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Old 18th May 2015, 02:39 PM   #1
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Location: San Juan, Madrid
Default F4 Turbo

Read the articles on the F5 turbo. NP mentions that by only repacing the transformer to a 24v one the output of the F5 is increased. would this apply to the F4?

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Old 18th May 2015, 03:50 PM   #2
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Join Date: Jun 2007
The F4 is different sort of amplifier and I am not sure it makes sense to make it a "turbo"
Why not explain to us what it is that you are trying to accomplish? There may be alternatives.
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Old 18th May 2015, 06:44 PM   #3
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Join Date: Mar 2006
Location: San Juan, Madrid
I drive a pair of Quad 988's with my F4 in a small room of course. Got to listem to them with a Quad 909 amp. Over the week end a nd liked what mor power or control could do. Was wondering about having a little more control with the refinement of a first watt. I guess that the most prectical solution would be to get another F4.
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Old 19th May 2015, 02:27 AM   #4
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Join Date: Mar 2003
Location: midwest
What are you using as preamp?
Pass B-1 preamp, Pass F-5 Amp, Pass F-6 Amp, Pass BA-3 Preamp, Pass BA-3 Amp, Pass M-2 amp, Pass Pearl 2 Phono
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Old 21st May 2015, 06:00 PM   #5
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The problems are two:

1) This presumes that you have a source which will swing the higher

2) The input JFETs are near their voltage limit, so you can't really go much
higher with supply.

Of course you can bypass the input JFETs - they aren't that necessary if
you have a low impedance source.

Also, recall that you can run this balanced, which will get you into the
100 watt region.

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Old 21st May 2015, 08:19 PM   #6
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Join Date: Mar 2006
Location: San Juan, Madrid
Default How about replacing the 300va 18v transformer

to an Antek 600VA 18v 18v one. According to Allen Wright in his book he mentions the improvement that a higher VA rated transformer would provide.


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