http://elecraft.85.s1.nabble.com/Electrolytic-Capacitor-failure-tp7659760p7659798.html
> I have always been taught and thus have a concern when power supplies
> of excessive capacity are used for any type of service. If the wiring,
> in this case, between the power supply and the radio is #12 or #14 of
> any length typically supplied by radio companies, should a short occur
> in the power cable, it is likely the power supply will deliver full
> current. That will quickly melt the insulation on the power cable and
> could cause a fire before the power supply goes into current limit.
>
> Now at the same time, each power cable could be fused at the supply to
> limit the amount of current the supply can drive into the cable. I
> have to say I don't like this idea as the in-line fuse adds a
> significant amount of resistance and will impact the stability or
> degree of regulation of the voltage at the radio under a dynamic
> changing load such as SSB or CW.
>
> All of this is no different than when one uses a battery for their
> radio. In auto installations, for that reason, it is highly
> recommended that a fuse or circuit breaker be located at or very near
> the battery. Same applies here where the supply is capable of
> delivering very high amperage. I realize power supplies of this
> nature have over current protection. However, 70 amps through #14
> wire will will produce lots of heat and smoke amazingly fast.
>
> The correct solution is not so simple in one sense of the word. The
> better solution is to use properly rated supplies for the required
> load. For that very reason, I have two 30 amp CCS rated supplies on
> my desk. One feeds the Elecraft 100 watt transceiver while the other
> feeds the Tentec Eagle 100 watt transceiver.
>
> All of my supplies have both voltage and current meters and they are
> in a position I can see them when I turn them on. With supplies which
> do not have meters, when one turns them on, you never know in advance
> and get what they deliver. In my case, I observe the meters BEFORE
> turning on a radio. On more than one occasion this has saved a radio
> due to a power supply regulation failure. Dumping 24 to 32 volts
> into a $3000 radios is not very pretty. Oh yes, the supplies do have
> OVP, Over Voltage Protection, but I've seen this fail as well and I've
> repaired several supplies where this did fail. And one doesn't know
> it has failed until the voltage goes to maximum value. Its too late
> then to find out the OVP circuit has failed. A meter would have
> prevented radio and accessory equipment damage.
>
> 73
>
> Bob, K4TAX
>
>
>
> On 4/17/2020 12:28 PM,
[hidden email] wrote:
>> I also use an Astron RS-70 for my K3Ss. Like you, mine was not
>> purchased for this purpose. It is under my desk so the physical size
>> is not an issue and I have no worries about overloading it.
>>
>> John KK9A
>>
>>
>> Barry w2up at comcast.net
>>
>> I got a kick out of "big hulking supply," too. I have an RS-70 on my
>> K3. It
>> used to power a lot more stuff, but since I downsized my station, it
>> loafs
>> along. Definitely overkill, but it sits under the desk, out of the
>> way, so
>> why not? Oh yeah, my keyer's on it, too, and still doesn't get warm,
>> even
>> at QRQ :-)
>>
>> Barry W2UP
>>
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