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Old 18th June 2011, 03:17 PM   #6501
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Infact, I dont think the cartridge from Merlin is in big danger also it would be worth to remove this parts.

It is important to be aware of this possible problem, specially when
removing the transparent protection sheet.

Digicams can be very revealing for such things, isnt it?

Franz
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Old 18th June 2011, 04:15 PM   #6502
RCruz is offline RCruz  Switzerland
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Another important remark.... Never work with iron tools near the cartridge because MCs have very powefull magnets that can pull a screwdriver with tremendous force.
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Old 18th June 2011, 04:20 PM   #6503
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Quote:
Originally Posted by AndrewT View Post
Copydex is a liquid.
It seeps in around the debris and surrounds it. That makes it easy to remove the debris, as the skin of partially set rubber film is peeled out. It does no harm to leave it a bit longer until all the film has set to clear, about 5 to 15minutes if thin enough and approaching 30minutes if you apply a big glob.
Blue tac is a solid and will not flow around (no capillary action). It also does not peel well and tends to leave some blue tac behind which will be difficult to ensure 100% of the blue tac. You still have the problem of the debris lying in the gaps that the blue tac has not surrounded.
Please AndrewT could you buy for me the Copydex? I can't buy here in Spain.

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Originally Posted by Franz Gysi View Post
Infact, I dont think the cartridge from Merlin is in big danger also it would be worth to remove this parts.

It is important to be aware of this possible problem, specially when
removing the transparent protection sheet.

Digicams can be very revealing for such things, isnt it?

Franz
Still not removed the transparent protection, it's necessary to remove?
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Old 18th June 2011, 04:23 PM   #6504
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So you clearly hear differences just by adding 18p in C3
Yes I hear differences adding 18pF in C3 also I hear differences adding 4.7pF in C2, now sounds better with 18pF more but seems there is more room to add other 15 or 18pF I will keep informed

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Another important remark.... Never work with iron tools near the cartridge because MCs have very powefull magnets that can pull a screwdriver with tremendous force.
Very very good advice, it's a easy way to damage the cartridge.

Last edited by merlin el mago; 18th June 2011 at 04:25 PM.
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Old 18th June 2011, 04:35 PM   #6505
AndrewT is offline AndrewT  Scotland
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Please AndrewT could you buy for me the Copydex? I can't buy here in Spain.
I have not tried it, but I wonder if anyone has experience of using rubber solution as in repairing punctures in bicycle tyre tubes could be used instead.
This has more STICK than Copydex and may have more aggressive chemicals that might have an effect on plastic parts.

Codydex is relatively non aggressive and has low tac.

What are the rules about posting a container of liquid in the EC?
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Old 18th June 2011, 05:48 PM   #6506
Salas is offline Salas  Greece
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That source on Ebay notes worldwide shipping. Copydex 125ml. This cheaper post cost one excludes only Canada and Italy. Copydex.
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Old 18th June 2011, 06:13 PM   #6507
RCruz is offline RCruz  Switzerland
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Hi Merlin

If you go away from 47n + 10pF for C2 you will not have a correct 500.5Hz mid freq point for the riaa.

Remenber that you have R4 = 6764 so 6764 x 0.04701 = 318uS (500.5Hz)
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Old 18th June 2011, 08:14 PM   #6508
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That source on Ebay notes worldwide shipping. Copydex 125ml. This cheaper post cost one excludes only Canada and Italy. Copydex.
Hey Nick thanks for the links.

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Hi Merlin

If you go away from 47n + 10pF for C2 you will not have a correct 500.5Hz mid freq point for the riaa.

Remenber that you have R4 = 6764 so 6764 x 0.04701 = 318uS (500.5Hz)
Possible I have a little bit more than 47nF & sounds better than adding more capacitance.

Definitive now C3 needs more capacitance, I will try tomorrow.
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Old 19th June 2011, 09:43 AM   #6509
AndrewT is offline AndrewT  Scotland
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Originally Posted by merlin el mago View Post
Possible I have a little bit more than 47nF & sounds better than adding more capacitance
if 47nF is >47n01F then the whole RIAA circuit components must be scaled to match the erroneous value used instead of 47n01F
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Old 19th June 2011, 10:35 AM   #6510
RCruz is offline RCruz  Switzerland
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As we depend on the DMM to determine caps values, there is always the possibility of an error.... experimentation is a must but we must not deviate too much from the calculated values
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