F5 Turbo Builders Thread - Page 126

buzzforb · 4th February 2013, 01:55 AM

I didnt realize how blurry it was. The blue is loopback showing soundcard distortion and the red is the distortion of the F5T at 1W. Its a breakdown of the harmonic structure of the distortion. Like I said, I am not 100% sure of its validity, but i think it is right. My ears seem to agree

6L6 · 4th February 2013, 01:57 AM

You like it? I'm currently building mine...

buzzforb · 4th February 2013, 02:15 AM

Yes. It is very good from top to bottom. I cant say that it is my favorite, but that is yet to be decided. I have to bring forth proper competition. I did not like the F5, and hearing the F5T has sold me on the multiple output concept. Of course my system has to be considered.

Marra · 4th February 2013, 12:28 PM

I decided to check out my p/s so hooked up the transformer/rectifiers and caps which loaded with nothing more than 3k3 bleed resistors and a couple of led's is giving me +- 38V dc.What sort of voltage drop can I expect with a V2 amp?
The transformer is 350VA with 25-0-25 secondaries.

Odysseas · 4th February 2013, 01:11 PM

You should be careful with 38V. It's not extreme, but it is risky.
What do you mean <<What sort of voltage drop can I expect with a V2 amp?>>?

buzzforb · 4th February 2013, 01:16 PM

multiply your secondary times 1.3 for a good approximation. 38v is fine as long as you you the cascaded version, but iexpect your rail to be closer to around 34V loaded. 350VA is going to be strugglinf under fully biased V2 unless your have dual mono setup.

henryve · 4th February 2013, 01:53 PM

To be honest I would not use anything less that 650VA for the V2. Even better would be 2 X 500VA for a dual mono setup.

For a V3 I would definitely suggest monoblocks, with a 750VA as minimum per monoblock and 1000VA as a comfortable requirement.

henryve · 4th February 2013, 02:00 PM

BTW, it would be interesting to compare the V2 with my KSA50 clone. Both of these should be good at the bottom. The top is where I believe the V2 could be better.

buzzforb · 4th February 2013, 02:00 PM

I would be willing to bet it will crush it sonically.

Marra · 4th February 2013, 02:15 PM

Sorry I should have said this is per channel.I used the transformers previously to power an Aleph 5 without any problems and the voltages sat at +-34/35 volts.It will be cascoded. I am rubbish with the math

4th February 2013, 01:55 AM	#1251
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	I didnt realize how blurry it was. The blue is loopback showing soundcard distortion and the red is the distortion of the F5T at 1W. Its a breakdown of the harmonic structure of the distortion. Like I said, I am not 100% sure of its validity, but i think it is right. My ears seem to agree __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!

4th February 2013, 01:57 AM	#1252
6L6 diyAudio Member Join Date: Oct 2010 Location: Denver, Colorado	You like it? I'm currently building mine... __________________ llustrated Build Guides - Pass Pearl 1 - Pass B1 - - Pass F5 - Pearl 2 - -O2 HPA - - Pass F4

4th February 2013, 02:15 AM	#1253
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Yes. It is very good from top to bottom. I cant say that it is my favorite, but that is yet to be decided. I have to bring forth proper competition. I did not like the F5, and hearing the F5T has sold me on the multiple output concept. Of course my system has to be considered. __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!

4th February 2013, 01:16 PM	#1256
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	multiply your secondary times 1.3 for a good approximation. 38v is fine as long as you you the cascaded version, but iexpect your rail to be closer to around 34V loaded. 350VA is going to be strugglinf under fully biased V2 unless your have dual mono setup. __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!

4th February 2013, 02:00 PM	#1259
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	I would be willing to bet it will crush it sonically. __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!


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4th February 2013, 12:28 PM	#1254
Marra diyAudio Member Join Date: Nov 2009 Location: Near Lincoln	I decided to check out my p/s so hooked up the transformer/rectifiers and caps which loaded with nothing more than 3k3 bleed resistors and a couple of led's is giving me +- 38V dc.What sort of voltage drop can I expect with a V2 amp? The transformer is 350VA with 25-0-25 secondaries.

4th February 2013, 01:11 PM	#1255
Odysseas diyAudio Member Join Date: Nov 2011 Location: Amsterdam	You should be careful with 38V. It's not extreme, but it is risky. What do you mean <<What sort of voltage drop can I expect with a V2 amp?>>?

4th February 2013, 01:53 PM	#1257
henryve diyAudio Member Join Date: Jun 2008 Location: Strand	To be honest I would not use anything less that 650VA for the V2. Even better would be 2 X 500VA for a dual mono setup. For a V3 I would definitely suggest monoblocks, with a 750VA as minimum per monoblock and 1000VA as a comfortable requirement.

4th February 2013, 02:00 PM	#1258
henryve diyAudio Member Join Date: Jun 2008 Location: Strand	BTW, it would be interesting to compare the V2 with my KSA50 clone. Both of these should be good at the bottom. The top is where I believe the V2 could be better.

4th February 2013, 02:15 PM	#1260
Marra diyAudio Member Join Date: Nov 2009 Location: Near Lincoln	Sorry I should have said this is per channel.I used the transformers previously to power an Aleph 5 without any problems and the voltages sat at +-34/35 volts.It will be cascoded. I am rubbish with the math

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