Results 1 – 36 of 36 Free Shipping on many items across the worlds largest range of C3g Tube. Find the perfect Christmas gift ideas with eBay. Buy C3G vacuum tubes online, in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. Built specifically for the German post, these are special quality – 10, hour pentodes for use in AF and RF circuits. This really is the ULTIMATE preamp tube.

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The “3” I believe is to show they are third generation post tubes. These were low noise audio tubes, made by Valvo, Siemens and Telefunken, exclusively for the German post. As they all are. The TFK have a nice logo stamped into the metal. Most have a banderols on it, with a series number, but not all of them have this.

These were not for sale for other customers. They were used in repeater amplifiers for long distance telephony. I have an original price list not a copy. Here you can see C3g has cost DM for one. That is Euro. The factory price for the standard 50pcs box was Euro.

Admitted, in the steel can they are not glowing so nice. Believe me, once you feel these tubes get warm, you start to see them as tubes also.

C 3g, Tube C3g; Röhre C 3g ID, Vacuum Pentode

Who can remember the ‘s with a long distance call from Europe to the USA? So you started to speak very loud into the phone, but that didn’t help much, and I remember people in the offices would try to look important, by shouting into the phone with long distance calls. Anyway this is not what good signal transmission is about, but it was the limits of what was possible with ocean cables. Tybe problem is, a long distance telephone cable is a noise generator, and an attenuator too.

So after a certain length, the noise gets more and signal gets less.

This limits the length of a telephone line, and simply amplifying the low signal that comes out, would not help since you can’t get rid of the noise. If this is unclear to you, imagine the following, on a loud market place in the open, somebody shouts a message to you from a distance. You can understand it, c33g the noise. You could repeat the message, and shout it to the next person. So you are a “repeater”, and with enough repeaters, you can send a message over great distance, regardless the high noise level.

Provided no repeater distorts tub message of course. Now suppose you don’t want to use repeaters, this is not going to work. The sending person can not shout any louder as maximum, and suppose you go all at the other end of the market place, it will not help to amplify what you receive with amplifying equipment. You would amplify all the random speaking and noises too, cg3 what you try to hear gets lost in the tubf babble and shouting on that market place.

Indeed the only solution is, to repeat the message before it gets lost in the noise. You see, with a long distance transmission cable, it works the same way.


So the only solution is, to re-amplify the signal before it gets too noisy. It increases the maximum length of a cable c3f by putting in repeaters, by amplifying the signal before the signal-to-noise-ratio SNR gets really bad. Doing so on our planet, using good cables and finest tube equipment, they could overcome distances from one continent to the other. Though practical situations are extremely difficult, and such projects are higher arts of project management.

Imagine the weight of such a cable on a ship, or the trouble with repeaters in salt water, with a meters column of water pressure on it, inaccessible for ever, somewhere between Honolulu and Paris, on the ocean bottom.

Going further back to the ‘s, this had to be done with tube equipment. Of course they tried to use as little repeaters as possible. The ideal repeater amplifier adds no noise, has no distortion, draws no current, is very small, and needs no service. A partial solution you get from adding an c3y transformer Pupin coils at certain distances, but there comes a moment where you need active amplification.

So the engineers desired the “ideal” tube. However these ideal requirements do not go together well: High Amplification, low noise, long life, no distortion, small size, low filament power. As most of you know, a tube with more heater temperature will have better electrical tubd, and more lifetime, but uses more power too. So the solution is a bit more complicated than you might think. The price of C3g was DM for one tube.

So a standard Pack of those had the price of two new cars. Obviously, cost was no issue with those, and that’s logical since with those you could for instance work with a cable that had a bit higher loss, and add repeaters inside to compensate that.

C3g – Bartola® Valves

This is the world of C3g, C3m, C3o. I think most of the secrets of how to make C3-tubes are gone with the wind, but at least we can still buy those miracles of tube art from new old stock. If the days come where we only can buy used one, it’s no problem too, since the end-of-life is clearly specified in the data sheets. So you can always tell if the tubes are still good.

I found the Funke W19 tester very reliable in picking out used tubes with good lifetime in it. Individual series number on each tube Let me bring to c3f attention, the C3g at it’s introduction in was the fist Frame grid tube, and it was not available commercially.

In short, a frame grid means the grid wire is not self supporting, but is wound around a hard metal frame. Like this, they could use wire which is so exceptionally thin, as it was never possible before. You can not see this wire with the bare eye. This is quite strange to observe, when you take a frame grid tube apart. The grid wire is there of course, and you can “see” there is something there, that you can look through, but tubf can not see what that is.

As if there is a gold colored, transparent layer, that you can see through. Things looks a bit “unsharp” when you look though. Like the cg3 resolution picture below. It is just like this when you look at a frame grid wit the bare eye. Then, if you click the picture it gets enlarged, and you can see the wires. This technology is more expensive, and was used for very few tube types, perhaps only. Given the 10’s of thousands other tube types ever made, this is not much.


Read here about frame grid tubes. NOTE that in the ‘s when tubes were obsoleted, there was a lifetime-buy option by Siemens for the German post. It stretched over a few years.

It is from this period that BIG lots of tubes were made, and just stored for later service of old hardware. Because of the high manufacturing numbers, these were very good quality. Probably many other tubes as well, it’s just these three Types I ran across myself. Something similar happened in the USA, and from that period many very good, 12AT7 and are around. These are those tubes with a barcode label on them. Then, the whole hardware developed so quickly after the digital multiplexing was used, and analog repeaters were taken out of service everywhere sooner than expected.

And so, a six digit number of those tubes were stored and never used. Through the years these c3 sold, and it seems the German government stocks of C3g and C3m have dried up since or so. However, these tubes are always somewhere, and find the path to their end user.

Check for a v3g pages!! Just look at how nice the triode connected curves are. What to do, if you don’t like the metal cap?

Little Dot Tube Amps: Vacuum Tube Rolling Guide

You can take off the metal housing, and inside is a very nice glass tube! C3m inside C3g with cap. Look at the two round plates above the pins. The lowest is a metal shield outside connected for lower hum.

The other is the mica. The anodes are open from the sides. This open construction is the best for finest linearity.

It allowed plate distance adjustments after the tube was assembled. This noncommercial construction was used already in DHT post tubes from the ‘s. We are lucky to have a lot of the C3g version with the additional zirconium getter. All C3m we sell gave this double getter!

So that is additional to the Barium getter ring or plate. A Zirconium getter is expensive and it works like this: A Barium getter has most of its function during the short moment a few seconds that it is flashed tueb production, so when it is in the tube in the form of a cloud, while being transferred d3g of the getter halo, and condensing on the tube glass.

This cloud, at the moment it exists inside the tube, absorbs at that short moment almost anything whatsoever. Then, after it will be condensed on the glass, the Barium getter is only conditional active.

Like during great heat such as with KT88 tubes.

Siemens C3g Vintage Tube & Tube Socket

However little tubes like C3g can not really use the getter any more after activation. Of course there are some remaining functions left, amongst which is dust catching yes! Here is where the Zirconium getter comes in.