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In Reply to: RE: Calling BS on tube audio charlatans posted by PeterI on August 07, 2014 at 09:19:00
"This is common as people do not follow our instructions, for best performance we prefer selected and specially matched to our specification, we always recommend our customers to do this..."
This may be of value. Many amps have a fairly narrow range of bias adjustment and the tubes used in those amps need to be in the range where the bias can be adjusted. As well (again, depending on the bias is implemented) a well matched set ensures no tubes in the set become current hogs and wear out more quickly than they should.
"We also recommend with our valves to replace them every 4000 hours irrespective on whether the amp is turned on or off, as the outside air damaged the valve, and finger acid eats into the glass."
Hee!! Utter bullsh*t!! If that was the case how is it that tubes made over 6 months ago still work well - after all, 6 months means over 4000 hours of exposure to the air!
And this crap (that is also peddled by a number of otherwise decent manufacturers - the "white gloves to handle the tubes with" garbage) about skin oils/"acids" eating into the glass is pure nonsense. If you are talking about halogen bulbs then skin oils can cause problems (not by eating into the glass though!), but not tubes. If acid eats into glass how come the glass jars you have food stored in don't dissolve? That quart of vinegar at the back of the cabinet should be leaking out all over the place if this was true...
Amazing...
Follow Ups:
I know Quartz Halogen lamps are not supposed to be touched be fingers when installed. These run at pretty high temperatures though.
Yes - MUCH higher than a tube envelope. And the problem is the finger residue on the halogen bulbs causes heat to be concentrated at those points, it doesn't eat through the glass!
Handling your tubes with white gloves ?
I use a clean white sock.
I just lick my fingers 8^)...............
"We also recommend with our valves to replace them every 4000 hours irrespective on whether the amp is turned on or off, as the outside air damaged the valve, and finger acid eats into the glass."
Sure glad I got rid of my NOS tubes from the 1940's through 1960's in the nick of time as they are obviously damaged and useless. Some of them were well over 600,000 hours old!
and I am VERY glad I acquired a tester that allows me to get much more accurate gm readings and current draw.
I included the whole paragraph as evidence of the (liar's) position as a service tech.
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