Tube question - who makes Magnum Dynalab Reference 6922 Cryovalves??

lewm:

The tubes (both old/new production) were later cryo'd by outsourced providers.

Have not purchased tubes for years, as I purchased gobs of them 20 years ago, but cryo was an option/upcharge back 15 years (or so).

ATSI (a tube dealer) comes to mind as I purchased Reflektor (sp?) Russian 6922 types from them @ the time.

DeKay

thanks for the help!

"The tubes (both old/new production) were later cryo'd by outsourced providers."

That's exactly what I said too, or was trying to say.

I believe the owner of MD told me they source their cryo-tubes from Telefunken (the new ones).  They also have some information on their website about it.  And the guy that makes Pearl Tube Coolers offers a deep freeze cryo treatment in liquid nitrogen, not just nitrogen gas. 

There is some great information on the Pearl Website about it.

Jeff