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In Reply to: RE: Note to Kevin Deal - Why Don't You Protect the World from This Guy? posted by baileyler on June 14, 2015 at 16:09:26
is a bit of a pretender.If he really was the expert he says he is he would not be selling 6881/6su7 as equal to the 5691. The 5691 draws twice the heater current therefore they are not equals/direct replacements.
He also would not be selling 5687 as equal to the 7044. They are similar but the mu of the 5687 is 17 and the 7044 is 21. The plate curves are different, therefore the optimal operating points are not the same.
Just because everyone else is doing it doesn't make it right for a true expert to do it.
A true expert should be above that type of behavior.
A true expert should take the time to explain the differences not falsely claim that two tubes, that are not equal, are equal.
Edit, One more example.
"THESE 6SU7 TUBES ARE A DIRECT REPLACEMENT FOR ANY 6SL7 / 6SL7GT / 5691 / VT-299 /ECC35"
"DID YOU KNOW THESE CAN BE TURNED INTO 12AX7 TUBES WITH AN ADAPTER"
How in the hell can an adapter turn a tube with a mu of 70 into a tube with a mu of 100?
I don't expect statements like that from a true expert.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 06/15/15Follow Ups:
That's a bummer I picked up a quad of really beautiful NOS Tung Sol 6SU7s some years ago. I was told that it was just Tung Sols peculiar naming and that they were exactly equal to the 6SL7! I still don't have an application for them so I thought I would sell them at some point. Do some people use them as 6SL7s?
Steve
They are 6SL7s. Just really nice ones. Tre was talking about 5691s and 6SL7s not being the same.
They are really nice and I'll take half of whatever Mechans gives you. :-)
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
The 6su7 is a 6sl7 with higher vacuum and low noise and matched triodes.
I have 3 tung sols, rebranded, that I bought off ebay when no one else recognized what they were.
The seller was calling them 6sl7s.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Hi Tre, it seems that there are a quite a few incidents where mil-spec tubes were relabeled to the civilian designation. Many years back on the bay, a seller was liquidating 6V6 tubes that were actually 5992s. I scooped up a bunch of them and they were not that cheap but they are worth a whole lot more now. They came in nice original Bendix boxes stamped 6v6gt on the end flaps. I surmise that in the tail end of the tube manufacturing business when the production had shutdown and the wharehouses were selling off their remaining stock. Relabeling milspec tubes as civilian types was not unusual. cheers, Dak
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