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    Building, troubleshooting and testing of these amplifiers should only be
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    the safety precautions around high voltages.

WTH -- UL back to triode connection

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What in the world....

Have a ST70 with kevinkr's driver. Was originally hooked up in triode mode. Had nice looking square waves after some tweaking (under a previous thread). NO problems.

Out of curiosity, I connected things in Ultralinear (only the left channel), just to hear the difference. No big improvement, so I went back to triode.

Now, square waves look like this. Sorry for the blurriness, but you get the picture.

What happened? Doublechecked I put the 100 ohm resistor back - from pins 3 to 4. UL tap is connected to pin 6, which has no internal connection.

????????
 

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