I hope your channel growth more. Your content is really well done. DIY amp builder myself and I've learned quite a bit in your video about the bias excursion etc...
This was very helpful to understanding what you're doing when building an amplifier. I've been thinking about doing that for quite a while, and haven't because I don't feel like I understand enough of what I'm doing to be able to accomplish that safely and effectively. I'm going to watch the rest of this series, and determine if I should buy a kit and assemble it. Thank you for sharing. (I'm not going to mention what amp I want to build at this point. It's just not going to be easy).
Great stuff, "Why" things work the way they do is just as important "How" to wire it all up. A video on a 3 way Baxendall tone-stack (or similar, Marshall Super-bass) would be amazing for us tone nerds, the way you describe each component and what their role is as you go along is your strong point. Thanks.
I am planning my first tube amp build, a 5F1 but with a Weber 12s Alnico.I expect it to have overly strong bass and don't want the breakup to begin until 6 or 7. Your video has taught me about how I can substitute different values to voice the amp besides coupling caps. Thanks A/Tech
You have a very clear way of explaining, so much so that even I as a complete newbie on the subject can get a good grasp of what is going on. Thanks and best wishes for the future of this channel from your 130th subscriber!
The grid leak resistor also acts to provide negative voltage to grid bias the tube. The grid biasing on this circuit is indeed “creative”. I’d like to what the grid bias voltages are.
This particular amp is cathode biased, so the grid leak is not exactly part of the bias circuit per-se, such as a fixed bias amp would be. The grid leak is a required part of any tube circuit regardless of function. It serves as the reference for the grid to ground, and acts more or less as a volume control and as a load to the preceeding stage. A voltage is formed around this resistor, and one could call it bias, as it does serve this function to a degree. In the case of a fixed bias stage, the grid leak really only provides a reference point, controls current flow and keeps the bias under control. It cannot be too large, or the bias will " run away " within the tube, and it cannot be too small, or the tube will shut off and no longer conduct. In a cathode biased stage, the difference between ground for the cathode and the grid is what creates the bias. This is in relation to the plate voltage of course. Change the plate voltage, and the bias will shift along with the operating point of the tube. It si all about creating a " window ". There is an area, where this window works best, given the plate voltage you are working with.
It is a very good explanation, but you got one thing wrong: A standard amplification stage with output at the anode will always reverse the phase 180 degrees. That can be important when you later want to mix different signals. You need to be aware of the phase. I once build a clone of a Marshall 18w with reverb, and found out that the reverb signal and the source signal were out of phase - that didn´t sound good.
I didn’t t really touch on phase at all. I just said the output would be a bigger version of the input. Which clarifies nothing of course. However, yes you are correct that the basic triode stage will invert the signal. My drawing does incorrectly show the wave as it relates to in and out. I wasn’t really focused on that part of things as much as I was trying to get all the other data out. Thanks for pointing that out though, because it does matter
Σας ευχαριστώ για τον απλό και κατανοητό λόγο σας, και που εξηγείτε πως λειτουργεί κάθε εξάρτημα σε έναν ενισχυτή. Επιτέλους λίγο φώς. Λυπάμαι που μου πήρε 2 χρόνια για να το βρω. Έχω μία ερώτηση να σας κάνω, που ίσως είναι περίεργη και πιθανός εκτώς θέματος : Θα μπορούσε ένας HiFi ενισχυτής (σαν τον Mullard 5-10 σε έκδοση elektor's 10W tube amp) να χρησιμοποιηθεί ει σαν final stage μετά την προενίσχυση και επεξεργασία του σήματος από τις 12AX7? Ευχαριστώ και συγνώμη για τα ελληνικά μου.
Δεν υπάρχει τίποτα ιδιαίτερο στον ενισχυτή Mullard 5-10 που να χωρίζει από οποιονδήποτε άλλο ενισχυτή. Έτσι, θα μπορούσατε σίγουρα να το χρησιμοποιήσετε με οποιονδήποτε επιθυμητό προενισχυτή. Το τμήμα του ενισχυτή ισχύος χρησιμοποιεί απλά ανεξάρτητα καλύμματα παράκαμψης καθόδου και αντιστάσεις πόλωσης. Θα μπορούσατε να το κάνετε αυτό και με άλλες κατασκευές μεροληψίας καθόδου. Το Mullard 5-10 είναι μια ανερχόμενη τοπολογία ενισχυτή κιθάρας νομίζω. Υπάρχουν πολλά νήματα που μιλούν για αυτό ως σημείο άλματος ενισχυτή κιθάρας. Αυτό μεταφράστηκε με το Google Translate, οπότε ελπίζω να έχει νόημα?
Hello Theoretically speaking, would it be possible to build a tube amp that would have 50 watts or more? If so, what components would increase the wattage? Thank you
As a single ended amp, much above 30 watts is going to be tough. KT88's are about teh only tube readily available that can get you there and beyond, but you have to scale voltage with it. It is not always practical to design an amp with a wattage in mind utilizing specific parts. When you start going with push-pull/class-ab designs, you can easily push beyond 50 watts if desired.
Need is a strong word ;) most amps use it as a tone shaping tool, not for safety. I generally shoot for as few number of parts in the signal chain as possible. If you have to shape the sound before it even hits the first stage, then what are you doing it for?
Not new? What kind of comment is that? I can't believe you actually spent time to write that comment and actually pressed the post button. Bet you feel real good.
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I hope your channel growth more. Your content is really well done. DIY amp builder myself and I've learned quite a bit in your video about the bias excursion etc...
This was very helpful to understanding what you're doing when building an amplifier. I've been thinking about doing that for quite a while, and haven't because I don't feel like I understand enough of what I'm doing to be able to accomplish that safely and effectively. I'm going to watch the rest of this series, and determine if I should buy a kit and assemble it. Thank you for sharing.
