[TowerTalk] ICE 419?

[Gary K9GS]

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 at 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 at audiosystemsgroup.com>  wrote:
>
> On 1/21/2012 4:00 PM, k2qmf at 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 They're currently sitting in my storeroom, having been replaced by a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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