Discrete TubeLess...

[TELEFUNKON]

Anyone tried these? Sound samples? Thanks in advance. 
grol

IIRC, there were some more or less crappy U2be clips earlier in this thread?
Obviously the OP has tried out some.

[gaussmarkov]

Seeing as this thread was revived, might as well give an update. 

Although RG's biasing was simpler, I reverted back to my original idea using feedback as part of the biasing.  Controlling closed-loop gain enabled me to contain things within the soft clipping zone.  Without it, there's a fine line before the amp is pushed into hard clipping (very unmusical as there's no gradual onset).  For a workable design a multistage circuit is required, plus a scope and signal generator.

Didn't build a circuit.  Unless CMOS chips go the way of the dodo, I'll stick with them as less work is required.

geez, gez, i was hoping for a better outcome.  this is really disappointing news, though a really appreciate that you have told us.

cheers, paul

p.s.  apologies for the cheap pull on your handle.

[gaussmarkov]

I dug them out again for explanations in some other recent threads.

they`re interesting, but don`t reveal all questions:
FET principles & circuits pt.1,
pt.2,
pt.3,
pt.4, by the great Ray Marston.

Those N&V links don`t seem to work anymore
but excerpts are found here: http://www.uoguelph.ca/~antoon/tutorial/xtor/xtor10/xtor10.html

i have copies.  here are links:

FET principles & circuits pt.1,
pt.2,
pt.3,
pt.4, by the great Ray Marston.

[puretube]

Of course, I have a copy, too...
Just ain`t got no rights...

BTW: that "~antoon" link leads to some very nice stuff... Thanx!

[gez]

geez, gez, i was hoping for a better outcome.  this is really disappointing news, though a really appreciate that you have told us.

Paul, my comments refer to the JFET inverter idea.  Nothing wrong with it (sounded good), it's just that I personally don't see the point of building discrete circuits when there's an easier alternative: CMOS inverter chips.  The day they stop making these, then I'll start playing around with JFETs etc.

p.s.  apologies for the cheap pull on your handle.

Consider me flushed! 

[gaussmarkov]

geez, gez, i was hoping for a better outcome.  this is really disappointing news, though a really appreciate that you have told us.

Paul, my comments refer to the JFET inverter idea.  Nothing wrong with it (sounded good), it's just that I personally don't see the point of building discrete circuits when there's an easier alternative: CMOS inverter chips.  The day they stop making these, then I'll start playing around with JFETs etc.

ah, but you have given us a point already, haven't you?    an asymmetric version?  i haven't forgotten, because you scooped me on that one by several years. 

[grolschie]

What about the 170/250 MOSFET idea at the beginning of the thread?    Or have I missed something?    Thanks in advance. 

[puretube]

Anyone tried these? Sound samples? Thanks in advance. 
grol

IIRC, there were some more or less crappy U2be clips earlier in this thread?
Obviously the OP has tried out some.

All "puretube`s" circuits, schemos and "crappy" sound-/video clips until reply#77 are tested, measured 170/250 builds...
(and the reason/origin for this thread explained in 1st post & reply#8)

One of the fine options of the WWW is the clickability of hyperlinx... 

[puretube]

Anyone tried these? Sound samples? Thanks in advance. 
grol

IIRC, there were some more or less crappy U2be clips earlier in this thread?
Obviously the OP has tried out some.

All "puretube`s" circuits, schemos and "crappy" sound-/video clips until reply#77 are tested, measured 170/250 builds...
(and the reason/origin for this thread explained in 1st post & reply#8)

One of the fine options of the WWW is the clickability of hyperlinx... 

Another fine free thing for all non-illiterates* is the socalled topic- or thread-title (aka: "subject"),
which in this special case says: "Discrete..." as opposed to: "integrated..."



As mentioned in above post,
an explanation for the experiments with 2 complementary discrete MOSFETS was given in reply#8,
and will be repeated in the following quote,
for those who don`t wanna look past the first pic in a thread:

... came up with this coz I didn`t have non-SMD inverters at hand to quickly view...

So it should be clear,
that this whole stuff was not about "emulating  tubes with fets",
but: "replacing a CMOS inverter IC with discrete MosFets"
(as far as my circuits are concerned).

And: it should also be clear by now, that those circuits are not an attempt
to make fets sound like tube-amps at all.
On the contrary:
I haven`t witnessed any (pure) tube-amp or (pure) tube-pedal outside my premises,
that would feature most of what those MosFet circuits do, soundwise...


*that come forum-crossing to this thread for the first time


pleez also see replies #24 & #38 for further understanding...