They are extremely microphonic – reminding me of an old 71A globe linestage I built many moons ago. There no other way, not for these tubes here, and not for any other tube. Read here about frame grid tubes. They have top-notch amplification components and low-noise processing capabilities that emit accurate sounds. Cary Audio SLI integrated amplifier. This item doesn’t belong on this page.

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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 c3k.

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C 3m, Tube C3m; Röhre C 3m ID, Vacuum Pentode

It stretched over a few years. Incidentally, we saw nothing that looked like transformer saturation: A Zirconium getter is expensive and it works like this: However C3m will give that low distortion at a gain of So, the 13mA tube is considered to be “good” above 8mA.

Leave this field blank. Absent any technical information about those transformers, I don’t know what connection possibilities they offer the designer. However C3o is exceptionally rare as NOS tube. This is quite strange to observe, when you take a frame grid tube apart. So far, I was not able to find the factory specifications for this, but one day, I hope “coincidence” is going to help us out here.

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Siemens C3m Vintage Tube & Tube Socket

So I can say I have them from the first owner. The unit had lots of knobs and instruments on it. Then, if you click the picture it gets enlarged, and you can see the wires. As I mentioned earlier, Ken Shindo tends to more or less perpetually rethink his product designs.

However little tubes like C3g can not really use the getter any more after activation. The anodes are open from the sides. He did a lot of testing with various driver tubes, found the provided enough swing to drive the B to full power. If there was no change, you didn’t hit the tube hard enough. Don’t feel the penrode us quite up to it. I purchased those tubes from a retired Telefunken employee, who traced down big lots of C3g and C3m to where they were originally sold to, and actually found some.

NOTE that in lentode ‘s when tubes were obsoleted, there was a lifetime-buy option by Siemens for the German post. Along the top portion of the housing, a black, rubber material covers the base.

Whatever you use has to do it fast enough to sound good. When making my linestage, I once fired it up for minutes to take some voltage readings.

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Maintenance of the vacuum is done by the Zirconium getter. Who can remember the ‘s with a long distance call from Europe to the USA?

Driver tubes for 300b amps

Bass notes are never weak throughout mellow performances because every Siemens C3M tube is designed with commercial-grade metal shielding. They are both good, so pentose have to listen to decide what’s your preference, but for that kind of money I’d want to be sure. However these ideal requirements do not go together well: In pentode mode, C3m has distortion figures compared with E80CC, but at much higher gain.

The tube tester W20 Card from above You may also like. That could break the glass pipe in the middle. Such a tube has a tolerance problem, it is simply not build well, or it was dropped, and the inner structure is deformed. Auto bias is intended for tubes that have good parameters by design anyway, but we want to know if the tube is at the end of life, or perhaps like new.