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In the Forum: Melquiades Amplifier
In the Thread: Do the Filament Transformers Require a Center Tap?
Post Subject: Do not do it.Posted by Romy the Cat on: 10/9/2017
Iraschwips, I do not think that it has anything
to do with impedance at all. You might have sub 1R impedance of your
loudspeakers and perfectly compensate it by wiring a custom transformer that
will perfectly work against lower impedances. I would not use Milq for anything
with lower sensitivity then 100Db, perhaps very high of 90s in case you have a
very small room. It is not even about gain or power but some sort of energetic
or sort of “enthusiasm” that you will not have with low powered SET and low
sensitivity drive. There are panty of other options for low sensitivity
acoustic systems. I do feel that if you like the sound of 300B with 92-94db then you need to listen more… or louder... Do not also
forget the 300B is DHT tube and if you have enough current on the driving stage
then the tube might be driven to the right side of graph and work with grid currents.
Better of worse but all DHT will do it and this is what they are OK in A2 and
they do very soft clipping. Some of them do not clip at all and will run like crazy
until the driver stage has a current clip. The 6C33C is very different beast.
It is IDHT and it absolutely not able to enter right side of graph and as soon
the swing of the grid voltage approach the bias then tube is super hard clipping,
producing horrible bass and generating very hard UHF harmonics that damage you twitters,
lower IQ of your kids, fade your wife cactuses and make stupid audio reviewers
to experience multiple orgasm during listening. So, do not experiment with indirectly
heated triodes and low sensitivity acoustic system.Rerurn to Romy the Cat's Site