(I'm not going to mention what amp I want to build at this point. It's just not going to be easy).
Finally someone explaining how this works, thoroughly and clearly! Thank you!
I really appreciate the detailed explanation you give in this video! Thanks so much, and I look forward to continuing this series.
This is fantastic information....Really clear explanations of the functions of the components. It is greatly appreciated!
Great stuff, "Why" things work the way they do is just as important "How" to wire it all up. A video on a 3 way Baxendall tone-stack (or similar, Marshall Super-bass) would be amazing for us tone nerds, the way you describe each component and what their role is as you go along is your strong point. Thanks.
I am planning my first tube amp build, a 5F1 but with a Weber 12s Alnico.I expect it to have overly strong bass and don't want the breakup to begin until 6 or 7. Your video has taught me about how I can substitute different values to voice the amp besides coupling caps. Thanks A/Tech
Go for it!
You have a very clear way of explaining, so much so that even I as a complete newbie on the subject can get a good grasp of what is going on. Thanks and best wishes for the future of this channel from your 130th subscriber!
Thank you so much for breaking this down
The grid leak resistor also acts to provide negative voltage to grid bias the tube. The grid biasing on this circuit is indeed “creative”. I’d like to what the grid bias voltages are.
This particular amp is cathode biased, so the grid leak is not exactly part of the bias circuit per-se, such as a fixed bias amp would be. The grid leak is a required part of any tube circuit regardless of function. It serves as the reference for the grid to ground, and acts more or less as a volume control and as a load to the preceeding stage. A voltage is formed around this resistor, and one could call it bias, as it does serve this function to a degree. In the case of a fixed bias stage, the grid leak really only provides a reference point, controls current flow and keeps the bias under control. It cannot be too large, or the bias will " run away " within the tube, and it cannot be too small, or the tube will shut off and no longer conduct. In a cathode biased stage, the difference between ground for the cathode and the grid is what creates the bias. This is in relation to the plate voltage of course. Change the plate voltage, and the bias will shift along with the operating point of the tube. It si all about creating a " window ". There is an area, where this window works best, given the plate voltage you are working with.
You would do well by describing the bias circuitry and path, and separately describe the signal path, circuitry and impedances.
It is a very good explanation, but you got one thing wrong: A standard amplification stage with output at the anode will always reverse the phase 180 degrees. That can be important when
you later want to mix different signals. You need to be aware of the phase. I once build a clone of a Marshall 18w with reverb, and found out that the reverb signal and the source signal
were out of phase - that didn´t sound good.
I didn’t t really touch on phase at all. I just said the output would be a bigger version of the input. Which clarifies nothing of course. However, yes you are correct that the basic triode stage will invert the signal. My drawing does incorrectly show the wave as it relates to in and out. I wasn’t really focused on that part of things as much as I was trying to get all the other data out. Thanks for pointing that out though, because it does matter
Σας ευχαριστώ για τον απλό και κατανοητό λόγο σας, και που εξηγείτε πως λειτουργεί κάθε εξάρτημα σε έναν ενισχυτή. Επιτέλους λίγο φώς. Λυπάμαι που μου πήρε 2 χρόνια για να το βρω. Έχω μία ερώτηση να σας κάνω, που ίσως είναι περίεργη και πιθανός εκτώς θέματος : Θα μπορούσε ένας HiFi ενισχυτής (σαν τον Mullard 5-10 σε έκδοση elektor's 10W tube amp) να χρησιμοποιηθεί ει σαν final stage μετά την προενίσχυση και επεξεργασία του σήματος από τις 12AX7? Ευχαριστώ και συγνώμη για τα ελληνικά μου.
Δεν υπάρχει τίποτα ιδιαίτερο στον ενισχυτή Mullard 5-10 που να χωρίζει από οποιονδήποτε άλλο ενισχυτή. Έτσι, θα μπορούσατε σίγουρα να το χρησιμοποιήσετε με οποιονδήποτε επιθυμητό προενισχυτή. Το τμήμα του ενισχυτή ισχύος χρησιμοποιεί απλά ανεξάρτητα καλύμματα παράκαμψης καθόδου και αντιστάσεις πόλωσης. Θα μπορούσατε να το κάνετε αυτό και με άλλες κατασκευές μεροληψίας καθόδου. Το Mullard 5-10 είναι μια ανερχόμενη τοπολογία ενισχυτή κιθάρας νομίζω. Υπάρχουν πολλά νήματα που μιλούν για αυτό ως σημείο άλματος ενισχυτή κιθάρας. Αυτό μεταφράστηκε με το Google Translate, οπότε ελπίζω να έχει νόημα?
Hello
Theoretically speaking, would it be possible to build a tube amp that would have 50 watts or more? If so, what components would increase the wattage?
Thank you
As a single ended amp, much above 30 watts is going to be tough. KT88's are about teh only tube readily available that can get you there and beyond, but you have to scale voltage with it. It is not always practical to design an amp with a wattage in mind utilizing specific parts. When you start going with push-pull/class-ab designs, you can easily push beyond 50 watts if desired.
Need a decoupling capacitor on the input 👍
Need is a strong word ;) most amps use it as a tone shaping tool, not for safety. I generally shoot for as few number of parts in the signal chain as possible. If you have to shape the sound before it even hits the first stage, then what are you doing it for?
STudy Dumble tech, its ALIEN, the guy was AB GENIUS................. ive delved into the black box mojo for over 20 years n STILL find stuff......
You have not gone over anything new
There is not much new to tube design 🙂.
Not new? What kind of comment is that? I can't believe you actually spent time to write that comment and actually pressed the post button. Bet you feel real good.