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High voltage power supply module
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Old 19th February 2018, 05:14 PM   #1
ripson is online now ripson  Europe
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Default High voltage power supply module

I was planning to build standard PSU with chokes and RC filters but changing the voltage is a pain. Does anyone can recommend a quality plate voltage power supply ready made or a kit for SE power amp with at least 300-320V and 60-70mA or more, preferably in Europe? Soft start, good PSRR, stabilized, low output impedance etc... I was looking on eBay but found only with low current for preamps.
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Old 19th February 2018, 08:04 PM   #2
jackinnj is offline jackinnj  United States
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High voltage power supply module
In that voltage range you might be able to score a used electrophoresis power supply. Pharmacia European manufacturer.
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Old 19th February 2018, 08:16 PM   #3
ripson is online now ripson  Europe
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Thank you for your reply, I was thinking about regulated module kit that I could use in an amplifier rather than laboratory power supply
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Old 23rd February 2018, 01:25 AM   #4
exponent is offline exponent
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When you say 300V is that AC stepdown or DC? Is this for a tube amp?
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Old 23rd February 2018, 03:04 AM   #5
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by ripson View Post
I was planning to build standard PSU with chokes and RC filters but changing the voltage is a pain. Does anyone can recommend a quality plate voltage power supply ready made or a kit for SE power amp with at least 300-320V and 60-70mA or more, preferably in Europe? Soft start, good PSRR, stabilized, low output impedance etc... I was looking on eBay but found only with low current for preamps.
i think this design may be you can use!


low noise, low z-out, the sound is good!

thank your advice!
quanghao
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File Type: jpg HV For tube 300-380v.jpg (148.7 KB, 604 views)
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Old 23rd February 2018, 03:02 PM   #6
ripson is online now ripson  Europe
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Thank you quangha, it is what I am looking for, high voltage regulator. Do you know if it exists as a ready made module I can buy somewhere?
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Old 24th February 2018, 02:49 AM   #7
trobbins is online now trobbins  Australia
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You could use a 12VDC supply that runs a switchmode inverter to get 300VDC (ebay style 150W inverter). An RC buffer filter and you have a low impedance, stabilised supply with very low ripple.
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Old 24th February 2018, 03:03 AM   #8
gabdx is offline gabdx  Canada
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What will happen if the load is reduced or the power is interrupted, or the tubes fail. Some of the power supply will over dissipate power.
A lab power supply is awesome. Some company makes suitable ones for tube amps.
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Old 24th February 2018, 03:33 AM   #9
trobbins is online now trobbins  Australia
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For the example scheme I referred to, a shorted or overload on the B+ can be managed by using a 12VDC supply that has an over-current foldback limit of some kind, and then the following switchmode controller will typically hiccup as it enters/exits UVLO - that provides a good form of fault 'annunciation' :-)
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Old 24th February 2018, 02:57 PM   #10
gabdx is offline gabdx  Canada
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I am currently assembling the nuts and bolts to a 60W dissipation power supply for stereo.

So far the amp power supply has 1x 3 poles relays for the mains power (neutral and live) and for shunting the power supply output in case of tube failure or lack of conductivity to prevent dissipation, one for caps charging 'soft' start, one to cut power supply if the bias exceeds 3x value, 1 for shutting the bias monitoring circuit.

So instead of fusing each 4 anodes, I fuse the main transformer output and the regulated supply just before regulation.

The main idea with the bias monitoring and leds signals is to ensure bias within 2mA to use a toroidal transformer for approx. 50watts, UL with cathode feedback.
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