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Old 3rd September 2012, 11:58 PM   #12591
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i cant see how this can classify as a turbo V1?
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Old 4th September 2012, 06:28 AM   #12592
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Audio san,
Some differences with standard F5:
  1. parallel outputs
  2. feedback lowered to get 21 dB
  3. I must say I still have to add the P3
  4. I am tempted to try the C3/C4 of V3
And these outputs I have allow use without a source resistor (inherently temperature stable), so in a next step, omitting them, gives V2 ("What if you remove the Source resistance altogether?").

I must say i like the improvement in resolution and authority.
albert
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Old 12th September 2012, 06:32 AM   #12593
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maybe a silly question, but:

what is the "better" load for the F5 amp?

- 4 Ohm
- 8 Ohm

I know it can drive both loads without problems, but I'm going to build the next pairs of speakers, and so I have to take a decision...
I thought it is more powerful in 4 Ohms, but I'm not 100% sure...

Thanks&Regards,
Matthias
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Old 12th September 2012, 09:29 AM   #12594
AndrewT is offline AndrewT  Scotland
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8ohms

I take that back.
Possibly 16ohms !
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Old 12th September 2012, 06:58 PM   #12595
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just my 2 cents I notice a bass and loudness with STD F5 in 8 ohm and much better with F5c for 4 ohm, cleaner bass and a little more punch, Than std f5,and less heat on sinks.
NS
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Old 14th September 2012, 02:43 PM   #12596
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Thanks guys!

hmmmm, my problem is no more place inside my enclosures, so using the shop's F5c boards is no option...

So I'm going to build a three way speaker with 8 Ohms, I think. Maybe this one:
BlueNote | Lautsprecherbau

Regards,
Matthias
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Old 14th September 2012, 03:36 PM   #12597
Rush is offline Rush  United States
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Quote:
Originally Posted by GentryBa View Post
Thanks guys!

hmmmm, my problem is no more place inside my enclosures, so using the shop's F5c boards is no option...

So I'm going to build a three way speaker with 8 Ohms, I think. Maybe this one:
BlueNote | Lautsprecherbau

Regards,
Matthias
The tweeter is 4 ohms, the other speakers seem to be 8 ohm-ish. Also the system is only 87/88 dbSPL. I would look for a more efficient speaker system in the 90 + range. I use Snell E2, bi-amped (2 way). They work well and Audio Note has E2 kits with various drivers according to your price point. Lots of other ones out there.

Rush
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Old 5th October 2012, 11:09 AM   #12598
jpedro is offline jpedro  Portugal
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Finally I concluded my F5.
It was an extremely interesting project from the standpoint constructive. It was fundamental support and technical advice from Carlomar.
Now I can enjoy delight, the sound of this amp, Project Engineer Mr. Nelson Pass, a big name in high fidelity and has done much for DIY.
As for the sound, I can tell you that I am generally delighted with the sound of this amp. Especially appreciate your detail. I love jazz, instrumental and vocal, and this amplifier reproduces very well either voices like the metals. Gives the feeling of the artist being there, in our presence, in our living room.
I'm on the lookout to start building the preamp, also Project Engineer Nelson Pass, and that will "marry" the F5.
I enclose some photos of F5.
My special thanks to Mr. Nelson Pass.
My thanks to members of the forum to give their input, in particular:
Carlomar, formula 22, Alazira, Lanchile, Jameshillj, CeeVee, Blues, Peter Daniel

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 5th October 2012, 11:18 AM   #12599
beetle is offline beetle  Germany
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Looks good. Well done!
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Old 5th October 2012, 01:43 PM   #12600
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That is a very attractive case you designed.
There is something about the simplicity and proportions that is very appealing.
Enjoy!
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