• 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.

Physically small rectifier tube with 5V heaters

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dsavitsk said:
Can anyone suggest one? Thanks.

If you don't mind breaking "rules", you could use one of the smaller 6.3v jobs that were designed for car radios. They will tolerate a pretty wide range of heater voltages. The 6x4, for instance is rated from 5 to 8 volts, http://www.mif.pg.gda.pl/homepages/frank/sheets/137/6/6X4.pdf. Should be ok, especially if your 5v winding is rated for higher current and puts out a little more than 5v.

Sheldon
 
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