Jim Lesurf wrote:
In article , Chris Morriss
wrote:



The low internal impedance in a triode is because of the internal
feedback between the anode and the grid. Although the feedback
mechanism is obvious at high frequencies (Miller effect) the varying
voltage on the anode couples to the grid as an NFB mechanism even at LF.


Thinking of directly heated triodes, I see the pair of DA100s that I'm
selling on Ebay are up to 186 pounds.


Hmmm. Perhaps I should have sold the PX4's and PX25's I had on ebay!
:-)

Slainte,

Jim

Maybe.

http://cgi.ebay.com/ws/eBayISAPI.dll...tegory=14 973

--
Nick