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Battery-Powered Tube Radio Conversion

...does have it's own speaker which is tied directly to the OT. The speaker cone is transparent; pretty cool! Also has a DM70 "exclamation point" magic eye tube! Would like to maybe reverse it's operation with an OpAmp so it lights up as you crank it... muhahaa. I did a bit of reading on running those...

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Battery-Powered Tube Radio Conversion

As promised, I put together a circuit that can drive your DM70 indicator tube so that its display will become longer and brighter in response to audio, similar to a VU meter. Unfortunately for this type of indicator tube the display’s indicator line begins at the top of its track and grows downward. Perhaps...

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Battery-Powered Tube Radio Conversion

...with different supply and grid control voltages. The only ones with 1.4v filaments, that I am aware of, are your DM70 and its sibling DM71.Most others use 6.3 or 12.6 volts filament and sometimes higher anode volts. For instance those round "magic eye" tubes come in a bunch of flavors. Two very common ones...

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