forgot to write ...... above needed from reason that Papa's origigi F8 is AC coupled, including NFB divider, while I wanted to make Babelfish fully DC coupled
so, ZM naive or not, resorted to NFB divider resistor values range lower than Pa's, to squeeze Ugs of JFet, wanted Iq of JFet, wanted current envelope ....... all that in one frame
go figure
again, as said numerus time ( usual ZM's trickery of looking witty and smart) - in most cases it looks as amp is more made of compromises than of parts........
but!
one amp being exception, and we all know which one it is - Best of Them All - FW M2
Pure Poetry, with pinch of Monty Python
I look forward to try out the F8(a) even that I will use the M2X chassis for that.
I think my home will be almost a Push-Pull free zone.
I think my home will be almost a Push-Pull free zone.
as push-pull-less ....... or as free-for-all-push-pulls?
as I see it, B. F8 is still proper push pull thingie, nothing wrong with that
personally, if looking at black box, I really don't care what's in it, if sounding proper; intended THD Spectra should be high on project goals, and then you have that everything is possible, even wooden stove
now, concept as idea, that can be and it's in many cases source of pleasure and satisfaction ......... "Now I'm going to make amp with tubes and germaniums, how fun is that going to be!!!"
as I see it, B. F8 is still proper push pull thingie, nothing wrong with that
personally, if looking at black box, I really don't care what's in it, if sounding proper; intended THD Spectra should be high on project goals, and then you have that everything is possible, even wooden stove
now, concept as idea, that can be and it's in many cases source of pleasure and satisfaction ......... "Now I'm going to make amp with tubes and germaniums, how fun is that going to be!!!"
told ya - even wooden stove .......
now, I have a problem, in some things being taught by Papa's overall practice ( and not to forget to mention Wayne)....... when committing to some idea/project I'm not anymore finding full pleasure/satisfaction if not done in full format, practically every last part/wire/screw must have own dedicated place, proper spacing of all sub-blocks, minimum wiring etc.
years of service work resulted of Mighty ZM being fed up with bunch of small pcbs in case, connected with zillion of tiny wires, if there is possibility to do it in better way
so, I'm getting 3 different interesting ideas (remember, ZM practically Junkie, Homer, Blue Car!!) every day ....... but then I think of proper way how to do it ...... and inevitably majority of funny ideas are not even getting on list, either written or just mental
huh, life was simpler when I was younger .......
speaking of EL84 (and EL34, and 6L6 and KT66 and 807) .......
now, I have a problem, in some things being taught by Papa's overall practice ( and not to forget to mention Wayne)....... when committing to some idea/project I'm not anymore finding full pleasure/satisfaction if not done in full format, practically every last part/wire/screw must have own dedicated place, proper spacing of all sub-blocks, minimum wiring etc.
years of service work resulted of Mighty ZM being fed up with bunch of small pcbs in case, connected with zillion of tiny wires, if there is possibility to do it in better way
so, I'm getting 3 different interesting ideas (remember, ZM practically Junkie, Homer, Blue Car!!) every day ....... but then I think of proper way how to do it ...... and inevitably majority of funny ideas are not even getting on list, either written or just mental
huh, life was simpler when I was younger .......
speaking of EL84 (and EL34, and 6L6 and KT66 and 807) .......
Attachments
At FW-site F8 is listed as a SE.
In B-F8 case is it the change to symmetrical rails that makes is a PP?
Just to understand the concept........
In my case with B-F8 I need >10 dB gain in my DAC setup.
So F8 perfect for that. I can go from DAC in pre-amp mode directly to F8 (no need for additional pre-amp).
F8 is easy to drive with its JFET input circuit.
In B-F8 case is it the change to symmetrical rails that makes is a PP?
Just to understand the concept........
In my case with B-F8 I need >10 dB gain in my DAC setup.
So F8 perfect for that. I can go from DAC in pre-amp mode directly to F8 (no need for additional pre-amp).
F8 is easy to drive with its JFET input circuit.
Technically, of course that Pa is right but, on the other hand, there is nothing in this world strong enough to suppress Papa's mischief
You can look at same differentiation from two angles - are both SE Parts modulated from FE........... or one side is active while second side is idle
by first criteria shown SE is certainly SE
by second criteria - upper mosfet certainly isn't pure CCS, and upper one is certainly giving equalish current contribution to sum output current
easiest to take Aleph (any) as example - as it is - it's special case of SE, both halves contributing to output; remove Aleph CCS modulation, it becomes pure CCS, just idling and lower part is doing entire work
Papa later introduced Mu-follower in small amps, serving and acting practically same as Aleph CCS (but easier to implement, in general); stage known from tube era, go figure
and that's exactly what's in F8, Mu Follower, directly modulated lower OS part, while upper one acting as pure CCS in DC domain, while in AC domain modulated by current changes in lower part
Thank you for the clarification.
