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#1
Posted to rec.audio.tubes
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Looking for a matched pair of 12At7s or a matched pair of a substitute tube..
using a little Jolida 102b while my Mastersound is down, want a matched
pair of 12AT7s or any suitable substitute pair.. same manufacturer and type, please..... will pay , of course |
#2
Posted to rec.audio.tubes
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Looking for a matched pair of 12At7s or a matched pair of asubstitute tube..
On Jan 9, 1:40*am, Cipher wrote:
using a little Jolida 102b *while my Mastersound is down, *want a matched pair of 12AT7s or any suitable substitute pair.. same manufacturer and type, please..... will pay , of course With respect, the 12AT7 is a high-mu twin-triode. "matching" if it is to be meaningful requires that the plate current for all sections of both tubes be within 5%, between sections and from tube-to-tube. In a *SMALL SIGNAL* tube. This will be disproportionately difficult (therefore expensive) to achieve in any meaningful way. Further to this, unless your source has both the correct equipment to determine such matches *AND* is fantastically honest, you have no way of being sure that the results are real in what you receive - unless you can verify it yourself - back to the equipment. Nor will your equipment require such matching. Nor will such matching last more than the first few dozen hours of use, if that. Just look for two good-testing, screened-for-noise-and-microphonics 12AT7s and save your money for something meaningful. Peter Wieck Melrose Park, PA |
#3
Posted to rec.audio.tubes
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Looking for a matched pair of 12At7s or a matched pair of a substitute tube..
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#4
Posted to rec.audio.tubes
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Looking for a matched pair of 12At7s or a matched pair of a substitute tube..
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#5
Posted to rec.audio.tubes
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Looking for a matched pair of 12At7s or a matched pair of asubstitute tube..
On Jan 9, 11:38 pm, Cipher wrote:
Peter Wieck wrote in news:0e08a724-b422-4ee4-acce- : On Jan 9, 1:40 am, Cipher wrote: using a little Jolida 102b while my Mastersound is down, want a mat ched pair of 12AT7s or any suitable substitute pair.. same manufacturer and type, please..... will pay , of course With respect, the 12AT7 is a high-mu twin-triode. "matching" if it is to be meaningful requires that the plate current for all sections of both tubes be within 5%, between sections and from tube-to-tube. In a *SMALL SIGNAL* tube. This will be disproportionately difficult (therefore expensive) to achieve in any meaningful way. Further to this, unless your source has both the correct equipment to determine such matches *AND* is fantastically honest, you have no way of being sure that the results are real in what you receive - unless you can verify it yourself - back to the equipment. True. Dual section high mu triodes are inherently unmatched and it doesn't matter anyway. Nor will your equipment require such matching. Nor will such matching last more than the first few dozen hours of use, if that. Just look for two good-testing, screened-for-noise-and-microphonics 12AT7s and save your money for something meaningful. Peter Wieck Melrose Park, PA ok, Sir. I am requesting that for reasons such as resale value. The average audio fanatic-type assumes that matched tubes are superior(by matching I mean same manufacturer, not values, but two of the same type ( ie SED "winged C" )and manufacturer). So we should cater to idiots???? No. I know, to learned types it is silly, but audiophools(myself included) are a peculiar lot. How would they know the difference? They wouldn't. |
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