[Amps] Rectifier equilization?

[Carl]

I wouldnt use MOV's on the primary either, show me a reputable manufacturer 
that does.
The problem with MOV's is they have a narrow current range where they are 
most efficient and either side of that the internal resistance and heat goes 
up. They also have a finite life.

Carl
KM1H


----- Original Message ----- 
From: "Hardy Landskov" <n7rt at cox.net>
To: "Manfred Mornhinweg" <manfred at ludens.cl>; <amps at contesting.com>
Sent: Saturday, September 14, 2013 3:39 PM
Subject: Re: [Amps] Rectifier equilization?


> Hi All,
> Well everyone is certainly getting the mileage out of my original post, 
> but I really want to thank everyone who responded. The concensus is just 
> go with the 5408's and everything should be fine. But use MOV's on the 
> primary and a good, HV bypass cap on the output as well as good 0.01's on 
> the power cord. And a step start of course.
> 73 Hardy N7RT
>
> ----- Original Message ----- 
> From: "Manfred Mornhinweg" <manfred at ludens.cl>
> To: <amps at contesting.com>
> Sent: Saturday, September 14, 2013 12:14 PM
> Subject: Re: [Amps] Rectifier equilization?
>
>
>> 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
>>
>> ========================
>> Visit my hobby homepage!
>> http://ludens.cl
>> ========================
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>
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