Thanks Hawk! I may grab one of those. Have you tried them and what changes in sound might I expect using one?
I also see where there are some Tung Sol 6336's available on Ebay but they draw 5 amps. Anyone had experience with them or bad idea?
I need to locate the Bottlehead list of tubes again so I can more carefully check out what to try.
Hi, Tom, I used that adapter. But the top 6SN7s are very expensive comparing to 12au7s.
Here is a good reference:
http://www.fourwater.com/files/hist6sn7.txt
"
Another debate about plates is the plate material color.
The material color does not have any real impact on the performance
of the tube. While some argue that the black plates are better because
they can radiate heat more effectively, the reality is that the
tubes are not operated at a level where this would have any impact
on the performance of the tube. A better reason for paying attention
to the plate material used is to get an idea of who made the tube.
Black rectangular ribbed plates are most commonly found on RCA tubes
(although they produced rectangular gray and square gray plates as well).
Square plates are found in later (cheaper) constructed tubes, which
is why they usually don't command as high a price as the rectangular
or round plates. The round plates don't have as much maximum power
handling as the rectangular or square plates, but
the round plates
have a more even distribution between the cathode, grid and plate which
improves the amplification quality of the tube." (leads to >$150 TS RP tubes,
)
The PT-3 power transformer can handle 3.5 amps of AC heating.
Not sure about the new PT-10 in your crack.
