Philefreak, KT88 and 6550s are tetrodes. The KT stands for kinkless tetrode. The screen and suppressor grids are tied, hence being a tetrode. An EL34 is a true pentode.
Running a 6550 in triode mode simply means that the suppressor grid is biased to the anode, normally via a resistor. It does not compromise the working of the working of the tube or the sound in any way. The suppressor and screen grid do not get in the way of the functioning of the tube when run in triode mode. Most audio critics/audiophiles prefer pentode and tetrode tubes wired as triodes.
The CAT JL2 uses a pentode tube (6550) in triode mode. I don't beieve there was any compromise made in choosing tridoe operation. It is one of the best sounding amplifiers I have ever heard. I suspect that design and implementation may count for more than design topography.
Tvad ; as I stated in my first response , "Sales hype or not ? I don't know ." Please report here , or p.m. me , with the results of your research . It could be quite informative , in more ways than one ! Thank you .
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.