Then there are not many "pure" SE transistor amps. Maybe MoFo the only one with only a single output-device.
The first Zen-amp also just had a single device.
Then there are not many "pure" SE transistor amps. Maybe MoFo the only one with only a single output-device.
The first Zen-amp also just had a single device.
If you see one transistor (or group of) directly modulated, and other side is either resistor or choke or pure CCS (without modulation), that's pure SE.
Examples are endless
take F4 used as balanced monoblock; feed two halves (channels) with balanced signal - that's bridged amp, push-pull .......... kill one side of input ( either pos or neg), suddenly amp is pure SE
take F6, as is; it's PP amp; remove xformer winding from one OS side and establish biasing of same in same manner just without secondary involved (so no modulation to said part), it becomes pure SE amp
take any of PL X/XA/XS amps, do the same as written for F4 above, it's pure SE amp
Examples are endless
take F4 used as balanced monoblock; feed two halves (channels) with balanced signal - that's bridged amp, push-pull .......... kill one side of input ( either pos or neg), suddenly amp is pure SE
take F6, as is; it's PP amp; remove xformer winding from one OS side and establish biasing of same in same manner just without secondary involved (so no modulation to said part), it becomes pure SE amp
take any of PL X/XA/XS amps, do the same as written for F4 above, it's pure SE amp
Interesting development. The THD spectra at low power is rather remarkable i think, to the right kind of person, almost 30db between 2nd and third.
Btw, maybe you would be interested also in JFE2140 for input, new production matched dual in single package, IDSS similar to 2sk2140BL, nice Gfs and low noise. Or JFE150, already paralleled version of it (but IDSS might be high for this project).
Actually i dont know if its exactly the part for here but im just saying in general also, maybe it comes useful to you in the future.
Maybe where you'd otherwise need an lsk389, but that's in production too so..
Btw, maybe you would be interested also in JFE2140 for input, new production matched dual in single package, IDSS similar to 2sk2140BL, nice Gfs and low noise. Or JFE150, already paralleled version of it (but IDSS might be high for this project).
Actually i dont know if its exactly the part for here but im just saying in general also, maybe it comes useful to you in the future.
Maybe where you'd otherwise need an lsk389, but that's in production too so..
it's good that there is broad choice of presently manufactured JFets
though, I believe of all of them 2SK209Y or 2SK880Y are straightforward easiest choice
minimal value of shifter resistor, more than decent xconductance ....... in all things made and declared as part produced for audio applications ......... and cheap as chips
though, I believe of all of them 2SK209Y or 2SK880Y are straightforward easiest choice
minimal value of shifter resistor, more than decent xconductance ....... in all things made and declared as part produced for audio applications ......... and cheap as chips
Yes very true we are lucky to have those buggers. EUVL i think even measured comparison of 2x 209GR with a single sk170, favorably.
But yes just saying for mental toolbox, i dont see many using on the forums, few projects maybe but recent ones, even though JFET out for few years. So if it doesnt have that much exposure i mention it to you since i know you would use it well if the day ever came.
But yes just saying for mental toolbox, i dont see many using on the forums, few projects maybe but recent ones, even though JFET out for few years. So if it doesnt have that much exposure i mention it to you since i know you would use it well if the day ever came.
I'm perfectly happy with 2SK2145, BL, as a weapon of choice
I did look in past at all of those you listed, and still finding 2145 ticking most of ticking boxes, for my purposes
this is going to be first time of me reaching to any other type, reasons explained above
anyhow, Long Live JFets!! .........
(much easier to use than EF86, E180F and E810F; though, these are much easier to get proper triode)
I did look in past at all of those you listed, and still finding 2145 ticking most of ticking boxes, for my purposes
this is going to be first time of me reaching to any other type, reasons explained above
anyhow, Long Live JFets!! .........
(much easier to use than EF86, E180F and E810F; though, these are much easier to get proper triode)
I'm going to make Babelfish F8m
all parts mosfets, all in TO247 case, well, except optocoupler
all parts mosfets, all in TO247 case, well, except optocoupler
ZM asking Pa, is it allowed to make Babelfish F8m, with 5pcs of TO247 mosfets on board, one opto and one smd bjt
All I can imagine at the moment is ZM on a Guzzi wearing pink polka dotted spielhosen going door-to-door convincing people he's selling encyclopedias... when his real motive is to sneak in and install proper audio gear.
OK, as usual, ZM is cheating, big
There is Babelfish 8m edition, but one with TO247 I'm going to keep only for my self, as supperduperwakoo specimen
What is adequate for public is sane version , made with nice parts
Funny pics, as necessary Proof is in da Porn
