300V SMPS - has anyone tried these?

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Tubaholic
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300V SMPS - has anyone tried these?

Post by Tubaholic »

I bought a 300VDC+ 6.3V DC switch mode power supply from Ali Express . It claims 0.6A at 300V, plus 4A at 6.6V. I've tested it with a resistor load and it seems to deliver up to about 220mA.

Has anyone tried one of these power supplies in an amp?
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250W Vacuum Tube Amplifier Machine Switching Power 300V 0.6A 12.6V 4A 6.3V 4A 110V 220V AC TO DC Switch Power Voltage Conversion - AliExpress 1420.pdf
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Re: 300V SMPS - has anyone tried these?

Post by jeremyb »

Blackstar are using switchmode power supplies in their St James range of amps, looking at how complicated the thing is from these gut shots: https://www.tdpri.com/threads/blackstar ... s.1127196/ you'd almost wonder if the tubes were there for show :lol:
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Re: 300V SMPS - has anyone tried these?

Post by MikeC »

Tubaholic wrote: Sat Jun 29, 2024 10:11 pm I bought a 300VDC+ 6.3V DC switch mode power supply from Ali Express . It claims 0.6A at 300V, plus 4A at 6.6V. I've tested it with a resistor load and it seems to deliver up to about 220mA.

Has anyone tried one of these power supplies in an amp?
Compared to a PT & rectifier this is cheap enough to experiment with. But it would be better with 400V or more DC.
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Re: 300V SMPS - has anyone tried these?

Post by jeremyb »

MikeC wrote: Sun Jun 30, 2024 9:05 am
Tubaholic wrote: Sat Jun 29, 2024 10:11 pm I bought a 300VDC+ 6.3V DC switch mode power supply from Ali Express . It claims 0.6A at 300V, plus 4A at 6.6V. I've tested it with a resistor load and it seems to deliver up to about 220mA.

Has anyone tried one of these power supplies in an amp?
Compared to a PT & rectifier this is cheap enough to experiment with. But it would be better with 400V or more DC.
What could you build with 300V? maybe like a champ or tweed princeton kinda thing?
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Re: 300V SMPS - has anyone tried these?

Post by MikeC »

jeremyb wrote: Sun Jun 30, 2024 9:23 am
MikeC wrote: Sun Jun 30, 2024 9:05 am
Tubaholic wrote: Sat Jun 29, 2024 10:11 pm I bought a 300VDC+ 6.3V DC switch mode power supply from Ali Express . It claims 0.6A at 300V, plus 4A at 6.6V. I've tested it with a resistor load and it seems to deliver up to about 220mA.

Has anyone tried one of these power supplies in an amp?
Compared to a PT & rectifier this is cheap enough to experiment with. But it would be better with 400V or more DC.
What could you build with 300V? maybe like a champ or tweed princeton kinda thing?
And EL84 amps, Vox stuff
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