Make sure the input circuit is lined up with the proper output band.

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On the input side, it seems fine. I'm driving L7 with an FTDX-3000. I performed a TUNE, forcing the RLY relay to close, and I have a VSWR of 1.

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Test conditions:

·???????? Idle: 2600 V, 140 mA for a 6.5 V bias.

·???????? At the output, I'm on a 50-ohm dummy load; the L7 doesn't indicate any output VSWR.

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However, I just noticed that on the 7.100 MHz band where I was testing, the LOAD capacitors (C4, C47) are at their maximum. I checked; they are indeed in parallel on this 40 m band. The amplifier can't output more than 400 W.

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On 3.650 MHz, the same problem: this LOAD capacitor is at its maximum. The amplifier peaks at 400 W for 400 mA at 2300 V and 25 W input.

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At 14,200 MHz, the LOAD capacitor is at its midpoint, and a 25 W input produces 500 W (2300 V, 390 mA).

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I don't know what to think anymore.