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Romy the Cat
Boston, MA
Posts 10,166
Joined on 05-28-2004
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Post #:
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43
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Post ID:
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24570
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Reply to:
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24569
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 S.yorke wrote: | | Dear Romy,What would be your suggestion on the
operating point and OPT impendance if I were to drive a single driver Back
loaded horn speaker with over 102db/W? Knowing that you have mentioned a range
of operating points in the forum, I still not too sure what would best for my
setup. Thanks in advanced. |
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S.yorke,
The operation point is simple
to recommend, the OPT impedance is more complicated subject. The 6C33C is kind
of current-loving type of tube. I run it at a little below 200V and as much current
as I need. With bass channel when I need
as much power as I can get I use 275mA-190mA that made it sub 60W plate dissipation.
Usually 55W on plate is max that I tend to drive the tube, not that you cannot
go high if you need. Be advised that higher plate dissipation lower the plate output
impedance, so you might factor it in. With all other things equal and regardless
the specific demands of a given speaker I feel that the best is to drive 6C33C
(if you use both filaments) with 47-53W. Note that specific configuration of current
vs voltage is not too critical and might be easily offset by OPT ratio. You can
use anything between 160V and 220V, and the current accordingly, that all will
be fine.
The OPT impedance is a
very complex question, not so “complex” but rather the answer is very much deepens
from the acoustic system you use, your loading objectives, type of the sound
you need, your operation point, the way how you integrate you speaker into the
room, your personal, preferences, type and design of OPT you use and many other
factors. I personally use a fully heated 6C33C logins it from 400R to 1400R and
this is a huge margin. So I will stay away from any specific loading reconditions,
not he last fact is that I do not know those “yellow drivers” and what they need
to sound appropriate.
"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
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