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Re: [Amps] 8877 Grid Trip timing

To: "Tom Rauch" <w8ji@contesting.com>,"Rick Stealey" <rstealey@hotmail.com>, <amps@contesting.com>
Subject: Re: [Amps] 8877 Grid Trip timing
From: "Jim Tonne" <tonne@comcast.net>
Date: Tue, 2 Oct 2007 11:33:23 -0400
List-post: <mailto:amps@contesting.com>
Tom wrote (in part):

> My homebrew amps trip in less than 2mS of excessive grid 
> current. They also fault if the reflected power is more than 
> 20% of forward power.

Excellent!

And in the high power shortwave transmitter world those
transmitters use crowbars and trip even faster than that.  
Those big tubes are pricey and even a millisecond grid fault 
can melt it and cost a fortune.

- JimT   WB6BLD


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