"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.

Has anyone tried them ?

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

Is there really any sound or performance improvement from them ?

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

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! ;-)