[Amps] 8877 grid trip

[TexasRF at aol.com]

If your amp has a standby/operate switch, you could use one pole of that to  
open the grid trip latch circuit. 
 
Actually having to push or operate some switch forces you to consider the  
possibility that something is amiss. If you are disciplined enough to take  
proper action, the auto reset would certainly work.
 
73,
Gerald K5GW
 
In a message dated 3/21/2007 8:42:07 A.M. Central Daylight Time,  
rstealey at hotmail.com writes:


On  my 8877 that I am building there is a grid trip circuit.  When it trips  
it requires a pushbutton on the front panel to reset it.  I want to  minimize 
front panel switches.  Is there any reason I shouldn't 't  have it reset 
itself as soon as I drop the PTT?  I am assuming that  whenever the grid 
trips it is due to momentary mistuning, not some  catastrophic failure.  I am 
considering setting the trip current at  100 ma initially, although I think I 
saw on the reflector somewhere that  about twice this amount was safe but not 
needed in normal operation.   Until I am familiar with the amp and it is all 
debugged I want that tube  protected, and in fact I WANT to see the grid trip 
circuit doing its  thing, but I'd like it to signal that it has tripped and 
then reset and  away we go again.  Thoughts?

More topics to come....  a  preview - considering putting a 1-2 db pad on the 
input since it only  needs 65 watts drive from my 100 watt driver.

Rick   K2XT

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