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In the Forum: Melquiades Amplifier
In the Thread: Building Melquiades: Chronicle of full-range
Post Subject: 50% help...Posted by Romy the Cat on: 11/20/2017
 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.  

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.

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