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Old 7th February 2012, 10:20 PM   #11
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The Article is very exciting

Thank you very much Nelson
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Old 7th February 2012, 10:21 PM   #12
Variac is offline Variac  United States
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F-5 Turbo: It's not an amp, its a book!

I predict a run on the F-5c boards in the store!

Last edited by Variac; 7th February 2012 at 10:34 PM.
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Old 7th February 2012, 10:24 PM   #13
fdlsys is offline fdlsys  South Africa
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Bah. Only one supplier 'round here has the P-channel, no one has the N-channel devices
Any consequences using the 240/9240 instead?

BTW: What a read! Like, the latest thriller novel just released, except you need to build one to see how it ends!
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Old 7th February 2012, 10:24 PM   #14
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by CeeVee View Post
............can´t wait to hear this one singing.

I can't tell that entire article is revelation to me ( from several reasons ) , but I can tell that devil is in diode detail ......

so - I'm Happy ZM Camper

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Old 7th February 2012, 10:28 PM   #15
JZatopa is offline JZatopa  United States
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Mr. Pass thanks again for sharing your skills and knowledge with the world. I hope to one day share my own expertise with the world in the same way. I just have to build my career first, so I can afford to share a bit more.

I think it's great that you created a paper for all the guys on here who love the F5 but would like more power. Personally, I am using my stock F5 on my 2ohm 96db/watt/meter speakers and love it. I don't need more power but it is nice to see that you listen to what the community wants, even if it is different then the original goal of the amp.

I can't wait to see the size of the v3 amps that I am sure the guys on this site will build.
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Old 7th February 2012, 10:37 PM   #16
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by Zen Mod View Post
I can't tell that entire article is revelation to me ( from several reasons ) , but I can tell that devil is in diode detail ......

so - I'm Happy ZM Camper

..'course you would have discussed it with Papa in your stay overthere...

No source resistors make me think of those lovely and expensive Japanese amps....
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Old 7th February 2012, 10:45 PM   #17
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by CeeVee View Post
..'course you would have discussed it with Papa in your stay overthere...

....
believe me , we didn't ; I'm always trying to have some life outside electronic , so I bugged Pa with some other things and - when electronic was in question , I had some different questions ; ( did I understood answers or not , that's another issue )

Quote:
Originally Posted by CeeVee View Post
...
No source resistors make me think of those lovely and expensive Japanese amps....

yup - lovely and expensive ; many of them are just that
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Old 7th February 2012, 10:59 PM   #18
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Juppie 2 times crimbo

Tanks Papa
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Old 7th February 2012, 11:13 PM   #19
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Quote:
Originally Posted by fdlsys View Post
Any consequences using the 240/9240 instead?
The shift to the Fairchilds was to get lower distortion numbers. The IR
parts will work, but the 9240 has more distortion, which has never stopped
me from using it.

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Old 7th February 2012, 11:30 PM   #20
ra7 is offline ra7  United States
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I'm sure this has been covered in this gigantic thread before, but how do you calculate the power in class A?

For example, in F5T V1, with +-32V rails, and 1.0 amp per device, with two pairs per channel, giving a bias of 4 amps per channel.
P = I^2 x R = 4^2 x 8 = 128W peak.

From the original F5 manual, average would be 64W and this would be the power in class A. Correct?
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