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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: This might explain why your buyer claimed what he did. posted by Raiderman on May 5, 2007 at 07:35:44:
"About half way down the article, there is a dire warning about this cartridge and which phono preamps can safely be used with it."The paragraph you pointed to states:
And now for a dire word of warning: your phono stage may well be an Allaerts killer. All of them from the MC1B up have incredibly thin coils. If there is any DC kickback in your phono stage or other funny stuff, it will melt the coils and you are looking at a seriously expensive rebuild. Melt the coils? Yes. They are 20 micron thick pure 24 carat gold. I wouldn't even hold them too close to a hot lamp.
That's a new one..... I was never given such warning from anyone, and never had any problem like that with any other cartridge, with the BRB preamp that I was using for a long-time reference. (The BRB later got knocked off by the Don Allen phono stage with Bogen step-up transformers.)
Besides, the BRB pre's "open" input impedance is 47,000 ohms, and is capacitor coupled. As is the case with most active phono stages. It was shunted by a resistor of several hundred ohms. That alone would have made DC offset taking out a coil very unlikely. The only way this would occur is if the pre's "open" input impedance was relatively low and the input was DC coupled.
Another curious aspect of this is that "thin" coils would result in a higher source impedance, and would likely require a higher input impedance to interface with. The load recommendation for that cartridge was typical for what's recommended for a low-output MC cartridge- 100 ohms. I ultimately ran it at 220 or 330 ohms. (The cartridge I had used silver coils.)
The most-common cause of coil failure in cartridges is electrostatic discharge (ESD) during handling and installation. And one should take the necessary precautions whenever handling a low-output MC cartridge. I always "ground" myself before handling any ESD-sensitive device.
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Follow Ups
- That's a New One....... - Todd Krieger 14:22:34 05/05/07 (1)
- Re: That's a New One....... - throwback 19:50:31 05/09/07 (0)
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