Diagnosing parasitic oscillation caused by microphonic 12ax7 preamp tube in Carvin Belair 50

Описание к видео Diagnosing parasitic oscillation caused by microphonic 12ax7 preamp tube in Carvin Belair 50

Here I am diagnosing a microphonic preamp tube as the majority of the cause of the squealing parasitic oscillation that is happening in the clean channel of the Carvin Belair 50 amplifier. A trick was utilized to finally diagnose the culprit by switching to the soak channel to make the microphonics come out. While not 100% cured as I believe there are some soldering issues as well in the board mounted tube sockets, it has been greatly reduced! A modern made Mullard cv4004 was used to replace the faulty tube in the V1 position.

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