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Noise: cheap power inverter for series heater string
Noise: cheap power inverter for series heater string
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Old 16th May 2018, 10:59 AM   #11
Tubelab_com is offline Tubelab_com  United States
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Location: West Virginia panhandle
Stick the words "boost converter" into Amazon's search engine and see what turns up. There are plenty of "DC to DC 3.0-30 V to 5-35 V Output Voltage Adjustable Step-up Circuit Board" to choose from. Realize that the capabilities are probably exaggerated a bit, but many of these do work, and cost less than the individual parts would cost us to make one. The output is ground referenced which is OK, and these are probably cleaner than trying to use series wired tubes on 120 volts.

There are also several versions capable of making B+ voltage some are regulated and some are not. I have experimented with some of them, but not seriously enough to make a complete amp.

These things seem to come and go, and none of the simple unregulated versions that I bought almost 2 years ago are still listed. Neither are the Philips 240 volt inverters that I cannibalized for my 12 volt to 280 volt power supply which still works.
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Old 16th May 2018, 03:47 PM   #12
kodabmx is offline kodabmx  Canada
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In my experience, unless the inverter is square wave, it'll work fine. I had a UPS that used stepped sine (looks like a wedding cake) that I had an old tube amp plugged into. With pure sine from the outlet, there was audible 120Hz hum from the outputs, but when powered from the stepped sine inverter, it was silent. Apparently it's easier to filter for the built in RC filter.
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