1953 Zenith Model K401 Personal Portable Radio

[retrochad]

very nice radio! They really have those tubes tucked in there pretty tightly.

[breehound]

Great vid, beautiful Zenith. Keep them coming.:-)

[umajunkcollector]

what was the switch for?

[batterymaker]

Tone control--though it doesn't give much of a difference, given the speaker's size.

[CoolDudeClem]

That starts up quickly for a tube unit. Can tubes warm up that fast, or was it already warmed up but just turned off briefly before starting the camera?

[batterymaker]

Battery tubes start almost instantaneously. The delay you're referring to is common with tube rectifiers and mains radios.