Yep all SMPS allowing the tubes to get 200v (and whatever voltage 12ax7 types get)So, is he running some kind of internal voltage convertor? Because plate voltage on those 6N21B tubes is supposed to be 200v and running at 12v is going to make them act more like transistors than real tubes (see Butler Tube Driver for an example).
It’s very similar to how Kingsley pedals are powered. That way the pedals don’t need a separate AC supply. Just enough miliamps in DC.Sorry, took me a minute to figure out SMPS meant switched mode power supply. 12AX7s should also get 170-200v... Of course, they tend to get pretty warm at that rate?
I am sure he would build a one-off for you if you said please lolThere was an Ambassador someone was selling locally but it was overpriced. Sushibox said I could get one in 2-3 months, so when the seller eventually wanted to meet me at my asking price, I decided to wait for the builder.
Bad move cause sushibox shifted cities, then would no longer build the Ambassador. He did however say he'll make a Vox or Matchless preamp one day, so I'll wait out for that!
Wow. Very cool. The Alembic F2B was a huge part of Gilmour's various rigs for a few decades. Gilmourish goes into some nice detail, typos and all! While people always think Hiwatt first, it's interesting to note where and how DG utilized the F2B in his setup, especially driving rotating speakers. Being the BF Showman circuit, it's basically a nice, clean BF Twin preamp, but without reverb or tremolo.His thing is using the subminiature 6N21B tubes instead of the typical 12a*7 tubes. They're rated around 70-80 in gain range, I believe, so closer to a 5751 tube in terms of gain range.
He does also build pedals that used 12ax7, but the subminiatures allow for the pedals to be much smaller format.
They run either 9volt or 12volt depending.
I have 2 that he made me with one in the works.
The first one is called the Particle Accelerator and is based on the Alembic F2B which is the preamp section (without tremolo and reverb) of a Fender Blackface Showman. This one uses a single 6N21B. It was also modded so that instead of having a mid control there is a switch that will go between 2 different fixed midrange settings.
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I also have a custom one he made that called the Tachyon Prototype (trying to follow the Sci-Fi theme). It is a monster. It is the Clean and Drive channels of an Orange Rockerverb amp. It packs in 3 6N21B's and has an insane amount of gain range.
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The one in the works is a Particle Accelerator that uses a 12ax7 and has modifications to the tone stack. I will post some pics of it as soon as its finished
I just found this thread. Pedals look really clever. I've very curious to see if/when you try a Vox circuit or two.Man, I haven't logged on here in forever, sorry for not jumping in to answer questions, I'll try to be better about that. It seems like most of my builds lately have been for bassists so I spend a lot more time on Talkbass.
I'm starting to get away from 6N21B tubes and more into 12AX7 because it's more sustainable, easier for customers to swap tubes if something were to go wrong, and they use less power. Also they don't have to be 12V, all of my 12AX7 pedals will run on 9V as well. I regulate everything internally (like megatrav said) to run 200V (usually 220V for 12AX7) to the tube plates. I've never cared for the starved tube sound.
So a Matchless preamp pedal is still on my to-do list, I'm hoping to get to it soon, but I also build 40 pedals a month so I have to balance my time between keeping up with orders and developing new projects. Unfortunately with my current build volume (and my full-time job, and my family) I don't really have time for one-offs, but I am always open for suggestions for new designs.
And again I'll try to be on here more, so feel free to hit me with any questions you have