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Old 23rd June 2007, 02:50 AM   #1
Jeb-D. is offline Jeb-D.  United States
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Default CCS turning off premature

One of my amps has a stage with a CCS loaded 12ax7 and it seems to be clipping about 25 volts before it hits the supply rail. Is it possible the transistor is turning off due to lack of current?
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Old 23rd June 2007, 04:23 AM   #2
SY is offline SY  United States
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Could be, could be something else (even a measurement error is possible at these impedances). A schematic would help.
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Old 23rd June 2007, 05:41 AM   #3
EC8010 is offline EC8010  United Kingdom
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Default Re: CCS turning off premature

Originally posted by Jeb-D.
One of my amps has a stage with a CCS loaded 12AX7 and it seems to be clipping about 25 volts before it hits the supply rail.
Or to put it another way, the CCS allows the 12AX7 to swing its anode to within 25V of the HT. That's pretty good.
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