03-10-2009, 07:47 AM
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Join Date: Apr 2005
Location: Nova Scotia,Canada
Originally Posted by HiDef
Matching sets are a way to squeeze a few more bux from a prospective buyer.
Modern manufacturing should be able to hold tubes of similar type and vintage to a match without any further manipulation.
Running matched sets is almost a necessity in some cases in order to keep one tube from current hogging. There are times it pays off. As for modern manufacturing processes
. Have you ever seen a vacuum tube plant? The ones in China,where almost all the tubes are made today, look like a 1950's flashback.It goes deeper than just the manufacturing process anyway. It involves the raw materials supplied to the plant which may have been purchased from differant manufactures at differant times and may contain differing amounts of impurities.
Bottom line is that matched sets,where the tubes are selected to have as close electrical properties (ie. gain) as possible are required in some instances HOWEVER
in a grounded grid amplifier, which the AL-811 is, running matched sets of tubes is NOT
Knowledge is knowing that a tomato is a fruit, but Wisdom is knowing not to put it in a fruit salad.