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
========================
Visit my hobby homepage!
http://ludens.cl
========================
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|