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<blockquote data-quote="pitsirikos theodoros" data-source="post: 90681" data-attributes="member: 1839"><p>ΦΙΛΕ ΑΠΟ ΤΟ MTZ audio ΔΙΑΒΑΣΕ ΑΥΤΑ ΠΟΥ ΓΡΑΦΟ ΕΓΩ ΔΕΝ ΜΠΟΡΩ ΝΑ ΤΑ ΕΞΗΓΗΣΟ ΚΑΛΑ ΣΤΑ ΕΛΗΝΙΚΑ 6211:</p><p>This unusual tube is listed as a frequency halfer, in addition to being a class A amplifier dual triode with medium mu. Medium mu means it has lower gain than the typical 12AT7, in fact lower than even the 5965 listed below. It also has much larger, flat plates that have diamond shaped points at the corners bent inwards (in the versions I have seen) that seem to add rigidity to the plate structure. This tube also has slightly lower plate voltage and current ratings, but not enough to make a difference in hi-fi use. I have seen it used in preamp circuits, and it's lower gain and lower microphonics (thanks to the large plates) probably contribute to a mellow sound. I have an amp where this tube is used interchangeably with a 12AT7, and there is a difference in sound between the two types. These are hard to find, but you may want to try them to see how a medium-mu tube sounds in place of the standard 12AT7. Just the thing to tame down a screaming guitar amp or shrill stereo system.</p></blockquote><p></p>
[QUOTE="pitsirikos theodoros, post: 90681, member: 1839"] ΦΙΛΕ ΑΠΟ ΤΟ MTZ audio ΔΙΑΒΑΣΕ ΑΥΤΑ ΠΟΥ ΓΡΑΦΟ ΕΓΩ ΔΕΝ ΜΠΟΡΩ ΝΑ ΤΑ ΕΞΗΓΗΣΟ ΚΑΛΑ ΣΤΑ ΕΛΗΝΙΚΑ 6211: This unusual tube is listed as a frequency halfer, in addition to being a class A amplifier dual triode with medium mu. Medium mu means it has lower gain than the typical 12AT7, in fact lower than even the 5965 listed below. It also has much larger, flat plates that have diamond shaped points at the corners bent inwards (in the versions I have seen) that seem to add rigidity to the plate structure. This tube also has slightly lower plate voltage and current ratings, but not enough to make a difference in hi-fi use. I have seen it used in preamp circuits, and it's lower gain and lower microphonics (thanks to the large plates) probably contribute to a mellow sound. I have an amp where this tube is used interchangeably with a 12AT7, and there is a difference in sound between the two types. These are hard to find, but you may want to try them to see how a medium-mu tube sounds in place of the standard 12AT7. Just the thing to tame down a screaming guitar amp or shrill stereo system. [/QUOTE]
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