/diy/ - Do It Yourself

>>83577
Well, tubes needs vary for filament and B+ voltages.

They can require anywhere from 100VDC to 5000VDC, or more for the B+. The perk is that the B+ is low current, so only a few hundred milliamps.

Filament power is typically low voltage, high current. 6.3v or 12v are most popular. Filament can be VAC, although you may induce a hum (not too hard to remove). Typical filament current is anywhere from 1 amp to 20 amps depending on the tube.

So here's the downside of the B+.

Depending on the amount of current you need to pass, for an average transmission tube with a 1500vdc B+, you'll need several THOUSAND windings to up 110VAC to the required 1500VAC, which then has to be rectified.

Keep in mind, you must also calculate in the voltage sag of your circuit. Excess voltage will shorten component life.

>high voltage transformers for an AM, high level modulation transmitter.