[Scott Dorsey]

ramtazz wrote:
I love the Maxi-Heavy Duty Heat Sink at the other end....

9K.... it better sound great... and do alot more lol

The whole idea was discussed extensively here when the things were new.
Basically there is a Peltier unit that cools the envelope of a 6AU6 tube
which keeps the thermal noise down. With a new tube, the noise floor is
lower than that of the standard 800 model.

The problem is that the tubes have a relatively short lifespan before
they develop some weird noise mechanism.... running them at normal
operating temperature for a while quiets them down again. And folks
didn't discover this for some time after they became popular.

And yeah, the heatsink for the peltier unit does affect the off-axis
response due to shading, but it's a C-37 capsule inside there to begin
with so it's already kind of weird off-axis.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."