looking forward to seeing your amp come to life...
after all this is what this site is all about...
diy'ers building things...it may not be perfect, but...
you were asking for advices, but it seems to me,
"when i need your advice, i will give it to you..."
good luck...
only time will tell whether an amp will come to life based on what you posted...
after all this is what this site is all about...
diy'ers building things...it may not be perfect, but...
you were asking for advices, but it seems to me,
"when i need your advice, i will give it to you..."
good luck...
only time will tell whether an amp will come to life based on what you posted...
I found that for triode connected EL34 µ=11, then at the regulator output (Due to AC heaters)
Vac ≈ 2.4 nV
And I think that it is negligible.
Vac ≈ 2.4 nV
And I think that it is negligible.
i) You live about 18000 Km away from me, so you have no idea about my building amps/preamps. I have some photos, but only for my friends.
ii) Whenever I can, I try to be original, not making the design of other people. This is more time consuming.
iii) This design is not for my customers, only exclusive to me, and my budget is very low. I am poor.
iv) You are just a moderator, not my father, so the time taken for a project is my business, not yours.
… Oh, popilin has managed to amuse us once again. Perhaps he'll confirm, but he's bored. Bored of the 250 year old recovered Japanese boat-anchor chain forged plane-bit, then finished, submerged mahogany log cabinetry. He's bored of 3 triode amps, of rectifier→cap→inductor→cap power supplies. He's going bonkers trying to sound suave and seductive in his self-deprecating rhetoric. “Oh, I don't know much about nuthin', but here we have μ times ∫catnips dt, and I'm not quite sure whether √(2)π is going to cut it!”
About sums it up.
You're playing into his (her?) hand.
I'm not.
Thing is, from experience (hence "amuse us once again"), I know that Ol' Poppy is a dâhmned brilliant electronic designer. His avatar gives it away - he really is that lil' guy that has encyclopedic pages for hair. If it were but my fate to have 1% of his creativity, well … I'd be king. Or close.
Popilin, what on earth are you trying to over engineer a totally over-engineered shunt regulating power supply for? You (come on, admit it) know full well that 2.73 mV of power supply ripple at 400+ volts … is only "audible" if you've got your whole head sitting directly next to the subwoofer. And even then, as soon as the merest inkling of music comes thru the system… such –80 dB hummmmmm is long, long lost. Unless of course, you're simply bored to tears and know in your heart that there really is ONE single, admittedly gold-plated pea underneath those 14 mattresses.
LOL!
GoatGuy
yes, the moderator who moved your thread back to this forum....tubes/valves..
i was just posting my observations, how many threads did you open up asking for advice which turned out to be a demonstration of your math skills?
Threads closed do not count, isn't it? 🙄
Math skills... a division and a multiplication... 😀😛
And they are subject to correction from real skilled members... 😉
I'm one of the friends the OP mentioned, and I can attest to the fact that he does in fact build things, considers the engineering quite carefully, and has lots of interesting ideas which he will investigate in hardware as time and money permit.
Geography plays a role here that many in the U.S. and EU under appreciate in terms of getting things and relative to what they cost there vs elsewhere.
He's passionate about the hobby to a fault and that should come across whether or not you agree with his design rationale.
Geography plays a role here that many in the U.S. and EU under appreciate in terms of getting things and relative to what they cost there vs elsewhere.
He's passionate about the hobby to a fault and that should come across whether or not you agree with his design rationale.
It is weird, but in simulations, without the valves i.e. no AC heaters, big MOSFETs seems to give better results for the lower device, the other way round for the upper device on the cascode CCS.
I thought in transconductance, but as I said before, in this matter I play by ear.
+1
These results could save me money and heat dissipation. 🙂
A very good one! Thanks Kevin! 🙂
What about the results of posts #40 and #42, do you think that I am right?
Be careful with your words, we have too many perfect-moral people on the forum today... 😀😛
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I think either you are mad (and aren't we all!), pulling our legs, or April 1st came early !
And I don't even refer to post #42 but to the first post - such a huge complex regulator 😀
TBH I'm not sure about #40 and #42, you will need to test to be sure the numbers derived for AC noise are correct, the math certainly looks right.
The bigger concern might be AC common mode on the filament rather than the actual heating voltage, this is what has mostly been shafting me in my low noise regulators. Electrostatic shields help a lot as well as elevating the filaments and using an unintuitively larger capacitor than seems required to shunt CM noise on the filament circuit to ground.
My experience is that LTSpice is a rather optimistic in terms of predicted noise and distortion particularly where tubes are concerned, take with a grain of salt and assume it's off by 20dB. Someone like keantoken or mooly are far more conversant with the limitations of LTSpice and work arounds than I am. I tend not expect terribly accurate results unless I am willing to track down and fix all of the errors in models, and apply all the algorithmic optimizations available.
