Thanks. I just started to gather interest in the GB thread to see if i can gather enough value for a buy.
too much, too much iron, so many complications that sound has to go through...
So, ladies and gentlemen, have a good Sunday.
Last (in the sense i think it should be the last) upload of grunf's tube ccs stage, with pictures, schematic and a guide to run that thing.
Actually received many question so i thought it should be good to have a companion to let it work.
In case of other FA questions, i'll updated the guide.
Have fun and enjoy!
Last (in the sense i think it should be the last) upload of grunf's tube ccs stage, with pictures, schematic and a guide to run that thing.
Actually received many question so i thought it should be good to have a companion to let it work.
In case of other FA questions, i'll updated the guide.
Have fun and enjoy!
Attachments
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Gerber_AD1862_PSU_Tube_output_PCB_2024-06-15.zip
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Lets_wire_that_thang.pdf
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IMG_20240728_090414.jpg -
IMG_20240728_090205.jpg -
psu.png -
PCB_PCB_Tube_CCS_AD1862_1_2024-07-28.png -
Schematic_Tube_CCS_AD1862_2024-05-14.png -
Schematic_AD1862_PSU_Tube_output_2024-07-28.png -
Gerber_AD1862_Tube_CCS_Output_PCB_Tube_CCS_AD1862_1_2024-07-28.zip
I guess another Gerberis coming in the next days 😉
Would you share also your PSU?
That 6HM5 though... (ecc900 if i'm right)... something easier to find here in EU?
Wait, this stage is still inverting, what could we do with the cathodic buffer there?
4 tubes, wow, it begins to look like a real amplifier...
However, why do we need so much gain?
around 200V, may be 160V, may be 240V. Better around 200. At the plates, around 100V
Yes, the big 'mu' serves that purpose in this case, but the tube itself and its operating point which enables a sufficiently low Rk are also important.
The output stage with ECC88 is a white cathode follower and is better than the classic cathode follower. The output impedance is low enough to reduce the influence of the following stages so there is no need for an active preamp, a passive preamp is sufficient.
Nah it is my itching powder behavior.
It is a good chip and the interrest of being stereo has some interests. It is just I find the others of the thread better and deserving efforts. Of course if the game is to have many DACs it is ok. I have a K grade one. PCM1704 is not as good as all the others of the thread but of course if you listen all the day 24 bits materials.
At the end, but for the pleasure of benchmarking ic which has been made already, I find more interresting to spend monney on trying more a diminushing return tie and monney on two chips i: TDA1541A and AD1862.
Of course YMMV and it is fine.
There is a member from Vietnam here that made and sell the I/V pcbs.
Have you read this https://www.diyaudio.com/community/...st-tht-i2s-input-nos-r-2r.354078/post-7135489 ?
Did you see how much the transformers in Andrea's tube stage cost? ~~ $600 a pair USD! That is impractical for most people! Definitely too much for me!
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@audiosteve I agree entirely, not for me either. However, I'll be trying the simple tube stage by Grunf and Michelag, much easier 😉 Do you remember Lampizator? He was a hobbyist with a blog, now his tube dacs sell for $10,000. Quite a cult around these things.
I also remember Quanghau selling his kits years ago. Think I was building TPA Buffalo DACs back then. He designed a few epic DACs if I remember.
Is that Thorstens Paper? He's a genius.
I also remember Quanghau selling his kits years ago. Think I was building TPA Buffalo DACs back then. He designed a few epic DACs if I remember.
Is that Thorstens Paper? He's a genius.
I'll check those out. Grunf has a good reputation in my mind. The name lampizr rings a bell but I can't say I specifically remember anything about it or him. I do know that I consider myself an audiophile but a rational audio file. $10,000 for a DAC? That just borders on insane. Talk about ridiculous cost of diminishing returns. I'll bet it's a good DAC, but is it worth that kind of money? I seriously seriously doubt it. That kind of stuff is for people that have more money than brains.
you want a tda1541A that sounds good, just go on Audial and jump in the DIY edition called AYA5. well spent monney imo !
For TDA1541A, I just will go with the CD-77 tube stage @ThorstenL (aka M. T Loesh) had the kindness to publish in the log TDA1541A thread. Of course that certainly means more effort to source good tubes and also in the layout (@Michelag : resistors nearer of the tubes pins as already inputed 😉 ; change those wiresat the bottom by the resistors the way I said in a post above to avoid osci).
Of course CCS (Grunf) or Mu follower has interest as well. But first source the good tube (NOS) and match the ones that have too much difference between the two triodes... (russian ones have a lot of difference between the two internal triodes for illustration, but not only D3A(single triode) that are osci beast have a lot of difference between two tubes, you need matching effort which can become expenssive for the ones not havinng great stock... and don't let talk about chineese tubes (save your monney please with that alixpresse kits and bad layouts pcbs)
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