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In Reply to: RE: That's not a differential input posted by Triode_Kingdom on December 08, 2015 at 19:11:06
Read carefully. I said he had to drive, not ground, the non-inverting grid.
BTW, regardless of the amplifying device used, a tail CCS is in order.
Eli D.
Follow Ups:
Yep, sorry, I missed that. I will go on record though as being particularly uncomfortable (I'm being diplomatic here) with all those SS devices you toss into vacuum tube circuits. You probably already know that. :)
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Buy Chinese. Bury freedom.
I have a lot of experience using CCSs with LTPs. Cascode MOSFETs are way better than single MOSFET based CCS. IXYS 8N50D2/1N100D better sounding than DN2540s. But for currents less than 10mA a cascode BJT (BC549C for example) out performs any of the MOSFETs.
I guess if you HAD to use tubes a pentode based CCS would work well. That would be quite the pain in the ass though to implement. However, looking around this forum I do see many members of the "Hair Shirt" DIY audio bent. ;~)
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
You've never seen me use a SS voltage amplifier. As of now, the only place I'd be comfortable with SS voltage amplification is in Allen Wright's hybrid cascode LOMC phono setup.
BTW, I do own a Klyne model 1 LOMC "head" amp, which is 100% SS, but that unit has a well proven track record. Some folks can make SS "dance", Stan Klyne and Nelson Pass to name 2.
FETs, being high impedance, voltage controlled, devices, mate well with tubes. FETs make excellent current amplifiers (voltage followers). While it is an over simplification, think of a FET as a heaterless pentode. :> D
I'm a pragmatist. If a lump of galena yielded good sound (it definitely does not), I'd use it.
Eli D.
I read that as "heartless pentode" and thought, damn, that's harsh.
Doug
Somebody's "sand allergy" got the better of them. FETs make excellent "spear carriers" for tubes. Pick your spots carefully.
Eli D.
I'm over my sand allergy!
I am loving Cree schottky diodes and constant current sink cascodes with mosfets.....
Try the unbalancer circuit from John Broskie
http://www.tubecad.com/2011/03/blog0203.htm
Come on TK, Try it...your ears will like it ;> )
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