Electronics > Projects, Designs, and Technical Stuff
SMPS for vacuum tube power amplifiers.(status: back at it)
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chris_leyson:
Well done, a really neat idea to get the weight down  :-+


--- Quote ---Unsafe..well there aint nothing safe on 450V of DC with about 60W of power backing it
--- End quote ---
Know what you mean. If I'm powering up a small off line 15W flyback design for the first time I use a small 24V to 500V flyback set to something like 325VDC and drive it from a bench supply limited to < 50W. At least that way there are no fireworks and breakers don't get tripped if shit does go haywire.
One tip, put bleed resistors across the HV bulk storage caps and maybe a small neon indicator lamp as well. Simple reason is that if my off line flyback doesn't start up for whatever reason then there is nothing to discharge the bulk storage cap, apart from me and that is usually followed by an expletive. Always double check things and if in doubt just put a meter across anything that could be hot, play safe and enjoy.
SK_Caterpilar_SK:

--- Quote from: chris_leyson on March 29, 2019, 11:17:41 pm ---Well done, a really neat idea to get the weight down  :-+


--- Quote ---Unsafe..well there aint nothing safe on 450V of DC with about 60W of power backing it
--- End quote ---
Know what you mean. If I'm powering up a small off line 15W flyback design for the first time I use a small 24V to 500V flyback set to something like 325VDC and drive it from a bench supply limited to < 50W. At least that way there are no fireworks and breakers don't get tripped if shit does go haywire.
One tip, put bleed resistors across the HV bulk storage caps and maybe a small neon indicator lamp as well. Simple reason is that if my off line flyback doesn't start up for whatever reason then there is nothing to discharge the bulk storage cap, apart from me and that is usually followed by an expletive. Always double check things and if in doubt just put a meter across anything that could be hot, play safe and enjoy.

--- End quote ---

Yeah thanks. Im planning to series 2x450V caps so the bleeders will be the balancing resistors themselves. The reason why I want to series them is to raise the voltage capability. Running a 450V single cap at that voltage can be little too close to the danger zone. If something goes oh shoot and the voltage shoots up into the sky, fireworks are expected..or at least a mist maker.
chris_leyson:

--- Quote ---Do away with the power transformer altogether and go with good old school hot chassis.
--- End quote ---
  :scared:

That reminds me, I've been looking for a small HV transformer to retrofit to a old DAC90 receiver, two reasons, it's safe and I get rid of the hot dropper resistors. Haven't found anything that will fit yet.
SK_Caterpilar_SK:
On the left side is the PCB of the tube amplifier. On the right is the HV converter.

Just a showoff of the working 10-30Vin converter module
chris_leyson:
Nice  :-+
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