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"content": "5) Second test, where thermal runaway was very noticeable\n\nI let the amplifier run with constant 13.2 V power supply, fixed gate bias voltage, and constant 0.2 W input power. The transistor tabs reached 70 °C in about a minute. The current consumption kept increasing.\n\nThis is in line with what F5NPV wrote about on his blog and nostr:npub1v2zcasexkkzu84paqpsu74v0w77a2hfqhdvfku0d22mggxn5ea7qxk0xqq pointed out here on mastodon. The bias circuit doesn't have any temperature compensation. So this is to be expected!\n\nLinks to YouTube and MakerTube videos:\n\nhttps://youtu.be/kbxbTp3CwPo\n\nhttps://makertube.net/w/5Nx4uXhbry3zhF468iNwru\n\n#AmateurRadio #HamRadio #electronics\nhttps://media.tilde.zone/media_attachments/files/113/857/373/357/724/154/original/1524e4ba5cd7b12d.png\n",
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