Electronics > Projects, Designs, and Technical Stuff
SMPS for vacuum tube power amplifiers.(status: back at it)
SK_Caterpilar_SK:
Heres the finished thing. Only the bottom PCB view for the SMPS. .
SK_Caterpilar_SK:
And some tube goodness. Warm orange glow with some blue powdery accent to it on the inside of the power pentodes.
SK_Caterpilar_SK:
Heres another look at one of the power pentodes.
SK_Caterpilar_SK:
And the last one.
Zero999:
--- Quote from: SK_Caterpilar_SK on March 29, 2019, 11:00:38 pm ---
--- Quote from: Zero999 on March 29, 2019, 10:50:35 pm ---Do away with the power transformer altogether and go with good old school hot chassis. This sounds dangerous, but it needn't be: the inputs and outputs can be coupled with transformers, with sufficient isolation for mains use.
--- End quote ---
Now that is what engineers were thinking of when they were designing all american 5 and 6 radios. Make the chassis hot or not- aint a good idea if you want the thing to be showed of not just working. And if you want a metal enclosure for the thing to make it premium looking.
Now I would use a 3 wire plug anyways. But ground loops are still gona persist as an issue, and isolating the output from the input mains seems to logical since you dont want to spend tons of money for tranformers that will put your sound into the amplifier, afterall the catch of a tube amp is its high input impedance. Your solution, is not what Im after.
--- End quote ---
If input impedance is an issue, you could also use a low power pre-amplifier before the transformer, which would only need a small power transformer. Another possibility is to have a differential input stage for the valve amplif and couple the signal via Y-rated capacitors, which are safe to connect between the mains and exposed metalwork or a low voltage signal.
I knew you wouldn't like my suggestion, but that was the point. I personally like your project, but as mentioned above, many thermionic purists won't. The fact that it sounds the same and the oscilloscope output is identical doesn't matter. It's phycological. If I told you it's possible to use digital signal processing to make an amplifier with exactly the same characteristics as a one with glowing filaments, would you be interested? Probably not. Many people like old technology. This is no different to steam enthusiasts vs those working on cutting edge electric locomotives.
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