F5 Turbo Circuit Boards

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#2,081
dazed2 said:
I'm building the full out V3 with 4pr.
So in the case of 4pr is there benefit of running wire directly to each connection hole of the output boards? or one wire split close to the boards to the gates and O/P at the output board be ok?
Also, what would be the best way to connect the speaker out when I have 4pr (2N and 2P boards ?)
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Hi Dazed .🙂
Check this out ,maybe it will help!
NS😀
 

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#2,084
buzzforb said:
I noticed a big difference in V2 vs standard F5. I did not notice as big a difference with V3, but I think there is a simple explanation. V2 gave me all the power(headroom) my drivers needed or wanted and v3 really didn't add anything, other than DF. I would expect those who would see an improvement from V3 over V2 are those who need the extra power, like yourself. I clearly hit the ceiling in gain. THat being said. V2/V3 was a completely different animal than the F5. In your case, I would suggest multiple output pairs and less per fet bias. I am working on a f4 output board that could be easily converted to work as output to f5 Fe, if you are interested. NOt going to produce it, but I know you have a special need for power, due to your speakers. I currently have 6 pairs on the board spread out over about 16", using universal mounting spec.
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Perhaps the biggest difference was due to the rail voltage? Whether you use a V3 or V2 is subtle, but the difference from a 20 volt rail to a 50 volt rail will not be.
 
#2,085
What would your reasoning be? Greater voltage swing/dynamic headroom? Not arguing, just wondering/learning. Seems balance is way to go if you want voltage headroom. My v2/3 attempts used same rail voltage as standard F5.
 
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#2,088
buzzforb said:
What would your reasoning be? Greater voltage swing/dynamic headroom? Not arguing, just wondering/learning. Seems balance is way to go if you want voltage headroom. My v2/3 attempts used same rail voltage as standard F5.
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I don't have the answers, just more questions...

Energy in the power supply is proportional to the square of the voltage. I've always found that the higher voltage rails sound more "effortless". Perhaps there is a relationship? Maybe rail voltage droop does not sound so severe when you start with a lot of voltage?

Sorry for the subjective...

I always assumed your F5T had higher voltages. Now I'm really excited to build it!
 
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