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-   -   A curious observation (http://www.diyaudio.com/forums/tubes-valves/78514-curious-observation.html)

alexmoose 27th April 2006 09:31 PM

A curious observation
 
Hi, as I posted earlier, my first diy works, however I have a rather curious problem/question.

when my amp is warmed-up, and has been going for a while, When I flick off the main switch, after a second or two, the sound grows far louder, and more full for about a second, then dies down. any ideas as to why this happens?

danFrank 28th April 2006 02:09 AM

Hi, The negative bias capacitor supply drains out faster than the B+ supply, so for a short time the output tubes are biased "hotter" until the B+ caps lose their charge. This will not harm anything because it lasts for such a short amount of time. In fact, this helps with the draining of the B+ filter caps.
Daniel


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