Well, you can keep searching for info and trying things until you you find a solution or have exhausted willingness to keep trying. Alternatives might be: (1) a reinstall of Windows with all that entails, or maybe (2) a version of windows running in a VM just to try out this tube design program. MS wants you to have a license for each OS even if it is virtual, but you could try running a guest OS for a month or whatever the time limit is for free and see how good the tube program is.
Or I do as said before and get a ride over to the storage unit and get my Windows XP. Less intimidating knowing someone who can most certainly figure out what causes the occasional blue screen of death. She is a great computer, just quirky like me. 😛
As I am typing this, waiting for the restart. Starting with removing x86 first, curious to know otherwise deleted it all, can't keep waiting 15 minutes for every restart. If doesn't, then I will. Buhahaha.
Here is the link: https://www.diyaudio.com/community/threads/selecting-capacitor-s-and-resistor-s.395498/post-7267222
Now says I did some other stuff besides with computers, in case the updated section was not clear. Not that its something to belabor, only trying to be clear if you need me to be.
Neither can I. Can't remember the last time I used the television.
Ditto:
Teaching myself tailoring, including drafting my own patterns (very easy and get far better results). Feels great having underwear and other clothes that fit my unique figuration.
Learning upholstery though online class.
And rebuilding a Volkswagen air cooled engine, 1200cc 40HP (did a 1600cc with FI before).
Yet I want to take on more...
While waiting on the computer, did some research and seems the feedback loop doesn't have any DC voltage. So did I misunderstand?
Think this sums it up the best:
https://el34world.com/charts/currentflow.htm
Think this sums it up the best:
https://el34world.com/charts/currentflow.htm
If an OPT is in the only feedback loop then DC voltages can't part of that, since a transformer can only pass AC. Nonetheless, the output tubes still have a quiescent DC operating point, its just not a parameter regulated by the overall AC feedback loop. However the output tube operating point may be still regulated locally to some extent by cathode feedback/degeneration.
Still getting the error. Another reason to hate Windows 7, clearly poorly executed. Time to go back to XP for computer programs that can't be run on Macintosh OS.
How does this information determine if the C8 and R16 values are correct and the amplifier can be built?
How does this information determine if the C8 and R16 values are correct and the amplifier can be built?
If you use a different transformer its not necessarily just R16 and C8. You may be able to select those to prevent oscillation, but you want this thing to sound good too, right? Like the real deal, or maybe if you are lucky maybe a little better than original? How to you get the sound right is the next question after stability. For that next question you have understand the whole circuit. You aren't even close to being there yet, and its far too complicated for one post. For that we need to get you to where you can read and really understand some books, articles, and well informed threads on tube amp design. When you get your Merlin Blencowe book, you can start with that. If you want to get to that point where you need to be, we are willing to help. If you don't want it then that's fine too. However, you need to understand that it took people years to understand how to design these old tube amps and make the sound especially good.
Please define different.
In other words, is the opposite of different a 8kΩ PP ultra linear 43 percent per the schematic?
I know 100 percent I can.
Of course.
It will be better than original. Hint, magnetics.
Thank you.
Why I do not want to make any changes to the schematic except maybe years down the road try DC tube heater supply as a curiosity. This includes changing C8 and R16. Now if can be shown without a doubt (mush preferably with image of model or a picture of oscilloscope screen) then let's get it changed and corrected to a value that takes it from an oscillator to an amplifier. Speaking of which, there is this:
"If, when we sum it with the input, it causes the gain of the amplifier to increase, then it is known as a positive feedback, and this is the basis of oscillators. If it causes the gain to fall, then it is known as a negative feedback, and this technique is widely used in audio amplifiers.
[...]
A = A0 / (1+ βΑ0) [Book states no other equation.]"
Don't have more time tonight, but what they usually forget to tell you about that equation is that it assumes β is unilateral. Its an approximation that can work pretty well in some cases, and not so well in other cases. When you know Kirchhoff's Laws well enough, you should be able to derive that equation.
I also need to call it a night.
