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SpreadSpectrum 21st March 2008 07:31 PM

KT88s and grid current
How do KT88s perform in AB2(triode connected)? Anybody ever done it? Dumb idea?

Bandersnatch 21st March 2008 08:00 PM

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.

SpreadSpectrum 21st March 2008 08:17 PM

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.

Bandersnatch 21st March 2008 08:33 PM

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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