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Old 22nd Nov 2015, 7:57 pm   #21
RojDW48
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Hello again - I have attached photos of the story so far. The magnet seems to 'wrap around' the coil and I can't see a way of disassembling further without disconnecting the coil as the contacts appear to be riveted to the housing, preventing the magnet/coil assembly from being extracted. Incidentally - I need to learn how to choose a scale! The resistance of the coil is 2.2K - Roger
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Old 22nd Nov 2015, 8:00 pm   #22
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Yes, the red rubber bit is rock hard.
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Old 23rd Nov 2015, 3:31 am   #23
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

That just looks like a piece of rubber tubing that has been flattened and laid in the slot.

You probably could replace it with fuel line as used in small engines. Available from The Usual Places online.
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Old 23rd Nov 2015, 10:28 am   #24
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

The two parts with screw holes in them form the pivot for the needle holder/armature. They may be held in place by screws from underneath but are not riveted. They are probably just stuck due to solidified rubber on the pivots. You will need to get it apart to replace the rubber on the pivots.

That red bit of rubber is original and does seem to be a bit of flattened pipe. Any sort of soft rubber will suffice to replace it but the harder the rubber the less movement and hence sound output there will be.

The earlier ones have a split in the rubber for the top of the needle carried to poke through, but the later ones are like that with the rubber over the holder.

I will try to post some photographs of a dismantled one later today.
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Old 23rd Nov 2015, 7:01 pm   #25
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Thanks Paul - I am struggling with how it all comes apart!
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Old 23rd Nov 2015, 8:05 pm   #26
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Right, here are some photos of a similar one in various states of disassembly.

The coil tends to stick to the metal part that holds them and the magnet. The rubber on the pivots also tends to stick the two parts together. It takes a bit of judicial force to get them apart, but it is easy to jerk the coil as they release and snap the connections. I have done this a couple of times and have been able to resolder them.

Paul
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Old 23rd Nov 2015, 8:51 pm   #27
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

PS to my last post. The contacts are fixed to the head and the coil is soldered to them but you can still get everything apart leaving the coil in place (unless you snap the leads of course!). I would not attempt to remove the coil.

Paul
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Old 24th Nov 2015, 12:12 am   #28
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

That is really helpful - I shall summon up the courage to have a go tomorrow - many thanks

Roger
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Old 24th Nov 2015, 2:40 pm   #29
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Hi Guys

In reply to the post by PaulR, the white silicone tubing, which I used, has an internal diameter of 2.10 mm and an external diameter of 4.00 mm.

I don't know where it came from - I just collect useful bits of tubing and add them to the tool box. I've got about 40 cm left and would be quite happy to send RojDW48 some if you still need some.

Best regards

Dave
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Old 24th Nov 2015, 3:04 pm   #30
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Thanks Dave.

You can get silicone tubing with a 2mm internal diameter on eBay which could be OK. I will probably never do another of these but there again you do see some nice old radiograms for sale!

PauL
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Old 24th Nov 2015, 8:26 pm   #31
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Quote:
Originally Posted by RojDW48 View Post
Incidentally - I need to learn how to choose a scale! The resistance of the coil is 2.2K - Roger
I'm saying nothing

So now we've established that the coil looks to be fine (I notice that the partial remains of the resistance is actually printed on the one shown in your photo and could possibly be read if viewed in a certain light), it looks like it just need careful replacement of the rubber parts. With that original rubber being as solid as you say, then that will be a good enough reason for no output. Playing a record with it being that rigid will be like using a chisel on the poor old thing!

It looks like you're on the home run with it now, so just take your time and be very careful and it should be fine.
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Old 26th Nov 2015, 12:10 am   #32
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

I had a go tonight and, thanks to Paul's excellent photos, I think I can see what to do but those coil contacts are definitely connected (riveted?) to the external housing and that little contact plate won't come away. Unless someone can come up with a magic solution I guess I am going to have to unsolder them?
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Old 26th Nov 2015, 11:53 am   #33
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

It's a bit of a judgement call. I managed to get a very similar one apart without unsoldering the coil. There again if you can unsolder it and be fairly sure you can reconnect it, that may be the best way forward.

Can you mobilise the two metal side parts from the base? If so you could try carefully to release the coil from them by prising them carefully off using a screwdriver between the sides of the coil and the metal parts. It is rather a fraught process as everything has been in the same position for so long and the solidified rubber on the pivots holds everything together. The coil also tends to stick to the metal parts. There isn't an easy answer but, touch wood, it has worked for me.
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Old 26th Nov 2015, 5:59 pm   #34
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Success! The Mem Sahib had me trying to repair Xmas lights wired in series (the electronic equivalent of banging your head against a brick wall) so I turned to the old Garrard for light relief. The sides and the back seem to be magnets and they pulled away, leaving enough space to manipulate the coil and release the stylus assembly. Thanks Paul. May I take you up on your offer of the sheet? and I shall also see if I can take advantage of the offer of pipe elsewhere. Everything seems to be intact - I hope I can keep it that way on re-assembly.
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Old 26th Nov 2015, 7:43 pm   #35
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Well done! if you PM me your address I will send some rubber sheet.

Paul
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Old 26th Nov 2015, 7:48 pm   #36
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Just a thought - silicon tube could be a stripped covering from silicon covered cable. It's very flexible.
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Old 26th Nov 2015, 9:13 pm   #37
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Good idea!
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Old 5th Dec 2015, 1:24 am   #38
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Success! I re-built it with sheet from Paul and earthing sleeve, which had the right external diameter but it was a bit thin. I also discovered a dead short in the arm wiring, so replaced that and I had to bridge the ground connection at the head to the other end of the coil. Not perfect ( a bit distorted in the mid-range) but definitely working - surprisingly high output! I suspect the distortion might arise from the relatively loose contact with the sleeve? Dave, I'll take some measurements and I might take up your offer of silicon sleeving. Many thanks to all - especially Paul R - Roger.
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Old 5th Dec 2015, 11:31 am   #39
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Hi RojDW48
If you could let me know the length of silicone tubing you need, together with your postal address, I'll do the necessary FOC.
Best regards
Dave
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Old 5th Dec 2015, 3:36 pm   #40
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Default Re: Margolin Plus a Gram (Garrard) continuity but no music.

Hi again RojDW48

I should have said PM me with your postal address

Best regards

Dave
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