WHY YOU LOVE IT SO MUCH EP 02
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- čas přidán 16. 03. 2023
- In this episode, we look at the Marshall JCM-800. Want to see and learn a little bit more about it? Stick around and you'll see why it's one of the most famous amps in the world.
Duncan Tone Stack Calculator: www.duncanamps.com/tsc/
Rob Robinette: robrobinette.com/How_the_Mars... - Hudba
I️ just bought the parts yesterday to build something along the likes of a JCM 800! Great timing! You’ve got a great way of explaining how all of this works!
Your channel magically appeared in my YT feed yesterday.. Man, where has this channel been the past few years that I have been trying to teach myself to build tube amps. Great stuff.. the best I've seen. Looking forward to going through everything you have posted and also looking forward to more. Where'd you get that schematic?
Wow, thank you!
They are all on the web, just do a search of XYZ schematic.
Nice vid;
I too have never much liked the sound of the cathode follower->tone stack, so I've never paid them much mind. I do enjoy the sound of the JCM800, but have never wanted to own one. 🙂
Not having had the need to deal with cathode followers, I've never bothered to think about them much. So.....
How is it that the grid of V2b (cathode follower) is ok seeing the 192V DC that is powering the plate of V2a with no coupling cap? What am I missing?
I've seen other cathode follower circuits that are configured differently and do require coupling caps. Again; what's the science with this circuit?
👍👍
Man, I’d like to see a vid with you discussing the circuit differences between the 2204/2203 and the copied versions….peavey butcher, Laney pro tube, etc…..🤘🏼
I will add those to my list.
Hello frend. Do you have any video that explains how the resistors working the G1 and G2 bars? of EL34 tubes ? tips for KT77 or 6550/KT88. Thank you Frend.
I do not specifically. But will add that to my to do.
@@atech9020 Thank you.
Awesome video! Question: how do cathode followers work with respect to electron flow? Normally electrons flow from the cathode to the plate and exit there. How do they originate and exit at the cathode? What purpose do the grid and plate have? Thanks!
I think you’re mixing up the two types of voltage that are on the tube. The DC still works like you suggested. The difference is the AC signal will exit the cathode instead of the plate and then be passed to the grid of the next tube. Also, when, using a cathode follower, the AC signal will be unaffected, where typically the AC signal would exit the plate before going to the next stage and would be flipped inverse.
@@ManuelSurgenor no I was talking specifically ac signal voltage. Tubes are diodes where electrons only move in 1 direction-cathode to plate. So how does the signal on the grid travel in reverse to the cathode? And what purpose does a positively charged plate have in this situation?
@@TheLamboman640 what I said above still stands. The electron flow from the cathode still boils off to the plate like you mentioned. The incoming AC signal can then be sent out of the plate of the tube on to the next stage, or it can be sent out through the cathode to the next stage. It really comes down to which side of the tube that you place the coupling cap on to go to the next stage. You can couple the next stage from the plate or the cathode of the previous tube. If you notice on a cathode follower, you’ll see a coupling cap on the cathode to pass AC. The DC powering the tube is still B+ on the plate and ground on the cathode, but the AC signal can pass through either end of the tube or both in some types of phase inverters.
@@ManuelSurgenor I understand everything you said, the only part that hangs me up is how the signal can exit the cathode when its a diode… electron flow is only going from cathode to plate. There is nothing traveling from the plate or grid to the cathode.
@@ManuelSurgenor even with a coupling cap on the cathode, there is still the B+ on the plate attracting electrons from the cathode to the plate thus having only 1 direction of electron flow. How do electrons enter the tube at the cathode and also exit at the cathode?
When you see a typical - do you mean normal or abnormal? Or not miraculous as to say, that it is something one you should expect. Other than that I appreciate the explanation of the amp.
A-typical to me means, normally, regularly, consistently, or commonly.
@@atech9020 maybe put a pause between saying the 2 words 'a' and 'typical' as there is a word 'atypical' which means the opposite of typical. The as a single word, 'a' part negates the meaning, eg as in asymmetric. You do sound like you are saying 'atypical' ie the opposite of typical, kind of confusing.
@@atech9020atypical means literally the opposite of what you are saying.
@@LeviBulger yes, we went over this already. Has been fixed.