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-   -   CCS turning off prematurely? (http://www.diyaudio.com/forums/tubes-valves/104022-ccs-turning-off-prematurely.html)

Jeb-D. 23rd June 2007 02:50 AM

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?

SY 23rd June 2007 04:23 AM

Could be, could be something else (even a measurement error is possible at these impedances). A schematic would help.

EC8010 23rd June 2007 05:41 AM

Re: CCS turning off premature
 
Quote:

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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