ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Got started on this one
Pics lost because of PHOTOBUCKET
Collecting Vintage B&O is not a hobby, its a lifestyle.
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Top view
Some of the PCBs are easy to get at, but the interconnects are all soldered wires, no jacks or plugs, on my BC 2000 RtoR I could easily take out all the PCBs. In the lower left corner you can see a double lever system for the switches, all of these needs cleaning and lubrication as most of them moves slow and hard.
The ROE caps all looks good, no leaks found until now.
The wood fame is cracked in the back right corner it will need some work, but the rest is OK, the diagram was in the envelope
The whole "joystick" mechanism moves hard and slowly, very old grease and dirt.
The switch assembly, someone put back the Left speaker button upside down
The buttons off on the switches one can see the copper plates that are supposed to sit on the top of the double levers.
As I had to dismantle the joystick mechanism I had to take the slider PCB out I changed the ROE and red drop caps, I may go on and change the black drop transistors too the sliders are a PIB, one cant open them for cleaning.
part of the joystick mech. out
here the parts
Here the tape heads, the record and play head needs some serious work
Now one question, the motor has a very big 130 V 8 uF capacitor, it is attached to some serious anti vibration support it looks OK and I will check it with a meter.
With what can I change it, everything I find in 8 uF is tiny like 10 mm diameter and 20 mm long.
pricey but new stock
I also see them much cheaper in Poly for cieling fans and such 8uf 250V for about $6 if it is a motor cap it might work
While I involved myself in the repair of some B&O equipment (not being succesfull sofar), listening to "vintage" music played back on a BC 1200 (R2R), I came accross this thread.
A couple of weeks ago it all of a sudden stopped playing, whereas Rewind and Fastforward still function as they are supposed to do.😢
I take the opportunity to ask here, in view of the clear pictures, for advise as to what might cause this problem (or should I start a new thread?)
I can get these axial caps from mouser USD 1.50 Vishay but very small to the physical size, as in your link, will a small one like that do.
Aad Jansse: While I involved myself in the repair of some B&O equipment (not being succesfull sofar), listening to "vintage" music played back on a BC 1200 (R2R), I came accross this thread. A couple of weeks ago it all of a sudden stopped playing, whereas Rewind and Fastforward still function as they are supposed to do.😢 I take the opportunity to ask here, in view of the clear pictures, for advise as to what might cause this problem (or should I start a new thread?)
I didnt get that far yet, but if I remember right there are various switches and other components involved in the play circuit, it may be a simple thing, but considering the age of the BC capacitors and some transistors may be in need of renewal. I intend to change all electrolytic and red drop caps some transistors and trimmers where needed. Follow the thread to see what comes out.
Søren Mexico: I can get these axial caps from mouser USD 1.50 Vishay but very small to the physical size, as in your link, will a small one like that do.
Caps have become a lot smaller over the years as we both know. But the real question is it a motor cap or a standard general purpose cap. might make a difference. Possibly a big difference. Is the cap polarized for example.
Ricardo: Søren Mexico: I can get these axial caps from mouser USD 1.50 Vishay but very small to the physical size, as in your link, will a small one like that do. Caps have become a lot smaller over the years as we both know. But the real question is it a motor cap or a standard general purpose cap. might make a difference. Possibly a big difference. Is the cap polarized for example.
Here a pic from the schematic, not polarized, didnt reflect on that just went looking for caps
Søren Mexico: Ricardo: Søren Mexico: I can get these axial caps from mouser USD 1.50 Vishay but very small to the physical size, as in your link, will a small one like that do. Caps have become a lot smaller over the years as we both know. But the real question is it a motor cap or a standard general purpose cap. might make a difference. Possibly a big difference. Is the cap polarized for example. Here a pic from the schematic, not polarized, didnt reflect on that just went looking for caps
I thought it might be bipolar the old Wicon caps usually had a black mark on the negative lead. I am beginning to think along the lines of motor cap. I wonder if the old data sheet is available for that particular cap. be interesting to see what the tolerances ripple current and esr is. Dought it is an oil can but I bet its nothing like an audio cap in its performance.
Søren Mexico:Here a pic from the schematic, not polarized, didnt reflect on that just went looking for caps
I know the feeling, Søren!
Nice to see another project thread with the old, more mechanical based equipment. Makes me want to restore some of my older B&O systems. I'm mostly using my 80s and 90s systems, but could be nice to restore a 60s or 70s B&O system back to it's former glory - there's enough to choose between at least.
Amazing work you did on the 5000s and 4002 btw.!
/Dennis
Your motor cap seems to be marked 130V RMS. So I guess you need to multiply by 1.4 when you select a replacement.
runekock: Your motor cap seems to be marked 130V RMS. So I guess you need to multiply by 1.4 when you select a replacement.
I will desolder it and take a good pic with all the text on it, but I am the opinion that we are dealing with an AC motor cap, aca like a ceiling fan cap
I will follow this thread and meanwhile I'll try to find out what and where to buy for replacement; besides I mentioned the wrong BC model: it is not my 1200 (is still intact), but my 1600 that fell silent, though it should not make a difference provided that the problem is not in the amplifier.
