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In Reply to: RE: I wish I could agree with that posted by Jim McShane on February 27, 2017 at 11:20:54
...who regularly curses at the boxes of rejected tubes. I will spare the horror stories, but they are indeed stories of horror.
It is possible that you are not concerned with the parameters that are important to us. The tubes we reject may, indeed, work in some other circuits.
But the bottom line remains - the NOS tubes are vastly superior.
It also appears that the quality has gone through its lowest point, when we rejected up to 40% of tubes. Today it is "only" about 20%.
Follow Ups:
It needs to be said that I am concerned with the parameters that allow the tube to perform properly in any given customer's gear. I do not test the tube's ability to meet unique characteristics imposed by use in your products. To me that is two far different sets of test parameters.
It also needs to be said - so no one misinteprets your statement "It is possible that you are not concerned with the parameters that are important to us" - that I do not believe you were inferring that I don't do a thorough and complete job of testing the tubes. If you were I will just say you would have been badly mistaken, because I DO perform a thorough and complete test regimen on each tube before it is available for sale.
So are the -DR tubes "vastly superior"? In your gear it would seem so since I'm sure no one knows that better than you do! But for the entire population of 6H30 sockets out there your statement does not match my experience.
If you'd like to have the last word please feel free, but I'm going to bow out at this point. Again, thanks for posting and sharing your point of view!
Two of them are universal - noise and microphonics. The third one is also the standard tube parameter, that some circuits might not be sensitive too, but it is not our invention - it is there, on their spec sheet.
Like I said, we do reject high number of current production tubes. With the NOS's there is no such thing - you just plug them in and you can ship the product. We went through many thousands of them with virtually no rejections.
I truly have no skin in this game, as the NOS tubes are pretty much all gone now, but it is not correct to say the two populations are equal.
The discussion is almost academic at this point, but my recommendation is - if you see some NOS's pop up - get them.
Victor
Unfortunately,I never noticed these tubes back when they were reasonably price if they in fact even were. What do you do for tubes in your preamps because I have a Supratek Grange here that uses a pair and I priced the milspec ones and they are upwards of 400usd each.If the milspec 6H30Pi has the reliability you say with low microphonics in all but a few,I wonder if New Sensor can duplicate the milspec ones at a higher cost to keep everyone happy?
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
I have seen them go for $160 on ebay. You have to look, but they do still pop up in small lots here and there.
How much were they on Ebay when the Russian sellers first started selling them?To look at them,they strongly resemble the 6H6p.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
I am not sure what you are asking. The 6H6P is a VERY different tube.
IIRC, back when it all started, you could get the real NOS 6H30's for well under $100.
Mikey IIRC the Rp of the 6n6p is more, ~ 2K, but a mighty fine tube. I built a parafeed linestage around the 6n6p, using Magnequest B7 nickle core transformers. It sounded great, very linear tube, cheap and plentiful.They are like an ECC99 with a slightly different pin out, only better. Pin 9 is a shield between the 2 triode sections, instead of heater center tap, so only a 6.3v tube.
The mid 60's vintage Reflector/Saratov (also called Foton) tubes with the diamond shaped logo, and the square getter, are the bomb. Those tubes are hard to find now, and command a higher price, but well worth it.
beeg nose
Edits: 03/04/17 03/04/17 03/04/17
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