• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Negative Voltage using tube rectifier?

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#2
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.
 
#3
ohynot said:
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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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 !

316a
 
#4
>>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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