I decided to go on with the mechanics and leave the electronics for later when the mechanical part is nearly finished, this BC 1200 is not made for easy service so use your camera frequently before and while dismantling.
Here today's harvest
All levers and wheel was moving very hard, some levers I had pry off with nearly excessive force, like this one in the pic, totally dry inside, and if not like that then with old very hard grease all over
Nearly all out and ready to clean
I love reels and this is a beauty.
I never seen a beocord... maybe because im new in beo world.
Good luck!
I have four reels: 3 revox (g36,a77, b77) and one tascam 32.
The g36 needs some attention but iam not with time and knowledge... it have a tube pre and power amp on it.
Hi Søren,
All in all, a much simpler deck than the older three-headers.
Not sure whether it will sound worse or not!
Is the replay-record head still good? Not very clear on your photo.
Jacques
chartz: Hi Søren, All in all, a much simpler deck than the older three-headers. Not sure whether it will sound worse or not! Is the replay-record head still good? Not very clear on your photo.
Maybe simpler from function but not easy to service, The replay/record head has some wear but I think I can polish it down to get it even (tape track wear) will show some better pics when it is out.
Cleaning parts, some of them so dirty that I will have to use acetone
After removal of my BC1600 a broken belt immediately attracked the attention, part of the problem solved; next step is to acquire a new belt and then to get this thing d ; consequently I have 2 questions:
1. Where can I obtain this belt
and later:
2 . How to put it in place ( answer can wait)
Hi there ,
I just sent a PM to Martin ordering a belt kit + mounting instructions.
Soon question 2 will be blinking for an answer
I continue my efforts to solve my BC1600 problem via this thread : Martin's answer to my PM included a remark as to a single or twin flywheel; does my picture shows enough detail to distinguish beween a single or twin wheel? If so, I can order the right belt kit. Soren?
I think Martin is asking if the flywheel has 1 or 2 belts, my 1200 has a 2 belt flywheel in your pic it is not to see, so check if there are 1 or 2 belt drives on the flywheel. if I am wrong Martin will correct me soon.
As for belt change, there is a good description of how to in the manual I will start assembling the mechanics, after a little more cleaning, today, I will take a couple of pics of when to attach the belts
As to the flywheel, here's a better pic: clearly (?) a single type
The flywheel is sitting direct on the motor shaft, the pic is from the tape turntable
What I am asking about is : see pic
In the SM there seem to be 2 belts, On my pic of Feb 11 I think one can see only ONE broken belt on the pic.
So what is the difference?
Aad Jansse: In the SM there seem to be 2 belts, On my pic of Feb 11 I think one can see only ONE broken belt on the pic.
Check the brass wheel in the middle, does it have 1 or 2 belt tracks ?, or check the flywheel for 1 or 2 tracks, my BC has 4 belts,
2 for the main drive: from the motor drive bushing (brass wheel in the middle) to the fly wheel
1 from the right tape spool turntable (take up spool) to the counter
1 below the deck from the flywheel assembly to the take up spool assembly
You're up early Soren ! Nice work so far I hope you both get them going again.
Ricardo: You're up early Soren ! Nice work so far I hope you both get them going again.
My nephew woke me up, he was doing a night on the town, bad idea, he got robbed of his wallet, phone in the wallet his IDs and credit cards, needed help. If you want some excitement in your life, come to Mexico
Søren Mexico: Ricardo: You're up early Soren ! Nice work so far I hope you both get them going again. My nephew woke me up, he was doing a night on the town, bad idea, he got robbed of his wallet, phone in the wallet his IDs and credit cards, needed help. If you want some excitement in your life, come to Mexico
To be young and careless - I remember those days well. The drunken nights out in bars and the barrios of Manila and Olongapo City when I was 20 where good enough for me.
The looks of contempt from the local pinoy's was something you don't forget. You really did have to watch your back. We usually travelled in a pack at night.
Ricardo:To be young and careless - I remember those days well. The drunken nights out in bars and the barrios of Manila and Olongapo City when I was 20 where good enough for me.
Long time ago Richard, I have explained my failures to my sons and nephews but they do the same mistakes anyway.
Yesterday I could do a little work on the tapehead, in the pic you see how it is worn more in the lower part.
I took it out and started out polishing with 30 micron sanding sheets, putting more pressure on the upper part and polished until I had it even, the down to 15 micron and in the pic now finished with 9 micron, will go down to 3 micron today. a little time consuming but it works, I did the same on my BC 2000 heads
The brass wheel has 1 belt track, so this should be sufficiënt info to have Martin send me the right belt kit.
Thanks
Seeing all those parts I must understand that you also have overcome the dilemma of searching the floor for the tiny locking springs flown away after me trying to remove them; I do not have enough donor 1600s or 1200s for spare ones: is there a trick to easily avoid this? A special tool perhaps?
Aad Jansse: Seeing all those parts I must understand that you also have overcome the dilemma of searching the floor for the tiny locking springs flown away after me trying to remove them; I do not have enough donor 1600s or 1200s for spare ones: is there a trick to easily avoid this? A special tool perhaps?
I bought these snap ring pliers, they dont fit very small rings, so I filed down the inside of the pliers legs,, that brings the pins that fits into the rings closer together and they then goes for also very small rings