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Old 15th April 2004, 05:47 PM   #1
ohynot is offline ohynot  Malaysia
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Default Negative Voltage using tube rectifier?

hi all,

How to make negative voltage using Tube rectfier?
will a diode after rectifier will do? any other method?
thanks.

ynot.
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Old 15th April 2004, 06:54 PM   #2
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You need diodes with discreet, not shared, cathodes. If you are building a negative supply using a CT power trafo winding: connect the cathodes to the ends of the trafo, ground the CT, and tie both plates together. Take the negative rail from the connected plates.
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Old 15th April 2004, 08:00 PM   #3
316a is offline 316a  England
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Default Re: Negative Voltage using tube rectifier?

Quote:
Originally posted by ohynot
hi all,

How to make negative voltage using Tube rectfier?
will a diode after rectifier will do? any other method?
thanks.

ynot.
6AL5 would be suitable for low current applications for use as a full wave . Dampers or 35Z4 / EY84 etc for higher currents half wave . If you're intending using tube diodes for bias supplies I'd recommend against it though . It's a whole lot easier and saves a heater winding to use snubbed SS diodes if you ask me !

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Old 15th April 2004, 10:17 PM   #4
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>>It's a whole lot easier and saves a heater winding to use snubbed SS diodes if you ask me !<<

Not only is it easier; in the case of a bias supply, the instant on behavior of SS diodes is BENEFICIAL. A negative voltage on the grid protects against cathode stripping.
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Old 15th April 2004, 11:38 PM   #5
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Quote:
How to make negative voltage using Tube rectfier?
The easiest way is to connect the positive output of an ordinary rectifier circuit, (using a tube rectifier) to ground and take the negative voltage from the center tap of the transformer...

BR Hans
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Old 16th April 2004, 07:08 AM   #6
ohynot is offline ohynot  Malaysia
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Default Thanks Guys

Best Regards,
Ynot
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