That isn't happening, as you pointed out, I can't do it anymore. Besides, an oscilloscope does much better as provides an actual, rather than, hypothetical value and better, provides a visualization (the square wave starting curve per @grovergardner 's instructions).
Maybe now think about it, maybe there lies the difference, you are of a time before oscilloscopes and/or see better with equations than those who see better with an image visual.
@Adriel this thread is nonsensical. We are 232 posts into a discussion of 'which capacitors and resistors'. 10 posts would be excessive.
@Markw4 the best teachers I ever had were not the most brilliant people, but were people who had had to work hard to study their subject, and were sympathetic to the complexities.
I wish Adriel could jump into a time capsule, go back 1 month or however long it has been since he joined here, then for him to Google and read a bit more about his basic requirement: He wants to build a tube amp.
When I did that I saw references to kits, rebuilds, beautiful scratch built designs, and buying a PCB and starting that way. I read the threads of people who had the same desire as me, and ended up seeing some references to Tubelab SPP. I looked at the website, and I read the threads on Tubelab's forum here, and then I decided to take the plunge. I bought all 3 of George's boards since they had to be shipped to Europe, and for the outlay I hoped I would build each variant eventually.
The usual sucker punch for noobies, like I was then, is that there is no real way out of paying a chunk of money, especially with new parts. Transformers cost, and so do the tubes. This is where buying second hand and vintage can help, but you have to walk before you can run. Besides, the things that cost the most money can be reused in different designs as you get drawn more and more into this most amazing amalgam of music and technology.
I researched a bit about the parts, started to seek some specific advice on the Tubelab forum, and was ready with my purchase requirements. The best bang for buck for the OPTs were toroids from Toroidy, and I do no those are available in The States from TME.EU. The passive components were just about the minimum cost of a free delivery from Digikey, and I slipped a heavy item into that - the Triad choke.
The great thing about George's Tubelab forum is that they cut through the crap. Everything is solvable, and the real threat to progressing is overthinking it. You really have to just get on with it. As long as you take the safety precautions seriously, and methodical with the important steps (connecting the peripherals) then it is unlikely that you will break anything expensive. Tubes circuits are simple and the tubes are robust. There will be flashes from a slipped probe, and whisps of smoke from resistors, but if you keep focused then you are fine. (Variacs help too, IMO).
Power transformer was also a toroid from Toroidy, but other cost effective options for that exist. The tubes were a set of Russian 6p14p-ev (auction site), a JJ GZ34 (Conrads, also the tube bases). and a couple of ECC81s (auction site).
I also had to go out and buy the tools, and that was one of my better bits of decision making. I bought a good quality temperature controlled soldering iron, quality long nosed pliers and wire cutters, quality desk vice for hold the work rigidly, and a variac (since I expected to be doing the hobby for some time). I also built a dim bulb tester as an exercise.
Then I had about as much fun as you can have with your clothes on building the board (all parts on one side), and mounting it on a board with the peripherals and experiencing music from the speakers.
Following that I re-made it in a better case, with everything I knew about making it safe, and that was my first foray complete.
Recently I have changed the layout on the board so that the tubes are on one side, and the passives underneath. I intend to mount it on a plate for a nicer case, The power transformer has seen other service too as I try and develop my skills in other directions.
I suppose it took me a year from telling myself 'I can do this!', until I finalised the first incarnation. I had a lot of crap in my life during that time, and I was very fortunate to be drifting off to sleep every night thinking about this hobby, instead of work and so on. This community here were very helpful, but it does pay to ask specific questions so that you get specific answers. You are already exposed to my biases about how to get your legs under the table, and it is the same with everyone else who responds to queries; we are by definition all independent thinkers and have our own opinions.
@Markw4 the best teachers I ever had were not the most brilliant people, but were people who had had to work hard to study their subject, and were sympathetic to the complexities.
I wish Adriel could jump into a time capsule, go back 1 month or however long it has been since he joined here, then for him to Google and read a bit more about his basic requirement: He wants to build a tube amp.
