[AMPS] Problem with Plate Choke

[Christophe Bajulaz]

Hello,

I have built an All-band (excepted warc-band), 2000-Watt-output 8877
linear amplifier.

However, I have a problem with the Plate Choke, which is connected
between the tube and the PI-L ciruit.
I was testing the amplifier on 10M when the ouptut power (around 1KW)
suddenly drop down. I immediatly switch off the amplifier and I could
see that the Plate Choke was extremly hot, at such a point that the
resin was running down the Choke !
There's no need to say that the choke has burned out !

I used a High power manufactured Plate Choke (B&W BBC-5K): 
Power Rating 5KW
Maximum DC voltage 5KV
Maximum DC current 2A


None of these characteristics was exceeded (1KW output, 4KV DC under
800mA).

I can't understand the reason of this incident.

Best 73's de F5AVK, Christophe

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