subminiature tube radios?
Hi, I'm just starting to get into antique radios and was wondering about subminiature tube radios. I quite like there look and am thinking of buying one but I'm wondering how easy it is to restore them. From what I've read they usually need an unusuall type of battery that supplies high voltage so I don't know how I can find a modern battery that will work. Also I am wondering how easy is it finding subminiature tubes and how long do they last? I guess with enough searching you can always find the right tube but finding a battery replacement looks to be the biggest obstacle since the space is so limited.
hello from germany
the german name for this is "Anodenbatterie".
I assume you mean the pencil sized tubes as used in hearing aids. The sets I have seen usually require 45 volts B supply such as a Eveready 415 battery. Allied sells these, I think about $15. They last I would guess about 30 hours intermittent use.
Das es gut, MM. Is there a way to translate the site to English?
Sorry, I have no Deutch.
A couple of thoughts from my way;
Most of those “B” batteries (Eveready 467 and others) are still readily available.
22,5V No. 412
45V No. 415
45V No. 455
67,5V No. 416
67,5V No. 467
I just bought a pair of Eveready 467 – 67.5 volt and 412 – 22.5 volt from a local supplier (Phoenix AZ) called Batteries Plus. For a 1950’s tube type Scintillation counter I like to play with.
These batteries seem to last a lot longer than they did back in the day.
They are also more expensive.
During the late 1950’s there was at least one four tube set that made a complete radio using subminiature tubes. A good example is the Tom Thumb radio made by Automatic Electric Co.
About 25 years ago someone came across a full case of those radios brand new sealed in their boxes. AEC ended up buying them and sold them to collectors. I bought one opened the box put in the batteries and it played like new (which it was).
There were other versions that had a pair of transistors for the audio final and a set of sub-min tubes in the receiver, Emerson had a couple of models.
Subminiature tubes being those little pencil size tubes which usually had a CK number or a four digit military. The radio set use numbers similar to 1U5, 1T5 which were 7 pin miniatures.
When repairing radios and TVs (fernsehern ) in the '60s I had ocassion to work on some sub-nini w/ 2 xistor audio output. They were book shaped and turned on by opening the cover. One was titled "As you like it" ( Shakespear). Dont remember the battery voltages. But 67.5 sounds good for B+ and 3V for filiment. OT.
Regarding sub-mini tubes will MM in Germany ( Deutschland ) reply bitte. Have had the pleasure of working with these tubes. Some were used in proximity inti-aircraft artillery shells in WW2. Naturally, they were designed for the military. Wir geben mir mehr muhe. Georg, OT.
in WW2 time, i dont know any sub miniatur tube in this time.
This was a time of coke bottle and steel tubes with octal feets. "sub mini" was simply shorter in height, and with steel can instead of glas (sometimes, a lot of this tubes was made in both series, as a glass, and as a steel...)
A lot of them was also used in radio manufacturing, so we find them oftenly and not only in military eqips. I think the biggest series was "4", "7" and "11".
So a typical steel- ( or also glas-) short bottle = miniatur of WW2 was the EF11, ECH11 and so on. See :
the "Luxor" Radio, and "Akkord" use our old D-Sub mniatur tubes inside, all of them with Anodenbatterie and Filament Battery
MM, Willkommen zum Antiken Radioforum. Ich hoffe, daß Sie häufig besuchen. Ich mag über Elektronik in Deutschland hören. Ich war in Neu Ulm 1970 in Wiley Kasern, US Armee Pershing Flugschlosser. Ich hoffe, Deutschland wieder zu besichtigen bald.
I hope the translation is OK, it was done by the computer!!
After seing the price of the batteries I've decided I probably wont get one as I like to use my radios very often. I currently have a transoceanic 600 which I love and making a battery pack is easy since it has so much room but there isn't much in these tiny guys. I might go for an early transistor radio for when I need something portable to take with me but the quality of the audio in allot of them looks to be lacking. The one I like the most is the Zenith royal 500 but I dont know how they sound.
if u are good in electronics, we can engineer an homebrew High voltage konverter to use one simply accu in tube radios. In PWM technology this may be very small.