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Look at the waveforms on the two grids of the 6SL7. Do they look the same, but inverted (same amplitude, slope)?
The second half of the 6SL7 gets its signal from the plate of the first half, through C57, C142, R117, R58, C58 and R57. If any of these parts is bad it will result in an improper waveform on the grid of the second section, and therefore bad linearity.
Last edited by Steve McVoy; 07-07-2004 at 07:38 PM.
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