[Amps] Rectifier equilization?

[Jim W7RY]

I completely agree that 6A10s are real overkill.

73
Jim W7RY


On 9/14/2013 12:14 PM, Manfred Mornhinweg wrote:
> Bill,
>
>> FYI for next time, 6A10 diodes have become preferred by many for high 
>> power
>> use because of their 6 amp continuous and 400 amp surge ratings and 
>> moderate
>> cost. 
>
> I don't mean to say anything against 6A10 diodes, they sure work fine. 
> But they are HUGE overkill. Even if the filter capacitors had zero 
> equivalent series resistance, and the power outlet where the amp is 
> connected had zero impedance, and there were absolutely no inrush 
> limiting system used, and the power were switched on in just the worst 
> possible moment (peak of waveform), just the resistance of the HV 
> transformer will limit the current to roughly 20 to 30A, or maybe 40A 
> if the transformer is really beefy. And such a condition of course 
> doesn't happen in real life - specially the line from which the 
> amplifier is powered does have some resistance and also some 
> inductance. In practical use, in a normal home, it would be really 
> rare to see more than 15A inrush current.
>
> 1N5408 diode has a 200A surge rating, which is still big overkill. The 
> humble 1N4007 with its 30A surge rating would be about the right part 
> to choose for a cost-conscious builder! It's also comfortable with the 
> average current. Rated at 1 ampere average, a bridge rectifier using 
> strings of 1N4007 diodes is good for 2 amperes. That gives enough 
> headroom for a legal limit amp.
>
> Feel free, of course, to use big diodes, if it gives you peace of 
> mind. But it shouldn't be technically necessary.
>
>
> Jim,
>
>> ##  Both my 1N5408 and 6A10  diodes have identical lead diameters.
>
> So do mine.
>
>> Both are I think,   .050 
>
> Yes.
>
> Manfred
>
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