The owners manual for my Alpha specifically states to NEVER use the
radio auto tuner when using the amp. Probably for the same reason.
On 1/23/2012 8:49 AM, k3mm@verizon.net wrote:
> I've never had a failure of my 419's, but plenty with my old Dunestars.
>
> One thing that can cause a lot of problems is running a tuner on your radio
> into a bandpass filter...especially if you have a bad match into your amp or
> antenna. Tuners make the radio happy, but not the device it's "forcing"
> power into...it can create huge voltages that will cause the caps to
> fail...or antenna components to fail...etc.
>
> Also, if the filters are a little out of tune, the tuner will try to
> compensate, creating even more stress on the filter...leading to accelerated
> failure.
>
> Ty K3MM
>
>
> On 01/23/12, Jim Brown<jim@audiosystemsgroup.com> wrote:
>
> On 1/21/2012 4:00 PM, k2qmf@juno.com wrote:
>> I seem to recall there was a cap or two that
>> went bad in some 419's...
> I've had nothing but trouble with the two 419As I bought several years
> ago. I'm guessing that the caps are simply under-rated for dissipation,
> because it's common for them to fail with only 100W at 2:1 or lower VSWR.
>
> My experience has been that they won't handle more than the 30-50W it
> takes to drive my Titan amps. At that level, they seem to hold up OK.
> They're currently sitting in my storeroom, having been replaced by a
> pair of W3NQNs that are on long term loan.
>
> If you're going to replace any of these caps, I'd try to find some with
> higher dissipation ratings.
>
> 73, Jim K9YC
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--
73,
Gary K9GS
Check out K9NS on the web: http://www.k9ns.com
Greater Milwaukee DX Association: http://www.gmdxa.org
Society of Midwest Contesters: http://www.w9smc.com
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