Radiola III 1924 Two WD-11

[RCA630TS]

Thank you for posting that, very informative!

[AllAmericanFiveRadio]

Thanks RCA630TS

[YosemiteGuy]

outstanding !!! kudos to You, Sir ;)

[AllAmericanFiveRadio]

Thanks, it is fun to operate.

[gmcjetpilot]

Rick I have a Zenith G730 AM/FM 7 tube. It was DOA. The problem was obvious one of two tuning slugs (FM Oscillator 98 M.C.) was broke in half and floating around the cabinet. The 2" long ferrite slug, rod 3/16" dia moves up and down via a cam on the tuning (air) Cap in a coil. FM was zero and only received one strong AM station.

To my surprised gluing the slug together fixed the FM and AM! Can you explain SLUG tuning or direct me to a Ref? May be an AllAmericanFiveRadio VIDEO on SLUG TUNING?

[AllAmericanFiveRadio]

Sounds like the common side may have been open, maybe. I did do a video on a radio that used slug tuning but I don't remember how mush I explained the tuning. The vid is Emerson Black Catlin Radio. But basically the slug tuning changes the coil and the capacitor remains the same. They use this method in car radios to safe space.

[gmcjetpilot]

Right I think that's what happened. It was like I "put the smoke back into the radio", since all electronics run on smoke (ha ha). I was just amazed at such a simple repair had such a drastic (positive) result. I thought of them as trim and secondary to total alignment. Oh no. That slug broke in half disabled the radio. Thankfully the slug broke clean with no bits crumbling and it went together straight and gap free with some epoxy. I was worried about conductivity but that is irrelevant. Thanks

[batterymaker]

Those don't look like WD-11's to me... :-)

I have my grandfather's Radiola III and someday I intend to restore it.

[AllAmericanFiveRadio]

Several years ago Antique Electronic Supply was selling rebased WD-11s. I don't remember what tube they used to put on a WD-11 base but it was a good match. I wish I would have bought many more because they are no longer available and the WD-11 is now on sale for $185 each. I hope when you restore your grandfather's radio you do a video on it.

[togst]

Neat radio you got there! Funny name on that box on the side of the radio,"Universal variable impedance matching doohickey", gave me a little laugh. Basically what that box does is to turn down the high impedance from the old radio to something your camera can handle?

Anyway, thanks for yet another fantastic and enjoyable video!

-Frank

[AllAmericanFiveRadio]

Thanks Frank. It is an interesting radio. The Radiola's by RCA are some of the very first commercial vacuum tube radios, lots of radio history. My publisher has published a great book on the RCA Radiola radios and there history, you would enjoy it. The UVIMD does work well. In this case it take high impedance at 45 volts to a microphone input.