the CD7000
Get the real thing. They are usually neither difficult to find nor expensive, and you can sell it again when repairs are done, if you don’t want to keep it.
Martin
Yes, those bearings.
Not sure if I have a spring.Martin
The bearings from Beoparts-shop does not have the extra flange found in some of these motors, but they work fine nonetheless.
Looks like what was once a white version. Look for a stamped letter on the serial number label.
P=Palisander, T=Teak, E=oak (Eg in danish), H=White (Hvid in danish).Many white Beograms from this time has ended up looking egg-shell or even
light beige from decades of age, sunlight and nicotine.Martin
A red fingerwheel sticks out at the rear of the operating panel – towards the platter, for fine adjustments.
A lit digit is on the panel right above it, indicating its setting. See the user manual.Base adjustments can be accessed through holes the Beograms bottom plate.
Martin
They also restore the electronics, including introduction of a minor modification to the servo motor control circuit.
And they fit a new platter belt. – A quality one.Martin
The speakers in the photos are Beovox C40.
Martin
It’s like that from factory.
It’s timed to run for an adequate time – plus a little – to make sure the drawer closes, even if it should run a little rough.Martin
Did you lubricate using something that evaporates or dries?
Martin
Metal film resistors are neither fusible nor flameproof.
They don’t burn themselves – but they get hot and they burst with a flame.This resistor is a safety component.
If you care about your home and the life and well-being of yourself and the persons living with you, get the real component.
There is a reason flameproof resistors were made and chosen here.Look what damage a flame-proof resistor did to this product.
Imagine anything else fitted in its place…Martin
Check the tracking force dial calibration with a gauge.
It could easily be way off.Martin
Looks like a flame-proof type.
Find the reason it burned and replace with one.Martin
Check the DC voltage to the motor with a scope. Look for correct voltage and amount of ripple.
Martin
Do you have continuity (ohmic resistance) from pin 1 to 3 (speaker disconnected from mains)?
Martin
Missing solder pad at the transformer pin below number 1 in your photo?
Martin
Some electrical appliance nearby? A refrigerator, perhaps at the opposite site of the wall?
Martin
Not sure if I read and understand your post correctly, but if the motors in your Beograms are missing altogether, contact me.
I often have original motors in the dungeons, also restored ones from time to time (coming from products that got scrapped decades ago because they were, for other reasons but indeed(!) beyond repair).
Or ask at Beoparts.The motors used in Beogram 1200 (and motors used in most other Beograms) are perfectly repairable.
Take it apart, clean and lubricate the speed setting mechanism, clean the motor spindle and fit new bearings (Beoparts-shop), and the motor will be back up running as new.
I would prefer that solution to any implant bodge any day. And it will still be perfectly repairable, servicemanual etc. still valid, should the need arise.Yes, power supplies are basically a matter of voltage(s) and current, but also the amount of emitted noise (electrical, physical and electromagnetical) and something as simple as room for mounting (f.e. Beogram 4000).
In Beograms without RIAA or quad-decoder the power supply has no direct influence on the sound reproduction, since there are no electronics in the signal path.
Only the stabile run of the platter and, for tangential decks, the correct controlling of the carriage movement and the tonearm lowering etc. depends on correct power.Are you currently facing a transformer problem?
Martin
Regarding the transformer, it’s simply not possible to make one using an Arduino, a smartphone or a 3D-printer.
Nor is it particularly cheap to have one – or a few – custom produced.
Using a part salvaged from a donor item could be the only feasible way.The same goes, more or less, for a broken plastic part.
Whereas a plastic part may, or may not, be possible to 3D-print, it may, or most likely may not, end up looking as good as an original part, which could be important in some cases.
In any case it would take time measuring, creating a drawing, doing presumably a couple of test-prints and test fittings, to get the part right.
If it’s a part that breaks fairly often from normal use or wear it will, no doubt, be considered for reproduction by Beoparts-shop (listens and takes notes of all requests and inquiries and never 3D-print anything).
If the part was broken by accident, a used original part may also here be the sensible way as seeing other owners in need of one any time soon would be unlikely.Complete reproduced circuit boards are rarely needed for the vintage products.
Practically all of the vintage Bang & Olufsen boards can be repaired at component level, and in most cases even the board
itself can be repaired if needed, and again it would be quite costly to develop and produce just a few.
This certainly would be true for boards in almost any modern product, TVs, active speakers and such.I will not go into discussions about originality, but fitting something “homemade” like f.e. an Arduino in a Beogram would in my
opinion take a lot of the value out of the Beogram.
While the Beogram may end up working for the owner, it may be next to impossible to repair for the next owner or repairshop.
I would hate finding such things inside a Beogram coming in for repairs here, and I would hate having to tell the owner that I cannot help him without fitting back original parts, that would have to come from a scrapped donor.Martin
I understand, but a modern motor won’t last longer than a restored original.
The original motors can be described in two words; Ro Bust.
Bearings run out of oil or dry out. All sinter bearings can and will eventually do that.
A solution to this is readily available for the Beograms in that you can re-infuse
the bearings if they are still structurally good (only few are by now) or you can replace them altogether. They are fairly inexpensive, they come pre-oiled ready to fit, and no
other parts of the motor will be worn or bad in any way (unless mistreated or stored badly,
in which case a lot of others things would presumably need attention too).A modern motor can rarely be serviced. There is not a lot of chance that somebody will reproduce correct bearings, not now and not in fourty years, and most modern motors have wound anchors which in turn means brushes that will wear out and/or break.
The original B&O AC motors are of the one-phase “short-circuit” anchor type.
They have no brushes. Only stationary windings.
They are wonderful motors. Modern stuff is not always better.Regarding Beolab 8000 etc. active speaker standby transformers. Original transformers
may not be available anymore, but I have managed to repair quite a few speakers
using alternative transformers, and I know so have others.
It’s not end of the life for a speaker if the standby transformer dies.The VX5500 breaks a loading gear.
That’s a well-known, almost standard, fault in these machines and, even if I rarely do
TVs and VCRs, I’ve replaced a handful or two of these gears in my time. That’s as common as this is.
The part is (or at least was) available from the drives original manufacturer (Hitachi, if I remember correctly – it has been some time since my last VHS), from where I’ve
bought a few and I wouldn’t be surprised if they can still supply or somebody reproduced the part.Martin
I’m sure it would also be of interest to potential buyers to know where in the world the products are located.
Martin
- AuthorPosts
