I am in the process of building a single band linear for 160 meters using a
pair of GI-7bT tubes. The reason for single band is that I have 3 other linear
amplifiers that cover 80 through 10 but none of them cover 160 meters.
Looking at various circuits (gleaned from the Internet) I notice one common
factor and that is none of them, at least that I have found, have any provision
for monitoring grid current. Also, unless I am overlooking something, I don't
find any specifications for maximum grid current for the GI-7b or GI-7bT.
My 160 meter exciter puts out a maximum of about 80 watts which definitely
should be plenty to drive a pair of GI-7bT tubes. Anyway, does anyone have any
suggestions or information on if I should have any worries about this. I am
well aware of grid restrictions on tubes like the 811A, 572B, 3-500Z, etc.
But, this is my first venture using the GI-7bT tubes.
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