While on the subject of the 6A10 ...
Some months ago I discovered a data sheet for the 6A10 that
had a 100 Volt PIV (yes, 2 zeros). I posted the link here at that
time.
So, some caution here is warranted. Make sure you get the right
ones.
73, Dick, W1KSZ
On Sun, Sep 15, 2013 at 8:16 AM, Paul Christensen <w9ac@arrl.net> wrote:
>
> > As a data point, ETO used a quad set of Semtech SCH5000 "SlimPac" diodes
> in the Alpha 70 and 77 series. These are rated at 5KV but only 500mA of
> continuous current.
> >
> > It may have been a marginal design, but I don't believe there's been a
> really poor history of diode failure in these amps over the years.
> >
> > Paul, W9AC
> >
> > Sent from my iPhone5
> >
> > On Sep 14, 2013, at 9:44 PM, Jim W7RY <w7ry@centurytel.net> wrote:
> >
> >> 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
> >>>
> >>> ========================
> >>> Visit my hobby homepage!
> >>> http://ludens.cl
> >>> ========================
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> >>
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