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#1
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McIntosh MC65 - Update II
Just for giggles, I tested the tubes on this beast, something I usually
do not do unless I have other reasons to do so. Well.... Just goes to show you how much resilience these things have. Of the 14 tubes, only the rectifier and the 6C4 tested at-or-above minimums (per my Hickok 539B). Several of the dual-section tubes had one-or-the-other sections barely lifting the pin. The rest of them were no better than 40% of minimum. All measurements verified against NOS tubes in-hand which _DID_ test correctly. And it "worked". Now, of course, it works much better, the stereo separation is much sharper, the muting action much crisper, and the AFC actually appears to do something. So, recapping got my MPX back. New tubes and it is, for lack of a better word, a Neat little tuner. I also have to admit that this is the very first time I have come across such worn tubes in any tuner of the many that have passed through my hands. This thing must have been run hard and put away wet for years before I tripped over it. Peter Wieck Wyncote, PA |
#2
Posted to rec.audio.tubes
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McIntosh MC65 - Update II
Peter Wieck wrote: Just for giggles, I tested the tubes on this beast, something I usually do not do unless I have other reasons to do so. Well.... Just goes to show you how much resilience these things have. Of the 14 tubes, only the rectifier and the 6C4 tested at-or-above minimums (per my Hickok 539B). Several of the dual-section tubes had one-or-the-other sections barely lifting the pin. The rest of them were no better than 40% of minimum. All measurements verified against NOS tubes in-hand which _DID_ test correctly. And it "worked". Now, of course, it works much better, the stereo separation is much sharper, the muting action much crisper, and the AFC actually appears to do something. So, recapping got my MPX back. New tubes and it is, for lack of a better word, a Neat little tuner. I also have to admit that this is the very first time I have come across such worn tubes in any tuner of the many that have passed through my hands. This thing must have been run hard and put away wet for years before I tripped over it. Peter Wieck Wyncote, PA Remarkably, tube circuts will work if gm is only a small fraction of the gm mentioned in the tube data. Except they don't work quite as well as they should...... Tubed tuners can offer superlative performance.... Patrick Turner. |
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