On my SE amps I find a couple of mV of ripple and broadband noise on the supply rails acceptable, generally output noise is in the range of 250uV over a 20 - 20kHz range, and is completely inaudible with 100dB plus speakers. Unfortunately in the line stage the issue is an order of magnitude more critical, and phono stages worse still - to the extent that my newest [phono] designs actually have solid state regulated bias and B+ supplies. 😱
I'm largely immune to the perturbations of others here, not so much in real life I'll admit.. 😀
The bigger concern might be AC common mode on the filament rather than the actual heating voltage, this is what has mostly been shafting me in my low noise regulators. Electrostatic shields help a lot as well as elevating the filaments and using an unintuitively larger capacitor than seems required to shunt CM noise on the filament circuit to ground.
My experience is that LTSpice is a rather optimistic in terms of predicted noise and distortion particularly where tubes are concerned, take with a grain of salt and assume it's off by 20dB. Someone like keantoken or mooly are far more conversant with the limitations of LTSpice and work arounds than I am. I tend not expect terribly accurate results unless I am willing to track down and fix all of the errors in models, and apply all the algorithmic optimizations available.
On my SE amps I find a couple of mV of ripple and broadband noise on the supply rails acceptable, generally output noise is in the range of 250uV over a 20 - 20kHz range, and is completely inaudible with 100dB plus speakers. Unfortunately in the line stage the issue is an order of magnitude more critical, and phono stages worse still - to the extent that my newest [phono] designs actually have solid state regulated bias and B+ supplies. 😱
I'm largely immune to the perturbations of others here, not so much in real life I'll admit.. 😀
oh yeah, i remember that Lirpa turntable featured in the Audio magazine many many years ago....Lirpa Labs Lirpa Turbo Steamtable TurnTables | Audiokarma Home Audio Stereo Discussion Forums
So I guess you would put the SSHV2 in the Lirpa category as well since it is relatively complicated? Semiconductors are cheap, and PCBs not hard to make if you have the skills... You'd hate the stuff I work on to make a living.
everyone has a right to be unique....
and i am glad to be no longer making a living, just having fun,
the money being incidental...
if i may add a small contribution here, i think that the design of the shunt reg starts with the power traffo on hand, the load current and the balance of available current that the shunt reg will have to carry...
and i am glad to be no longer making a living, just having fun,
the money being incidental...
if i may add a small contribution here, i think that the design of the shunt reg starts with the power traffo on hand, the load current and the balance of available current that the shunt reg will have to carry...
What a relief! Hurray!
Circuit analysis is not my strong point... 😀😛
I will study this with more detail.
My experiences comparing LTSpice predictions with reality are more positives, I will relate one: Morgan Jones has a circuit of a mu follower to measure valve distortion, with Koren models the simulations match incredibly well with results published on his book.
keantoken gave me some tricks and some amazing explanations also.
Hey, your designs set the standards very high, I'm satisfied with the 50% of simulation specs, not to uncork champaign, but a beer at least. 😀
In real live I can walk on the street without problems, here I cannot say the same... 😀😛
With all due respect, that is a poor contribution.
It's the other way around, first you must design the amplifier, this imposes PSU conditions, AFTER that, you can design the shunt regulator, and AFTER that, you can design/calculate the power transformer, and AFTER that you can finally wind the transformer.
How many shunt regulators have you designed such way?
a lot of ways to make an amplifier....that is for sure...
you can make and amp and look for a suitable speaker,
or you can get a speaker and design an amp to use with that speaker...
stick to what you know, you do not need any advise...
and i wonder why the "advice needed" in your thread title, you seem bent on proving those who answer you wrong...
just go and do your thing and show us what the end results of your musings turn out to be, that is more important.....see you at the finish line....
you can make and amp and look for a suitable speaker,
or you can get a speaker and design an amp to use with that speaker...
stick to what you know, you do not need any advise...
and i wonder why the "advice needed" in your thread title, you seem bent on proving those who answer you wrong...
just go and do your thing and show us what the end results of your musings turn out to be, that is more important.....see you at the finish line....
One of the goals of the forum is helping each others, if you post wrong information, as a forum member is my duty to correct you if I can, for the good of the community. 🙄
Indeed, I did obtain some advice in this thread
http://www.diyaudio.com/forums/tubes-valves/299317-ccs-6.html#post4902675
A lot of work to find it, but based on that I could make the calculations which apparently solved the mystery. 😉
Indeed, I did obtain some advice in this thread
http://www.diyaudio.com/forums/tubes-valves/299317-ccs-6.html#post4902675
A lot of work to find it, but based on that I could make the calculations which apparently solved the mystery. 😉
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