"Arny Krueger" wrote in message
...
"Arfa Daily" wrote in message

OK, so when I asked about the bias setting on the
Lumleys, Keith suggested that the owner should be running
Svets in there, as did several others, so I went looking
for some sources and prices. Watford Valves have some "
Cryo - Treated " Svet 6550C's for a couple of quid more
than the 'standard' types. See

http://www.watfordvalves.com/products.asp?id=10

What was it that P.T. Barnum said?

This is a new one on me.


Cryogenic treatment of just about anything, followed by pseudoscientific
claims for improved performance is decades old.


No, honestly Arny. I've been around in the electronic service business for
35 years, and cut my teeth on valves as an apprentice. I still service a lot
of valve gear now. In all of those years, I have never heard of anyone doing
this to a valve, and claiming that it alters the characteristics in any way.
Having now looked, there does seem to be a lot of people on the web
providing the service, and making all sorts of claims about it, but from a
service engineers point of view, I've never before heard of it, or seen any
articles in the trade press about it.

Has anyone tried them ?

Admitting this is IMO like admitting to being a born sucker.

I'm inclined to agree, but I was just interested to see if anyone actually
did come back on this one with any claims - at the risk of starting another
" I can hear the difference between bell wire and electricity board cable "
debate. It just might have been that someone had some proper measurements
that they'd done, but it would be hard to carry out such measurements, as
you would have to do them on a before and after basis on the same valve.

Is there really any sound or performance improvement from them ?

One that is readily demonstrable in a sighted evaluation, of course.

Again, I was just looking for an opinion from anyone that might have been
tempted to have tried them. I certainly wasn't about to recommend them to my
customer, no matter what anyone said, but if there had have been anyone come
back and say anything positive about them, then I might myself have been
tempted to get a couple ( no matter how much of a mug you or anyone else
might think that that makes me ), purely from a research interest point of
view.

Or have they maybe been cooled in a big vat of the snake
oil that everyone on here is so fond of talking about ?

Very good, grasshopper. You have learned well! ;-)


Glad I've pleased you ...

Arfa