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Kanged switching power supply for a tube amp.
Kanged switching power supply for a tube amp.
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Old 10th October 2018, 08:49 PM   #11
glasswatts is offline glasswatts
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With the 500 watt inverter board, what are you doing for rectification? I would think run of the mill diodes would overheat due to the 20kHz output and the diodes recovery time.

Some eBay feedback suggests that 17-20 VDC input is needed to realize the full rated output with these. Are you able to vary the output voltage by varying the input voltage?
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Old 11th January 2019, 05:20 PM   #12
Tyimo is offline Tyimo  Hungary
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Hi Koda!

The DC-AC Converter 12V to 110V 200V 220V 280V 150W Inverter is not clear to me. It says the "Output Wave Form: high frequency square wave or DC(un-filtered)" Has it 280Vac and 280Vdc or 280x1.41=394Vdc??

Another question: they recommend to use the DC Output. ( because normal electric units are using normal rectifier. If connected to the "High Frequency AC Output", rectifier will heat up fast and damaged, diode will be destroyed.) Do you use the DC output?

greets:
Tyimo
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Old 11th January 2019, 08:39 PM   #13
kodabmx is offline kodabmx  Canada
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Kanged switching power supply for a tube amp.
No. It's square wave. 280VDC = 280AC because of 50% duty cycle.

I use either. What they really mean is "This switches at 37kHz, and will burn out standard rectifiers used for 60Hz." I use UF or HER series diodes when I use the AC output, and that is only when I use it as a voltage doubled output (220x2=440V because it's square wave).
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Old 12th January 2019, 07:22 AM   #14
Tyimo is offline Tyimo  Hungary
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Thanks!
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Old 9th August 2019, 03:40 AM   #15
plasnu is offline plasnu  United States
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I wonder if this works fine for my purpose.

70W DC 12V 24V to 200-450V 380V High Voltage Boost Converter Step Up Converter | eBay

I'm about to test a tube gain stage for Mofo (FET follower amp with 24V 10A SMPS, popular amp in Pass labs forum). I would like to try different tubes before buying a real power transformer, so variable voltage is a big advantage for me. I also wonder about HV converter compared to conventional linear supply, in terms of sound, noise and safety. I'm hoping HV converter will work fine, and I don't have to build separate linear PSU for tube stage.

Last edited by plasnu; 9th August 2019 at 03:56 AM.
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Old 9th August 2019, 10:59 AM   #16
kodabmx is offline kodabmx  Canada
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Kanged switching power supply for a tube amp.
It'll work, but they tend to oscillate which you might hear through the amplifier, but I built a headphone amp with one of these. Once it gets going it usually shuts up. Don't use a choke input with it.
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Old 9th August 2019, 12:31 PM   #17
plasnu is offline plasnu  United States
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Quote:
Originally Posted by kodabmx View Post
It'll work, but they tend to oscillate which you might hear through the amplifier, but I built a headphone amp with one of these. Once it gets going it usually shuts up. Don't use a choke input with it.
Okay, I will try this with CLCLC.
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Old 9th August 2019, 02:14 PM   #18
kodabmx is offline kodabmx  Canada
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Kanged switching power supply for a tube amp.
I wouldn't even use a choke at all... If you do, realize this switches at 40kHz or so, and you'll need a choke like 10mH instead of 10H like for 60Hz... I just use an RC filter... Say 620R/47u or so if I remember correctly.
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Old 9th August 2019, 03:59 PM   #19
plasnu is offline plasnu  United States
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Quote:
Originally Posted by kodabmx View Post
I wouldn't even use a choke at all... If you do, realize this switches at 40kHz or so, and you'll need a choke like 10mH instead of 10H like for 60Hz... I just use an RC filter... Say 620R/47u or so if I remember correctly.
Thank you. I'll check the 40KHz noise filter performance with LTSPICE.

One question. Output of this converter is PWM wave, or already smoothed out with some ripple?

Last edited by plasnu; 9th August 2019 at 04:06 PM.
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Old 9th August 2019, 04:10 PM   #20
kodabmx is offline kodabmx  Canada
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Kanged switching power supply for a tube amp.
I have no idea actually... Maybe you could ask the vendor or someone with more power supply knowledge here can weigh in?

I do know that the frequency of the oscillation (whine) i hear changes with load and voltage it's set to... I try and drop 30V-40V in the first RC filter which seems to help it stabilse.
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