[EMAIL PROTECTED] made an utterance to the drakelist gang ---------------------------------------------------------------------- Chuck,
Those are likely emission numbers from a tube tester. If the tubes are not perfectly matched, all sorts of nasty things happen including misalignment of the planets, contamination of all known water sources, and the atmosphere will become completely toxic. So you don't want to go there. But for those that are mavericks, you can use mismatched tubes in the transmitters, transcievers, and linears. But there is a limit as to how much mismatch can be tolerated. There are a lot of old wives' tales that are founded in part from back in the 20s and 30s where push-pull circuits were common in RF as well as audio. Mismatching was more critical with those types of circuits. But in modern applications, where the tubes are in parallel there are three issues to consider, (1) power dissipation, (2) neutralization, and (3) intermod. As long as the power dissipation on any single tube does not exceed manufacturer's specs, you won't stress any of the tubes. As to neutralization, well, it depends and with different tubes you have different interelectrode capacitance, in addition to different emission; does it matter, you don't know unless you try. As to intermod, I've done a limited number of tests with a T4XC and L4B. In each case, one brand new tube was mated with a a well used tube. No observable indications of intermod etc. were observed by my local receiver and some hams several hundred miles away. To know for sure, one would need a spectrum analyzer. To each their own. I think the topic of matching is grossly exaggerated. Yet, there are cases where the mismatch is just too great and problems will occur, I just haven't experienced them. Guess I've been lucky so it is best not to use mismatched tubes and thus destroy all life forms as we now know them. 73, Evan<BR><BR><BR>**************************************<BR>Check out AOL's list of 2007's hottest products.<BR>(http://money.aol.com/special/hot-products-2007?NCID=aoltop00030000000001)</HTML> ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
