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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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In Reply to: ATTN: Paul Joppa, Paramour question. posted by VoltSecond on December 24, 2000 at 18:42:36:
The Paramour transformer is specified by the manufacturer at exactly what we requested, 55mA current draw when using silicon rectifiers into a "large" capacitance. Comparing it to other available transformers of similar specification, the regulation is slightly better and it should run slightly cooler in normal operation. I'm very glad of this, since such transformers usually run pretty hot, but frankly if we could have gotten a cheaper transformer and thereby lowered the cost of the Paramour, we would have done so! It is built on the thinnest lamination stack for which bobbins are readily available, using laminations the same size as the PGP8.x transformers so that the chassis plate will accomodate upgrades to the other Bottlehead amps.Looking at the classic Schade analysis as summarized in the Radiotron Designers Handbook 4th edition (RDH4), the rms current in this case is seen to be essentially independent of capacitance as long as it is greater than 10uF. In other words, during the short time that the capacitor is being charged, the capacitor impedance is much smaller than the winding resistance which provides the only limitation to the charging current. Therefor I believe you can use any value of capacitor in this position. The peak inrush current when first turned on will be the same but will last longer with a larger capacitor. That is still a fraction of a second unless you are using really huge capacitors, over 1000uF.
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Follow Ups
- Re: ATTN: Paul Joppa, Paramour question. - Paul Joppa 15:09:49 12/26/00 (0)
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