[Amps] Plate choke explodes

[Carl]

----- Original Message ----- 
From: "Bill Turner" <dezrat1242 at yahoo.com>
To: "Amps" <amps at contesting.com>
Sent: Saturday, April 13, 2013 5:25 PM
Subject: Re: [Amps] Plate choke explodes


> ORIGINAL MESSAGE (may be snipped):
> On Sat, 13 Apr 2013 17:02:24 -0400, Carl wrote:
>
>>
>>Why not as it is rated at 1A CCS? It may not like it at 2500W out
>>however......
>>Several HF amps use similar for their "VHF" choke.
>>
>>Carl
>>KM1H
>
> REPLY:
> You are overlooking resonance. The 1 amp rating will be FAR exceeded if 
> the
> tank circuit is ever mistuned, i.e., lightly loaded or accidentally
> connected to the wrong antenna while driven at or near full power.
>
> If you go back through the archives of this group, you will see the
> admonition over and over to AVOID RESONANCES in the plate tank choke, both
> series and parallel.
>
> The Ohmite Z-50 would be a good choice for filtering the HV lead or other
> leads to keep RF out of the power supply on six meters, but not for a 
> plate
> choke.
>
> Bill, W6WRT
>

You need to take a tutorial on resonances and choke specifications.

Carl
KM1H
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