When I did that I saw references to kits, rebuilds, beautiful scratch built designs, and buying a PCB and starting that way. I read the threads of people who had the same desire as me, and ended up seeing some references to Tubelab SPP. I looked at the website, and I read the threads on Tubelab's forum here, and then I decided to take the plunge. I bought all 3 of George's boards since they had to be shipped to Europe, and for the outlay I hoped I would build each variant eventually.
The usual sucker punch for noobies, like I was then, is that there is no real way out of paying a chunk of money, especially with new parts. Transformers cost, and so do the tubes. This is where buying second hand and vintage can help, but you have to walk before you can run. Besides, the things that cost the most money can be reused in different designs as you get drawn more and more into this most amazing amalgam of music and technology.
I researched a bit about the parts, started to seek some specific advice on the Tubelab forum, and was ready with my purchase requirements. The best bang for buck for the OPTs were toroids from Toroidy, and I do no those are available in The States from TME.EU. The passive components were just about the minimum cost of a free delivery from Digikey, and I slipped a heavy item into that - the Triad choke.
The great thing about George's Tubelab forum is that they cut through the crap. Everything is solvable, and the real threat to progressing is overthinking it. You really have to just get on with it. As long as you take the safety precautions seriously, and methodical with the important steps (connecting the peripherals) then it is unlikely that you will break anything expensive. Tubes circuits are simple and the tubes are robust. There will be flashes from a slipped probe, and whisps of smoke from resistors, but if you keep focused then you are fine. (Variacs help too, IMO).
Power transformer was also a toroid from Toroidy, but other cost effective options for that exist. The tubes were a set of Russian 6p14p-ev (auction site), a JJ GZ34 (Conrads, also the tube bases). and a couple of ECC81s (auction site).
I also had to go out and buy the tools, and that was one of my better bits of decision making. I bought a good quality temperature controlled soldering iron, quality long nosed pliers and wire cutters, quality desk vice for hold the work rigidly, and a variac (since I expected to be doing the hobby for some time). I also built a dim bulb tester as an exercise.
Then I had about as much fun as you can have with your clothes on building the board (all parts on one side), and mounting it on a board with the peripherals and experiencing music from the speakers.
Following that I re-made it in a better case, with everything I knew about making it safe, and that was my first foray complete.
Recently I have changed the layout on the board so that the tubes are on one side, and the passives underneath. I intend to mount it on a plate for a nicer case, The power transformer has seen other service too as I try and develop my skills in other directions.
I suppose it took me a year from telling myself 'I can do this!', until I finalised the first incarnation. I had a lot of crap in my life during that time, and I was very fortunate to be drifting off to sleep every night thinking about this hobby, instead of work and so on. This community here were very helpful, but it does pay to ask specific questions so that you get specific answers. You are already exposed to my biases about how to get your legs under the table, and it is the same with everyone else who responds to queries; we are by definition all independent thinkers and have our own opinions.
Thus why I was just starting to feel frustrated. I have a tenacious personality, have been called a bulldog.
Only been a few weeks. Google is tricky as doesn't give all answers, sometimes have to ask a forum. 😉
I have been educated and have to make a decision: amplifier (which solve damaging speakers) or a BIB (which sound fantastic though maybe not get to a low enough volume with 75 watts driving them).
Mark stated any design would have to have every component evaluated with high level mathematics, so I been trying for eight pages to find out this information so could proceed on building an amplifier that didn't melt speaker cables and possibly set the place on fire. He said it is only a miracle some designs, like Tubelab, don't. I care a lot about the dogs, so a risk I have not been so keep on taking. Have I been mislead? I did ask you this at least once or twice before, got no answer (understandable because the implications was you had left, got no response even from the PM which that get me of the computer and diving in, 58 pages of eBay so far).
I am so glad you mentioned this, certainly seems wasn't clear headed and missed 230VAC is CT, not the total. Using PSUD (which doesn't offer a CLC for Macintosh users) I confirmed this, out of the capacitor get 325VDC (schematic says 350VDC, though supplies the EL84s with 325VDC, 25VDC over recommended).
I was considering Hammond as what Mouser offers. Any benefit going with Toroidy? I will look into it later, friend picking us up in a few minutes.
Also planned on the least expensive tubes in case mess something up.
