DIY progress report - Page 212

R-K Rønningstad · 22nd September 2009, 11:02 PM

Seems the IRF240 for example and the 2SK82 is not that different, the MOSFET can handle more current than the VFET, but Pd is quite similar (VFET at 95W vs MOSFET at 125W).
So that Sony VFET pair ain't wimps either.
Ergo some quite sturdy power amps should be possible with a few VFETs.
But of course the design should be bullet proof with belts and suspenders, as replacements for a wrecked amp might not be available in 2012 or so!
(Or can someone persuade these southern men to make p-channels as well?)

RK

ljfont · 26th October 2009, 07:36 PM

Quote:

Originally Posted by Nelson Pass

Here's one of the 10 B4 prototypes that went out for industry
evaluation.

Is the Full Range High Pass filter a buffered phase coherent crossover network?

Nelson Pass · 26th October 2009, 08:15 PM

One prototype was. The ten I referred to were simply
adjustable Sallen-Key filters 6 or 12 dB/oct with independently
adjustable poles and unity gain buffer.

vdi_nenna · 8th February 2010, 07:26 PM

Hi Nelson,

Any word on an Open Baffle design? There were some rumors of such a project floating round. Is it true?

Thanks,

Vince

Nelson Pass · 8th February 2010, 11:50 PM

Yes, it's a real project, although it's gotten kind of large.

It has made it to the front burner. I imagine that actual
writing will commence at Sea Ranch later this month.

vdi_nenna · 9th February 2010, 12:15 AM

Nice! Thanks for the update. Enjoy the get-a-way!

vdi_nenna · 13th April 2010, 08:07 PM

Heard an OB for the first time a couple of weekends ago. It was a 12" 100+ db P-Audio driver with 4" concentric tweeter; driven by my F5 and BOSOZ. I was surprised by the low end and how tight it was.

Looking forward to seeing what you have up your sleeve, Mr Pass.

Nelson Pass · 9th August 2010, 08:31 PM

I have neglected this thread for a while, but that will change
shortly, so gird your grids...

jackinnj · 9th August 2010, 10:36 PM

Quote:

Originally Posted by Nelson Pass

I have neglected this thread for a while, but that will change
shortly, so gird your grids...

or grab your loin, as the case may be...

jameshillj · 10th August 2010, 02:19 AM

... a higher powered F3, perhaps?

8th February 2010, 07:26 PM	#2114
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Open Baffle Design Hi Nelson, Any word on an Open Baffle design? There were some rumors of such a project floating round. Is it true? Thanks, Vince __________________ Zen, BOZ, BOZ-J, BLS, B1, Mini-A, Audio Sector NOS DAC, Gain Clone, F5, CAT5 Speaker Cable, DIY Allen Wright ICs, MOX II

9th February 2010, 12:15 AM	#2116
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Nice! Thanks for the update. Enjoy the get-a-way! __________________ Zen, BOZ, BOZ-J, BLS, B1, Mini-A, Audio Sector NOS DAC, Gain Clone, F5, CAT5 Speaker Cable, DIY Allen Wright ICs, MOX II

13th April 2010, 08:07 PM	#2117
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Heard an OB for the first time a couple of weekends ago. It was a 12" 100+ db P-Audio driver with 4" concentric tweeter; driven by my F5 and BOSOZ. I was surprised by the low end and how tight it was. Looking forward to seeing what you have up your sleeve, Mr Pass. __________________ Zen, BOZ, BOZ-J, BLS, B1, Mini-A, Audio Sector NOS DAC, Gain Clone, F5, CAT5 Speaker Cable, DIY Allen Wright ICs, MOX II

10th August 2010, 02:19 AM	#2120
jameshillj diyAudio Member Join Date: Feb 2005 Location: Melbourne, Aust	... a higher powered F3, perhaps? __________________ ... jh

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22nd September 2009, 11:02 PM	#2111
R-K Rønningstad diyAudio Member Join Date: Jan 2006 Location: Oslo	Seems the IRF240 for example and the 2SK82 is not that different, the MOSFET can handle more current than the VFET, but Pd is quite similar (VFET at 95W vs MOSFET at 125W). So that Sony VFET pair ain't wimps either. Ergo some quite sturdy power amps should be possible with a few VFETs. But of course the design should be bullet proof with belts and suspenders, as replacements for a wrecked amp might not be available in 2012 or so! (Or can someone persuade these southern men to make p-channels as well?) RK

26th October 2009, 08:15 PM	#2113
Nelson Pass The one and only Join Date: Mar 2001	One prototype was. The ten I referred to were simply adjustable Sallen-Key filters 6 or 12 dB/oct with independently adjustable poles and unity gain buffer.

8th February 2010, 11:50 PM	#2115
Nelson Pass The one and only Join Date: Mar 2001	Yes, it's a real project, although it's gotten kind of large. It has made it to the front burner. I imagine that actual writing will commence at Sea Ranch later this month.

9th August 2010, 08:31 PM	#2118
Nelson Pass The one and only Join Date: Mar 2001	I have neglected this thread for a while, but that will change shortly, so gird your grids...

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