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1. [Amps] Strange pi network tuning problem (score: 1): Author: Guido Tedeschi <guidoted@gmail.com>; Date: Sun, 12 May 2019 01:33:02 +0200; The PA of the Yaesu FL-200B that I'm restoring has a strange problem: it tunes perfectly on 15 and 10m, but on 20, 40 and 80m it doesn't tune correctly, the power is low, the current is high and ther; /archives//html/Amps/2019-05/msg00032.html (7,221 bytes)
2. Re: [Amps] Strange pi network tuning problem (score: 1): Author: Guido Tedeschi <guidoted@gmail.com>; Date: Mon, 13 May 2019 22:24:02 +0200; First of all, thanks to everybody for the answers. Here are some tips: 1) Yes, I'm using a dummy load, which has a good SWR across the bands (1.2 max on 20m, less above and below, measured on the TX; /archives//html/Amps/2019-05/msg00045.html (9,828 bytes)
3. Re: [Amps] Strange pi network tuning problem (score: 1): Author: Guido Tedeschi <guidoted@gmail.com>; Date: Wed, 15 May 2019 23:01:34 +0200; Hi Ron, here are the graphs with Return Loss and Z, plus also two markers above and below the frequency of resonance: https://drive.google.com/open?id=1SGQP9o7CZHm7UfXB0Fk31Nce3_TA_0Eo https://drive.; /archives//html/Amps/2019-05/msg00052.html (10,120 bytes)
4. Re: [Amps] Strange pi network tuning problem (score: 1): Author: Guido Tedeschi <guidoted@gmail.com>; Date: Wed, 22 May 2019 23:46:57 +0200; Finally, I found the problem: it was a capacitor in the neutralization network (between cold side of driver coils and ground) which was 44pF instead of 250pF. It is not indicated in FL-200B schematic; /archives//html/Amps/2019-05/msg00063.html (8,985 bytes)

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