Oh? I been on the fence about getting a nice one or a Walker. Guess splash out and go with the Japanese (brand name is escaping me, starts with a H).
Not exactly. My point was more like if you want to understand this circuit and how to get the best of it with a different transformer, you need to know about as much about it as the guy who designed the amplifier the first place. He probably had some training in theory, a lot of practical knowledge, and plenty of experience.
Besides that, other people have tried to explain that you should learn the same sorts of things first like you would learn first if you took an electronics class in junior college, night school, or university. You don't just bypass all that stuff when you know so little that until recently you didn't even know you need to use rosin core solder. There is so much you don't know, that you don't even know you don't know it.
Also, please let me point out something: There are people here who will tell you they started experimenting with tubes and high voltage, they made a few sparks, maybe got zapped one or more times, but, hey, they're still okay. No serious damage. And exactly the same type of thing for all other guys around here, we all got shocked but it wasn't bad and we're all here tell you so. The thing to consider is that the guys who got zapped and aren't here to talk about their experience because they're dead aren't part of what you will hear much about. So of course everybody here has had the same experience and is still okay.
This is not a correct approach. You come here and ask for opinions ... and you get dozens of them in return. Since you cannot evaluate the opinions yet, because you do not have any real world construction experience, it is just making you more and more confused.
I see you have now spawned another thread asking for opinions about OPTs, and the same merry-go-round of opinions starts all over again.
If you are getting a lump sum - I saw that you mentioned that elsewhere - why don't you buy a second hand amp? Learn to measure the voltages and be able to maintain it. Get the satisfaction now while building your competence with reading around the subject.
I appreciate you clarifying, thank you. 😀
What a shocking revelation. Terrible pun, deal with it. 😛 (I enjoy dark humor...)
Yes, I am well aware of the risk, very serious matter. So since an electrical wire can short and start a fire, should I turn off the electricity going to the house? California is due for a really big earthquake, maybe better to live outside. No, I might get struck by lightning. Phooey, there is no where safe and I am going to die.
After my appointment, stopped at the storage unit and got the XP machine. I saw the other computer there, kicking myself as now have to buy an adapter.... 😆
Well, despite my youth, I rarely use a computer, this has been more than I do in months. So I appreciate knowing this, thank you! 😀
Because I was tiring of asking over and over and over and over and over and over about an OPT, didn't get an answer from anyone.
A OPT has been recommended, das ist alles. I will take this to apply to selecting a schematic, stick with the L1, correct?
Did come across this, thus the question: http://diyaudioprojects.com/Tubes/EL84-Mini-Block-Amps/. No reply be taken as stick with the L1.
I will say for the third time: because end up with something that eat up money and do nothing.
Now hit me the other day, a FM tuner/receiver (sans amplifier) be nice to have, still has tubes and voltage. Lots of mono Heathkits and Magnavoxs under $50, though don't know how they behave with stereo application (probably split and feed the same signal into both sides). 🤔
I knew a guy who was an experienced senior tech working a field service engineer. He died one night working alone on a power supply.
Another guy I know is still alive. He woke on the floor and didn't have any memory of touching any thing inside the power supply. But the power supply safety covers were found removed, he had an entrance wound that looked like an electrical shock caused it, and the doctors found chemicals in his blood indicating heart damage. He was very weak and unable to work for a long time. Eventually he got better enough to work again, but don't know if he ever recovered fully.
I personally could have been killed a few times. I will spare you the details and just say I learned some valuable lessons and I was lucky. Don't think its rare any more than its rare to die in a car or motorcycle accident. It happens so often its not even considered news.
Another guy I know is still alive. He woke on the floor and didn't have any memory of touching any thing inside the power supply. But the power supply safety covers were found removed, he had an entrance wound that looked like an electrical shock caused it, and the doctors found chemicals in his blood indicating heart damage. He was very weak and unable to work for a long time. Eventually he got better enough to work again, but don't know if he ever recovered fully.
I personally could have been killed a few times. I will spare you the details and just say I learned some valuable lessons and I was lucky. Don't think its rare any more than its rare to die in a car or motorcycle accident. It happens so often its not even considered news.