Foreplay III Extended Voltage Check at Terminal 12

Comfortably Dumb · 3520

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Offline Comfortably Dumb

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on: November 03, 2010, 12:38:05 PM
I just completed my FPIII Extended upgrade and all voltages and resistances are within tolerance, however I noticied that the voltage at terminal 12 starts out around 180V and only reduces to 150V after a few minutes of turning the FPIII on. 

I have not hooked up the FPIII yet to see if plays, as my amp is at the amp doctor right now getting a check up.

Is the terminal 12 voltage of 180V at startup indicative of anything?

Thanks.


Offline Paul Joppa

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Reply #1 on: November 03, 2010, 01:12:03 PM
No problem. The hybrid shunt regulator does not kick in until the tube warms up; until then the voltage is high.

Paul Joppa

Offline Comfortably Dumb

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Reply #2 on: November 03, 2010, 01:23:41 PM
Quote from: Paul Joppa on November 03, 2010, 01:12:03 PM
No problem. The hybrid shunt regulator does not kick in until the tube warms up; until then the voltage is high.
Thanks.


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