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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: Interesting as the new thermistors that seem to have corrected the problem have lower resistance at room temp* posted by Norm on March 20, 2012 at 17:09:34:
The initial resistance, if too high, may cause the device to eventually fail. Too low, of course, means that the initial current inrush may be a bit too high for real safety.
The same holds true for fuses. Quicksilver used to use 3.125 amp slow blow fuses, but as they are increasingly harder to source and getting more expensive, they switched to the common 3 amp fuses. They do have a tendency to blow after a certain number of on/off cycles. This may be occurring with the value of the thermister you use.
It is also interesting to note that modern slow blow fuses are not built to withstand a higher inrush current as the older models. The modern fuses have a simple coil of wire around a fiberglass core. The older models are spring loaded with a much more robust fusible link( they actually sound better, BTW). The problem is, while they are still made, the cost is now about $5 a piece and very few brick and mortar supply houses carry them for that reason.
Stu
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- RE: Interesting as the new thermistors that seem to have corrected the problem have lower resistance at room temp* - unclestu 12:36:24 03/23/12 (0)
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