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Old 21st March 2008, 06:31 PM   #1
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Default KT88s and grid current

How do KT88s perform in AB2(triode connected)? Anybody ever done it? Dumb idea?
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Old 21st March 2008, 07:00 PM   #2
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hey-Hey!!!,
Heathkit and McIntosh ran them to grid current in W6m, MC60 and MC75 designs. I can't see why triode connection would pose any significant trouble.
cheers,
Douglas
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Old 21st March 2008, 07:17 PM   #3
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I was mainly concerned with:

1. Grid dissipation. There is a potential to drive the grid quite a ways positive when triode connected. Don't know if this would cause harm.

2. Grid stopper, which I kind of thought was necessary. However, the designs you pointed out omit them.
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Old 21st March 2008, 07:33 PM   #4
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hey-Hey!!!,
Grid stopper resistors would create distortion due to the voltage developed across them as grid current flowed. As yu noted, where it is reasonably expected, they are left out.
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Douglas
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