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Old 25th August 2011, 11:30 PM   #51
kees52 is offline kees52  Netherlands
diyAudio Member
Join Date: May 2009
Location: Sprang-capelle Holland.

Foto-0003#1.jpgI am back again, wel the news is with a 12ax7 on 1 mA idle I get slewing with the gyrator, an square wave become a sawtooth on 18 khz, the sound however is very nice.

with a sweep I miss some around 15 to 20 khz, it seems that miller capacity is playing a role here, I think more it is the mosfet in gyrator (DS capacity), I use a irfu9310 mosfet, I think I get to use a small one if I use low idle currents, I have use the 12ax7 as a anodefollower and the other section as a kathode follower, I had a tip to use a cascode circuit, but then a feedbacked one, like in example, 10k anode resistor is a gyrator in my simulation, I have not a measurement in real yet, if it is mosfet problem then here also I get problems, because cascode has high resistance on output and I need low...

Picture of scoop was with a CCS to anode, driving a EL84 directly without a kahode follower and that was fine like you see, (20Khz) nice square wave.

Last edited by kees52; 25th August 2011 at 11:33 PM.
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Old 28th August 2011, 11:47 AM   #52
kees52 is offline kees52  Netherlands
diyAudio Member
Join Date: May 2009
Location: Sprang-capelle Holland.
Welll CCS is back again, then I have no problems with 12ax7 anymore, sound is indeed more harsh with a CCS but stage is deeper, so I have idle the follower higher so I get some warmth, later on I try the bsp25 if I can get it here, because I live in a phillips country., maybe I get answer about this problem of miller here?
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