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Grounded power supply cord on a transformerless amp ?
Grounded power supply cord on a transformerless amp ?
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Old 7th June 2009, 08:24 PM   #1
bereanbill is offline bereanbill  United States
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Question Grounded power supply cord on a transformerless amp ?

Hi again? Is it possible to put a grounded power supply cord on a transformerless amp ( 50C5, 35W4, 12AU6 ) provided it has an isolation transformer ?
BTW: What is the correct name for such an amp? I have heard "transformerless", "Line voltage", "voltage dividing"...??
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Old 7th June 2009, 08:38 PM   #2
Miles Prower is offline Miles Prower  United States
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Default Re: Grounded power supply cord on a transformerless amp ?

Quote:
Originally posted by bereanbill
Hi again? Is it possible to put a grounded power supply cord on a transformerless amp ( 50C5, 35W4, 12AU6 ) provided it has an isolation transformer ?
It is, and an isolation xfmr is mandatory for such a circuit.

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BTW: What is the correct name for such an amp? I have heard "transformerless", "Line voltage", "voltage dividing"...??
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Old 7th June 2009, 09:09 PM   #3
bereanbill is offline bereanbill  United States
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Default Re: Re: Grounded power supply cord on a transformerless amp ?

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Originally posted by Miles Prower


It is, and an isolation xfmr is mandatory for such a circuit.



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Yeah...especially for harmonica players ! Scares the willies out of me when I see them advertsed on Feebay as harp amps. Gives a whole new meaning to the term "Hot Lips". With the isolation tranny and a grounded cord, are they reasonably safe? Some...especially this little Lindell I have...can put out a cool low-fi grind that is a useful recording tone.
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Old 7th June 2009, 11:38 PM   #4
DigitalJunkie is offline DigitalJunkie  United States
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With a properly wired isolation trans,and a chassis earth-ground connection,it is safe.
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Old 8th June 2009, 12:04 AM   #5
Eli Duttman is online now Eli Duttman  United States
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Suitable isolation trafos are available at very reasonable cost. Check out Triad's N-68X and N-77U. Allied Electronics has 'em.
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Old 8th June 2009, 12:11 AM   #6
bereanbill is offline bereanbill  United States
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Thanks Miles, DJ, and Eli. This amp has an OEM IT...must have been made after UL required them? So do i wire it as the 2 conductor and just ground it to the chassis ?
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