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#1
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Pyramid PIO vitamin Q type capacitor
Hi,
I have a 0.47uF Pyramid PIO vit. Q type caps but with one loosed lead which connect to the aluminium casing. I have tried to solder the lead back but what happen is there are some oil flowing out and become wax once the solder cold down. After testing the cap with a digital multimeter, the cap give me 1.14 uF instead 0.47uF. What's going on ? Does the cap spoilt ? Regards! ADAM |
#2
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"Adam" wrote in message om... Hi, I have a 0.47uF Pyramid PIO vit. Q type caps but with one loosed lead which connect to the aluminium casing. I have tried to solder the lead back but what happen is there are some oil flowing out and become wax once the solder cold down. After testing the cap with a digital multimeter, the cap give me 1.14 uF instead 0.47uF. What's going on ? Does the cap spoilt ? Regards! ADAM Sure is. The thing is, Sprague Vit. Q's have no exposed aluminum case (epoxy or something on both ends with center leads), and ... you can't solder to aluminum - there are all kinds of ways of attaching leads to aluminum cases (of *electrolytic* caps), all of them bein' pretty much mechanical (crimping, spin welding (not true spin welding, more like friction binding), even pseudo - spot welding, but soldering doesn't work. Anyhow, this just a pedantic tangent, since it doesn't apply to the Vit. Q. you've clobbered (if it was a vit Q). If you're doing a slavish resto of a chunk of "vintage" gear, and the rest of the parts are original, I have some .47 Vit. Q's, used, leads ~3/4 inch, and I can send you one for the cost of shipping. Otherwise, I doubt you'll hear any diff. substituting an orange drop. 'luck, -dim |
#3
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I have tried to solder the lead
back You'll need special solder/flux to solder to aluminium! but what happen is there are some oil flowing out and become wax once the solder cold down. After testing the cap with a digital multimeter, the cap give me 1.14 uF instead 0.47uF. What's going on ? Does the cap spoilt ? Yes. Al. |
#4
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Hi,
I doubt very much that is aluminum; more likely tinned brass. But it doesn't matter, as the capacitor is electrically leaky. The leakage is fooling your digital meter into indicating a higher capacitance. In reality, the capacitance hasn't changed. Take a known-good capacitor and measure it while shunting a resistor of several megohms across it, and watch the "capacitance" readout change. As an aside, only Sprague made Vitamin Q caps. Lots of other makers produced metal-cased caps with hermetic glass seals, and some of them were junk. 73, Alan |
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