F5 Listening Impressions & Discussion - Page 30

Peter Daniel · 8th February 2010, 10:09 PM

All resistors have some sonic signature, nude Vishays just seem to have it on a nicer side; I could say least "color or warmth"

labjr · 8th February 2010, 10:19 PM

Quote:

Originally Posted by Peter Daniel

I also didn't find much difference switching from a single supply to dual mono.

Peter, which transformer did you use? The 300VA Plitron?

Peter Daniel · 8th February 2010, 10:24 PM

Yes, 300VA Plitron with 50,000uF total capacitance in stereo or per monoblock.

labjr · 8th February 2010, 10:41 PM

Quote:

Originally Posted by Peter Daniel

Yes, 300VA Plitron with 50,000uF total capacitance in stereo or per monoblock.

Did it run hot or have any mechanical buzz in stereo? Also did you use separate bridges and capacitors for each channel?

Thanks

hags · 8th February 2010, 10:42 PM

Isn't 300VA slightly underrated for stereo use?

labjr · 8th February 2010, 10:48 PM

Quote:

Originally Posted by hags

Isn't 300VA slightly underrated for stereo use?

You'd think so but that's what Nelson uses.

Peter Daniel · 8th February 2010, 10:50 PM

Didn't notice any unusual behavior, bridges and caps were shared.

Andersonix · 8th February 2010, 11:17 PM

Quote:

Originally Posted by vdi_nenna

The second F5 did not kill the first version. Was it worth upgrading parts, yes it was.

Are you sure about your conclusion? Could it be that the current limiting circuit is too limiting (as this was one of the differences between the two amps), as has been alluded to by people who seem to know. Does it need to be re-calculated?

tinitus · 8th February 2010, 11:25 PM

In F5 manual Nelson states 1-2ohm, no problem

If 1-2ohm also means very high sensitivity speakers, no problem

If its low sensitivity speakers, maybe not so good fore any other than moderate SPL

Moderate SPL, which might still be ok fore what I would call "tactile" speakers
Well balanced speakers need not be very loud to SOUND right

I will soon present some ideas fore the Wild Burro 8"
2ways and 3ways in several variations, using the same basic box
If I manage to build F5 amp, it will be used fore devellopment, and they may become a good match

labjr · 8th February 2010, 11:37 PM

Quote:

Originally Posted by Tosh

Are you sure about your conclusion? Could it be that the current limiting circuit is too limiting (as this was one of the differences between the two amps), as has been alluded to by people who seem to know. Does it need to be re-calculated?

Well peter didn't hear much difference. If I recall he eliminated the current limiting when he first built the mono F5's. So I'm guessing that is the difference.

As far as recalculating the current limiting. I can't imagine the master made a mistake. The F5 has only two output devices and probably had to be protected from destruction by a retail buyer or unexperienced builder.

8th February 2010, 10:09 PM	#291
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	All resistors have some sonic signature, nude Vishays just seem to have it on a nicer side; I could say least "color or warmth" __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

8th February 2010, 10:24 PM	#293
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Yes, 300VA Plitron with 50,000uF total capacitance in stereo or per monoblock. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

8th February 2010, 10:42 PM	#295
hags diyAudio Member Join Date: Nov 2004 Location: Chain o' Lakes	Isn't 300VA slightly underrated for stereo use? __________________ "Some lures are designed to catch fish, others are designed to catch fisherman."

8th February 2010, 10:50 PM	#297
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Didn't notice any unusual behavior, bridges and caps were shared. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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8th February 2010, 11:25 PM	#299
tinitus diyAudio Moderator Join Date: Nov 2005	In F5 manual Nelson states 1-2ohm, no problem If 1-2ohm also means very high sensitivity speakers, no problem If its low sensitivity speakers, maybe not so good fore any other than moderate SPL Moderate SPL, which might still be ok fore what I would call "tactile" speakers Well balanced speakers need not be very loud to SOUND right I will soon present some ideas fore the Wild Burro 8" 2ways and 3ways in several variations, using the same basic box If I manage to build F5 amp, it will be used fore devellopment, and they may become a good match

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