I dont think o know it all i think you think youDO know it all. In fact your review of the vox ac 30 is really incorrect. Its a class a amp. It burns up tubes quickly. Just as the single el34 powered amp i had rqn the tube wide open all the time. Ok? So what you are insulting me with is not enrtirely true. Maybe if you had more actual experience with living with the different tube amps you might know more than theory. A phase inverter causes an inversion of the out put signal to be 180° out of phase. Thus using one 6L6 in a two 6L6 circuit for an on phase output signalfor 1/2 the output and the other to do the second half of the output work. Thus only using 1/2 the tubes output and burning the heater or filament 1/2 or less as hot to produce more power. Now, tell me all about class D amps and how they operate. Ok? Sorry this probably about the 9th time ive been through this with an "expert" and im thinking we are on the same page with a different path to the truth and i dont appreciate being told i dont know something that i do in fact know and just dont have the pretty words to explain. Ok?
No, actually if you were to understand how the output stage of the AC30 worked, you would easily discover why it's not a class A amp. I actually have a lot of experience with this topology, and have designed amps using modified versions of it.
Here's a technical description that also includes the discussion of conduction angle:
Is the Vox AC-30 Really Class A?
Your understanding of filament voltage/current has no relationship to any reality that I am aware of. It just doesn't work this way.
Your discussions show crystal clearly that you don't even understand the basics of how this stuff works, and obviously you are way too stubborn to consider that some of us here who have both the education AND the experience designing these very amps just might understand what they are saying. Yeah, really. If you understood it, you could explain it factually and without violating the basic laws of science and physics.
So the mesa boogie power circuitry or topological design has been discontinued? Thats very bad. I will now be advising people there are no decent bass amps for sale with decent performance below 4,000$ tell mesa thats very bad for all of us. There is however a very good circuit using mosfets from eden/david/nemesis that has very good tone for a transistor amp. Thatnks. Sorry mesa killed an amazing amp line.
Yes, the WA and Carbines have been on the market for over 10 years and it's time to move onto something different. There are PLENTY available on the used market, and there are folks who are finding that some of the newer amps (including class D) to be a better fit for their current needs. If that doesn't work for you, then please feel free to explore other options offered by different companies. Trust me, we won't be in the least bit offended.
Where can I find this very valuable information?
I believe it was discussed in the walkabout Megathread, as well as here:
Mesa Just Killed the M6, M9, And Walkabout amps.
I'm not positive, but I swear I read about a tube bass amp that had a switchmode PS.
Though in hindsight, I think whomever posted that thought a toroid meant it was switchmode.
God, imagine if you could get your SVT or Bass 400 retrofitted with a swtich mode PS?
Then it would only weigh half a ton!
Indeed, there have been a few SMPS based tube amps manufactured, they also exist in the broadcast transmitter and industrial fields. Going from memory, I think both Peavey (VB-3) and Crate (V-50???) had one for a while.
