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F5T with 56V rails?
F5T with 56V rails?
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Old 9th July 2013, 06:57 PM   #31
bear is offline bear
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F5T with 56V rails?
Buzzforb, he already has the PS iron, so he is trying to use it.

My suggestion was to use choke input...

http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- every once in a while I say something that makes sense... ]
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Old 9th July 2013, 07:12 PM   #32
buzzforb is offline buzzforb  United States
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Sorry. missed that part. Of course it can still be done. Duncan Amps PSUD II would be a worthwhile download, i believe, for the PSU and then it is a matter of cascoding the Fe and increasing Rs on the output.
...Shape the sound , Man!
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Old 10th July 2013, 07:53 AM   #33
AndrewT is offline AndrewT  Scotland
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Originally Posted by buzzforb View Post
.............. apporopriate voltage needed to have the diodes near turn on. .............
I have previously explained that there are different ways to use these diodes for enhanced current ability (= less voltage droop at high output).

You do not NEED "to have the diodes near turn on".
regards Andrew T.
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Old 10th July 2013, 06:43 PM   #34
Leify is offline Leify  Sweden
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I have just ordered another set of boards so I can build a F5T V3 with 4 pairs of mosfets per channel. Then should the problem be solved. I should have no problem to have +-52V rails and to set the bias for around 30W class A and the remaining in class AB. Then I don't need monster heatsinks as well I guess. My intention is to build monoblocks with 2.2 KVA tr and about 0.5 F per channel. Should be a very nice amp.


Last edited by Leify; 10th July 2013 at 06:45 PM.
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Old 10th July 2013, 07:06 PM   #35
AudioSan is offline AudioSan  Norway
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you will stil need some semi monster sinks 52V and 1.4A bias = 145W dissipation
but with 2.2KVA transformer, i would build a stereo amp, and save the other transformer for another project.
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Old 10th July 2013, 07:33 PM   #36
Andersonix is offline Andersonix  Sweden
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F5T with 56V rails?
Monster transformer, monster heat sinks to cool 16 mosfets (stereo), and monster cap bank? Better put it on casters, so you can move it...
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