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Old 24th December 2006, 09:36 PM   #1
Nordic is offline Nordic  South Africa
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Default killed needle or something else?

Hey, I inadvertantly put +&-12V on the input to my record player when hooking up my newly reassembled and upgraded VSPS, (better decoupling mostly so I can run opa2228 without it going into random oscillation - sounds so much better)... All I get is a loud buzz now, and I don't mean the nice kind. I tested the vsps with mp3 player afterwards, its working fine...

I assume the stylus or cartridge is dead... how do I proceed?
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Old 24th December 2006, 09:57 PM   #2
Zen Mod is offline Zen Mod  Serbia
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looks that you fried coils on cartridge.....checlk with ohmmeter
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Old 24th December 2006, 10:08 PM   #3
Nordic is offline Nordic  South Africa
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for dead short?
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Old 24th December 2006, 10:13 PM   #4
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no, infinite resistance. If it is fried - there is no more continuity.
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Old 30th December 2006, 05:14 PM   #5
bulgin is offline bulgin  South Africa
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Default Killed needle...

Hi Nordic

This is the RSPPC*

*) Royal Society for the Preservation of Phono Cartridges

What type of cart is the problem? MM or MC?

Like ZenMod said - use a multimeter. Set it to continuity and check between the channel pins (White and blue and red and green). If you have continuity, check next between the channels. If you have continuity now, there is a problem. Last check, set to Ohm and repeat the first check, where you should be able to measure resistance.

I add that it is unlikely that you would have fried the cart as I've done this without harm to a mc cart.

bulgin
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Old 30th December 2006, 08:04 PM   #6
Nordic is offline Nordic  South Africa
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Hmmmmmmmm Bulgin, you appear to be right... It measures fine according to your method.

Dang, either way!!!!!!

Think I made a booboo layouing out or populating that pcb, as it is playing very faintly on one channel and hums on the other with the new cartridge. Swapped the cables... signal fine on both channels, except I'm still useless at aligning cratridges etc...

Ai tog.

Now to tempt fate I'm laying out the Graham Maynard vinyl amp from 1975.

http://www.zen22142.zen.co.uk/Circuits/Audio/vinyl.htm

At least in trying to find stuff on google, I found a fix for the unstable speed... simply clean the controler pcb.
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Old 30th December 2006, 08:56 PM   #7
Nordic is offline Nordic  South Africa
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HAHA success... found it... ground lead from one input rca socket came undone.... mp3 player has shared ground, so it didn't show the problem

Will try old cartridge in the morning.

What a good way to end the year. My hifi is sounding better every day.
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Old 31st December 2006, 08:08 AM   #8
Nordic is offline Nordic  South Africa
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Oom B, many thanks, listening to the old cartridge now.... much better than the replacement... but I think it has to do with the allignment etc more... as the channels sounded more uneven on the other cartridge and was lighter in bass response by alot.

Shame about the R300 I wasted.
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Old 31st December 2006, 11:42 AM   #9
bulgin is offline bulgin  South Africa
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Default Killed needle...

Hehe nordic

That's nice!

Hapy New Year

oom bulgin
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Old 31st December 2006, 02:04 PM   #10
Nordic is offline Nordic  South Africa
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http://mkjnovak.homestead.com/files/align.PDF

I found and used this just now...

Does it matter which of the holes I use?

Neither seems to allow for the stylus to follow the line to the centre... or is this just life with a cheap record player?

It does sound remarkably better, I'd love to hear what it would sound like set up properly.
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