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@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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