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tube power supply with no transformer? Question
tube power supply with no transformer? Question
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Old 1st April 2018, 11:12 PM   #1
Pauld35 is offline Pauld35  New Zealand
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Default tube power supply with no transformer? Question

I am looking to get a pre-amp kit, my question is the ps input for the B+ on the pcb excepts 0- 200 / 240vac. it has rect and filtering circuit on the pcb.

Q. can i run the 220vac from my nz wall socket with no pt or will i have issues? (fused etc of course)

DIY PRT-02A 6N2 Tube preamplifier kit base on AUDIO NOTE M7 preamp R130 | eBay

Old 1st April 2018, 11:17 PM   #2
AquaTarkus is offline AquaTarkus  Canada
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Extremely unsafe.
Old 1st April 2018, 11:37 PM   #3
tikiroo is offline tikiroo  New Zealand
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Don't do it. Find a 230:230 isolation transformer or use back-to-back 230:6 transformers
Old 1st April 2018, 11:39 PM   #4
nigelwright7557 is online now nigelwright7557  United Kingdom
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Old TV's used to do this for valves for cost reasons.
From a safety point of view, very risky and your thread will probably be deleted for reasons of safety.
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Old 2nd April 2018, 12:46 AM   #5
Eli Duttman is offline Eli Duttman  United States
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Forum rules prohibit transformerless designs. As has been stated, such designs are EXTREMELY unsafe. Don't do it!
Eli D.
Old 2nd April 2018, 12:54 AM   #6
anatech is offline anatech  Canada
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tube power supply with no transformer? Question

Hi Pauld35,
All these posters are correct. What you are suggesting is incredibly unsafe. It also is probably against the law in your country.

I'm closing this thread for those reasons. Don't do this.

"Just because you can, doesn't mean you should" my Wife

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