Yes, Hardy, that's the way I would go. Except being a Brit, I'd spell it
"equalisation"!
73
Peter G3RZP
========================================
Message Received: Sep 14 2013, 08:40 PM
From: "Hardy Landskov" <n7rt@cox.net>
To: "Manfred Mornhinweg" <manfred@ludens.cl>, amps@contesting.com
Cc:
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@ludens.cl>
To: <amps@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
>
> ========================
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> http://ludens.cl
> ========================
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