Zorpman: I don't doubt that the Dynaco's are stable driving the load. Quite honestly, while the Dynaco's may be up to the task in terms of brute force, i'm certain that there is plenty of room to move in terms of improved sonics. I'd be curious as to what amps, if any, that you've tried on the F's other than the Dynaco's and the results that you've obtained.
Also, are you using the factory speaker cable at the base of the speaker or are you directly connecting to the binding posts at the driver ? If you are running the internal factory wiring, you are in for a REAL treat once you bypass it.
As far as the foam surround goes, it may still be quite healthy and in "perfect shape". That does not mean that it is the appropriate "stiffness" or that the driver is properly aligned. In severe cases, you may even be running into the driver binding up, resulting in limited excursion and a lack of deep bass. That is EXACTLY what i ran into on my second set of F's after a "world famous" speaker repair facility claimed to have repaired them. I then had to pay someone else to remove the fresh glue & foam and re-do the whole job. Evidently, the first shop knew that they must have screwed up as they refunded the entire amount.
My biggest problem with all of this was that these speakers spent well over a year in "limbo" due to all of these problems. Obviously, not all speaker repair facilities are up to refoaming these drivers, so be VERY careful with whom you trust the wellfare of your "babies" to. Sean
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